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INHERITANCE IN JAVA.

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Inheritance in Java

Java, Inheritance is an important pillar of OOP(Object-Oriented Programming). It is the mechanism in Java by which one class is allowed to inherit the features(fields and methods) of another class. In Java, Inheritance means creating new classes based on existing ones. A class that inherits from another class can reuse the methods and fields of that class. In addition, you can add new fields and methods to your current class as well.  

Why Do We Need Java Inheritance?

  • Code Reusability: The code written in the Superclass is common to all subclasses. Child classes can directly use the parent class code.
  • Method Overriding: Method Overriding is achievable only through Inheritance. It is one of the ways by which Java achieves Run Time Polymorphism.
  • Abstraction: The concept of abstract where we do not have to provide all details, is achieved through inheritance. Abstraction only shows the functionality to the user.
Explore a free Java Course to know more about Java Inheritance.

Important Terminologies Used in Java Inheritance

  • Class: Class is a set of objects which shares common characteristics/ behavior and common properties/ attributes. Class is not a real-world entity. It is just a template or blueprint or prototype from which objects are created.
  • Super Class/Parent Class: The class whose features are inherited is known as a superclass(or a base class or a parent class).
  • Sub Class/Child Class: The class that inherits the other class is known as a subclass(or a derived class, extended class, or child class). The subclass can add its own fields and methods in addition to the superclass fields and methods.
  • Reusability: Inheritance supports the concept of “reusability”, i.e. when we want to create a new class and there is already a class that includes some of the code that we want, we can derive our new class from the existing class. By doing this, we are reusing the fields and methods of the existing class.

How to Use Inheritance in Java?

The extends keyword is used for inheritance in Java. Using the extends keyword indicates you are derived from an existing class. In other words, “extends” refers to increased functionality.

Inheritance in Java Example

Example: In the below example of inheritance, class Bicycle is a base class, class MountainBike is a derived class that extends the Bicycle class and class Test is a driver class to run the program. 

In the above program, when an object of MountainBike class is created, a copy of all methods and fields of the superclass acquires memory in this object. That is why by using the object of the subclass we can also access the members of a superclass. 

Please note that during inheritance only the object of the subclass is created, not the superclass. For more, refer to Java Object Creation of Inherited Class . 

Example 2: In the below example of inheritance, class Employee is a base class, class Engineer is a derived class that extends the Employee class and class Test is a driver class to run the program.

Illustrative image of the program: 

Inheritance in Java

In practice, inheritance, and polymorphism are used together in Java to achieve fast performance and readability of code.

Java Inheritance Types

Below are the different types of inheritance which are supported by Java.

  • Single Inheritance

Multilevel Inheritance

  • Hierarchical Inheritance

Multiple Inheritance

Hybrid Inheritance

1. Single Inheritance

In single inheritance, a sub-class is derived from only one super class. It inherits the properties and behavior of a single-parent class. Sometimes, it is also known as simple inheritance. In the below figure, ‘A’ is a parent class and ‘B’ is a child class. The class ‘B’ inherits all the properties of the class ‘A’.

Single inheritance

Single inheritance

2. Multilevel Inheritance

In Multilevel Inheritance, a derived class will be inheriting a base class, and as well as the derived class also acts as the base class for other classes. In the below image, class A serves as a base class for the derived class B, which in turn serves as a base class for the derived class C. In Java, a class cannot directly access the grandparent’s members .

Multilevel Inheritance

3. Hierarchical Inheritance

In Hierarchical Inheritance, one class serves as a superclass (base class) for more than one subclass. In the below image, class A serves as a base class for the derived classes B, C, and D.

Hierarchical-Inheritance-in-Java

4. Multiple Inheritance ( Through Interfaces)

In Multiple inheritances , one class can have more than one superclass and inherit features from all parent classes. Please note that Java does not support multiple inheritances with classes. In Java, we can achieve multiple inheritances only through Interfaces . In the image below, Class C is derived from interfaces A and B.

Multiple Inheritance

5. Hybrid Inheritance

It is a mix of two or more of the above types of inheritance. Since Java doesn’t support multiple inheritances with classes, hybrid inheritance involving multiple inheritance is also not possible with classes. In Java, we can achieve hybrid inheritance only through Interfaces if we want to involve multiple inheritance to implement Hybrid inheritance. However, it is important to note that Hybrid inheritance does not necessarily require the use of Multiple Inheritance exclusively. It can be achieved through a combination of Multilevel Inheritance and Hierarchical Inheritance with classes, Hierarchical and Single Inheritance with classes. Therefore, it is indeed possible to implement Hybrid inheritance using classes alone, without relying on multiple inheritance type. 

Hybrid Inheritance

Java IS-A type of Relationship

IS-A is a way of saying: This object is a type of that object. Let us see how the extends keyword is used to achieve inheritance.

Now, based on the above example, in Object-Oriented terms, the following are true:-

  • SolarSystem is the superclass of Earth class.
  • SolarSystem is the superclass of Mars class.
  • Earth and Mars are subclasses of SolarSystem class.
  • Moon is the subclass of both Earth and SolarSystem classes.

What Can Be Done in a Subclass?

In sub-classes we can inherit members as is, replace them, hide them, or supplement them with new members: 

  • The inherited fields can be used directly, just like any other fields.
  • We can declare new fields in the subclass that are not in the superclass.
  • The inherited methods can be used directly as they are.
  • We can write a new instance method in the subclass that has the same signature as the one in the superclass, thus overriding it (as in the example above, toString() method is overridden).
  • We can write a new static method in the subclass that has the same signature as the one in the superclass, thus hiding it.
  • We can declare new methods in the subclass that are not in the superclass.
  • We can write a subclass constructor that invokes the constructor of the superclass, either implicitly or by using the keyword super .

 Advantages Of Inheritance in Java:

  • Code Reusability: Inheritance allows for code reuse and reduces the amount of code that needs to be written. The subclass can reuse the properties and methods of the superclass, reducing duplication of code.
  • Abstraction: Inheritance allows for the creation of abstract classes that define a common interface for a group of related classes. This promotes abstraction and encapsulation, making the code easier to maintain and extend.
  • Class Hierarchy: Inheritance allows for the creation of a class hierarchy, which can be used to model real-world objects and their relationships.
  • Polymorphism: Inheritance allows for polymorphism, which is the ability of an object to take on multiple forms. Subclasses can override the methods of the superclass, which allows them to change their behavior in different ways.

Disadvantages of Inheritance in Java:

  • Complexity: Inheritance can make the code more complex and harder to understand. This is especially true if the inheritance hierarchy is deep or if multiple inheritances is used.
  • Tight Coupling: Inheritance creates a tight coupling between the superclass and subclass, making it difficult to make changes to the superclass without affecting the subclass.

Let us check some important points from the article are mentioned below:

  • Default superclass : Except Object class, which has no superclass, every class has one and only one direct superclass (single inheritance). In the absence of any other explicit superclass, every class is implicitly a subclass of the Object class.
  • Superclass can only be one: A superclass can have any number of subclasses. But a subclass can have only one superclass. This is because Java does not support multiple inheritances with classes. Although with interfaces, multiple inheritances are supported by Java.
  • Inheriting Constructors: A subclass inherits all the members (fields, methods, and nested classes) from its superclass. Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.
  • Private member inheritance: A subclass does not inherit the private members of its parent class. However, if the superclass has public or protected methods(like getters and setters) for accessing its private fields, these can also be used by the subclass.

FAQs in Inheritance

1. what is inheritance java.

Inheritance is a concept of OOPs where one class inherits from another class that can reuse the methods and fields of the parent class.

2. What are the 4 types of inheritance in Java?

There are Single, Multiple, Multilevel, Hierarchical and Hybrid

3. What is the use of extend keyword?

Extend keyword is used for inheriting one class into another.

4. What is an example of inheritance in Java?

A real-world example of Inheritance in Java is mentioned below:

Consider a group of vehicles. You need to create classes for Bus, Car, and Truck. The methods fuelAmount(), capacity(), applyBrakes() will be the same for all three classes.
References Used: “Head First Java” by Kathy Sierra and Bert Bates “Java: A Beginner’s Guide” by Herbert Schildt “Java: The Complete Reference” by Herbert Schildt “Effective Java” by Joshua Bloch “Java: The Good Parts” by Jim Waldo.

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Guide to Inheritance in Java

Last updated: March 17, 2024

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1. Overview

One of the core principles of Object-Oriented Programming – inheritance – enables us to reuse existing code or extend an existing type.

Simply put, in Java, a class can inherit another class and multiple interfaces, while an interface can inherit other interfaces.

In this article, we’ll start with the need for inheritance, moving to how inheritance works with classes and interfaces.

Then, we’ll cover how the variable/ method names and access modifiers affect the members that are inherited.

And at the end, we’ll see what it means to inherit a type.

2. The Need for Inheritance

Imagine, as a car manufacturer, you offer multiple car models to your customers. Even though different car models might offer different features like a sunroof or bulletproof windows, they would all include common components and features, like engine and wheels.

It makes sense to create a basic design and extend it to create their specialized versions, rather than designing each car model separately, from scratch.

In a similar manner, with inheritance, we can create a class with basic features and behavior and create its specialized versions, by creating classes, that inherit this base class. In the same way, interfaces can extend existing interfaces.

We’ll notice the use of multiple terms to refer to a type which is inherited by another type, specifically:

  • a base type is also called a super or a parent type
  • a derived type is referred to as an extended, sub or a child type

3. Class Inheritance

3.1. extending a class.

A class can inherit another class and define additional members.

Let’s start by defining a base class Car :

The class ArmoredCar can inherit the members of Car class by using the keyword extends in its declaration :

We can now say that the ArmoredCar class is a subclass of Car, and the latter is a superclass of ArmoredCar.

Classes in Java support single inheritance ; the ArmoredCar class can’t extend multiple classes.

Also, note that in the absence of an extends keyword, a class implicitly inherits class java.lang.Object .

A subclass class inherits the non-static protected and public members from the superclass class.  In addition, the members with default ( package-private) access are inherited if the two classes are in the same package.

On the other hand, the private  and  static members of a class are not inherited.

3.2. Accessing Parent Members from a Child Class

To access inherited properties or methods, we can simply use them directly:

Note that we don’t need a reference to the superclass to access its members.

4. Interface Inheritance

4.1. implementing multiple interfaces.

Although classes can inherit only one class, they can implement multiple interfaces.

Imagine the ArmoredCar that we defined in the preceding section is required for a super spy. So the Car manufacturing company thought of adding flying and floating functionality:

In the example above, we notice the use of the keyword implements to inherit from an interface.

4.2. Issues With Multiple Inheritance

Java allows multiple inheritance using interfaces.

Until Java 7, this wasn’t an issue. Interfaces could only define abstract methods, that is, methods without any implementation. So if a class implemented multiple interfaces with the same method signature, it was not a problem. The implementing class eventually had just one method to implement.

Let’s see how this simple equation changed with the introduction of default methods in interfaces, with Java 8.

Starting with Java 8, interfaces could choose to define default implementations for its methods (an interface can still define abstract methods). This means that if a class implements multiple interfaces, which define methods with the same signature, the child class would inherit separate implementations. This sounds complex and is not allowed.

Java disallows inheritance of multiple implementations of the same methods, defined in separate interfaces.

Here’s an example:

If we do want to implement both interfaces, we’ll have to override the repair() method.

If the interfaces in the preceding examples define variables with the same name, say duration , we can’t access them without preceding the variable name with the interface name:

4.3. Interfaces Extending Other Interfaces

An interface can extend multiple interfaces. Here’s an example:

An interface inherits other interfaces by using the keyword extends . Classes use the keyword implements to inherit an interface.

5. Inheriting Type

When a class inherits another class or interfaces, apart from inheriting their members, it also inherits their type. This also applies to an interface that inherits other interfaces.

This is a very powerful concept, which allows developers to program to an interface (base class or interface) , rather than programming to their implementations.

For example, imagine a condition, where an organization maintains a list of the cars owned by its employees. Of course, all employees might own different car models. So how can we refer to different car instances? Here’s the solution:

Because all derived classes of Car inherit the type Car , the derived class instances can be referred by using a variable of class Car :

6. Hidden Class Members

6.1. hidden instance members.

What happens if both the superclass and subclass define a variable or method with the same name ? Don’t worry; we can still access both of them. However, we must make our intent clear to Java, by prefixing the variable or method with the keywords this or super .

The this keyword refers to the instance in which it’s used. The super keyword (as it seems obvious) refers to the parent class instance:

A lot of developers use this and super keywords to explicitly state which variable or method they’re referring to. However, using them with all members can make our code look cluttered.

6.2. Hidden Static Members

What happens when our base class and subclasses define static variables and methods with the same name ? Can we access a static member from the base class, in the derived class, the way we do for the instance variables?

Let’s find out using an example:

No, we can’t. The static members belong to a class and not to instances. So we can’t use the non-static super keyword in msg() .

Since static members belong to a class, we can modify the preceding call as follows:

Consider the following example, in which both the base class and derived class define a static method msg() with the same signature:

Here’s how we can call them:

For the preceding code, first.msg() will output “Car “ and second.msg() will output “ArmoredCar”. The static message that is called depends on the type of the variable used to refer to ArmoredCar instance.

7. Conclusion

In this article, we covered a core aspect of the Java language – inheritance.

We saw how Java supports single inheritance with classes and multiple inheritance with interfaces and discussed the intricacies of how the mechanism works in the language.

As always, the full source code for the examples is available over on GitHub .

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  • DriverManager
  • PreparedStatement
  • ResultSetMetaData
  • DatabaseMetaData
  • Store image
  • Retrieve image
  • Retrieve file
  • CallableStatement
  • Transaction Management
  • Batch Processing
  • RowSet Interface
  • Internationalization
  • ResourceBundle class
  • I18N with Date
  • I18N with Time
  • I18N with Number
  • I18N with Currency
  • Java Array Class
  • getBoolean()
  • getDouble()
  • getLength()
  • newInstance()
  • setBoolean()
  • setDouble()
  • Java AtomicInteger Class
  • addAndGet(int delta)
  • compareAndSet(int expect, int update)
  • decrementAndGet()
  • doubleValue()
  • floatValue()
  • getAndAdd()
  • getAndDecrement()
  • getAndSet()
  • incrementAndGet()
  • getAndIncrement()
  • lazySet(int newValue)
  • longValue()
  • set(int newValue)
  • weakCompareAndSet(int expect,int newValue)
  • Java AtomicLong Methods
  • addAndGet()
  • compareAndSet()
  • weakCompareAndSet()
  • Java Authenticator
  • getPasswordAuthentication()
  • getRequestingHost()
  • getRequestingPort()
  • getRequestingPrompt()
  • getRequestingProtocol()
  • getRequestingScheme()
  • getRequestingSite()
  • getRequestingURL()
  • getRequestorType()
  • setDefault()
  • Java BigDecimal class
  • intValueExact()
  • movePointLeft()
  • movePointRight()
  • Big Integer Class
  • bitLength()
  • compareTo()
  • divideAndRemainder()
  • getLowestSetBit()
  • isProbablePrime()
  • modInverse()
  • nextProbablePrime()
  • probablePrime()
  • shiftLeft()
  • shiftRight()
  • toByteArray()
  • Java Boolean class
  • booleanValue()
  • logicalAnd()
  • logicalOr()
  • logicalXor()
  • parseBoolean()

Java Byte Class

  • byteValue()
  • compareUnsigned()
  • parseByte()
  • shortValue()
  • toUnsignedInt()
  • toUnsignedLong()
  • asSubclass()
  • desiredAssertionStatus()
  • getAnnotatedInterfaces()
  • getAnnotatedSuperclass()
  • getAnnotation()
  • getAnnotationsByType()
  • getAnnotations()
  • getCanonicalName()
  • getClasses()
  • getClassLoader()
  • getComponentType
  • getConstructor()
  • getConstructors()
  • getDeclaredAnnotation()
  • getDeclaredAnnotationsByType()
  • getDeclaredAnnotations()
  • getDeclaredConstructor()
  • getDeclaredConstructors()
  • getDeclaredField()
  • getDeclaredFields()
  • getDeclaredMethod()
  • getDeclaredMethods()
  • getDeclaringClass()
  • getFields()
  • getGenericInterfaces()
  • getGenericSuperClass()
  • getInterfaces()
  • getMethod()
  • getMethods()
  • getModifiers()
  • getPackage()
  • getPackageName()
  • getProtectionDomain()
  • getResource()
  • getSigners()
  • getSimpleName()
  • getSuperClass()
  • isAnnotation()
  • isAnnotationPresent()
  • isAnonymousClass()
  • isInstance()
  • isInterface()
  • isPrimitive()
  • isSynthetic()
  • Java Collections class
  • asLifoQueue()
  • binarySearch()
  • checkedCollection()
  • checkedList()
  • checkedMap()
  • checkedNavigableMap()
  • checkedNavigableSet()
  • checkedQueue()
  • checkedSet()
  • checkedSortedMap()
  • checkedSortedSet()
  • emptyEnumeration()
  • emptyIterator()
  • emptyList()
  • emptyListIterator()
  • emptyNavigableMap()
  • emptyNavigableSet()
  • emptySortedMap()
  • emptySortedSet()
  • enumeration()
  • frequency()
  • indexOfSubList()
  • lastIndexOfSubList()
  • newSetFromMap()
  • replaceAll()
  • reverseOrder()
  • singleton()
  • singletonList()
  • singletonMap()
  • synchronizedCollection()
  • synchronizedList()
  • synchronizedMap()
  • synchronizedNavigableMap()
  • synchronizedNavigableSet()
  • synchronizedSet()
  • synchronizedSortedMap()
  • synchronizedSortedSet()
  • unmodifiableCollection()
  • unmodifiableList()
  • unmodifiableMap()
  • unmodifiableNavigableMap()
  • unmodifiableNavigableSet()
  • unmodifiableSet()
  • unmodifiableSortedMap()
  • unmodifiableSortedSet()

Java Compiler Class

  • Java Compiler
  • compileClass()
  • compileClasses()

CopyOnWriteArrayList

  • Java CopyOnWriteArrayList
  • lastIndexOf()

Java Math Methods

  • Math.round()
  • Math.sqrt()
  • Math.cbrt()
  • Math.signum()
  • Math.ceil()
  • Math.copySign()
  • Math.nextAfter()
  • Math.nextUp()
  • Math.nextDown()
  • Math.floor()
  • Math.floorDiv()
  • Math.random()
  • Math.rint()
  • Math.hypot()
  • Math.getExponent()
  • Math.IEEEremainder()
  • Math.addExact()
  • Math.subtractExact()
  • Math.multiplyExact()
  • Math.incrementExact()
  • Math.decrementExact()
  • Math.negateExact()
  • Math.toIntExact()
  • Math.log10()
  • Math.log1p()
  • Math.expm1()
  • Math.asin()
  • Math.acos()
  • Math.atan()
  • Math.sinh()
  • Math.cosh()
  • Math.tanh()
  • Math.toDegrees
  • Math.toRadians

LinkedBlockingDeque

  • Java LinkedBlockingDeque
  • descendingIterator()
  • offerFirst()
  • offerLast()
  • peekFirst()
  • pollFirst()
  • Java Long class

LinkedTransferQueue

  • Java LinkedTransferQueue
  • spliterator()
  • Difference between Array and ArrayList
  • When to use ArrayList and LinkedList in Java
  • Difference between ArrayList and Vector
  • How to Compare Two ArrayList in Java
  • How to reverse ArrayList in Java
  • How to make ArrayList Read Only
  • Difference between length of array and size() of ArrayList in Java
  • How to Synchronize ArrayList in Java
  • How to convert ArrayList to Array and Array to ArrayList in java
  • Array vs ArrayList in Java
  • How to Sort Java ArrayList in Descending Order
  • How to remove duplicates from ArrayList in Java
  • Java MulticastSocket
  • getInterface()
  • getLoopbackMode()
  • getNetworkInterface()
  • getTimeToLive()
  • joinGroup()
  • leaveGroup()
  • setInterface()
  • setLoopbackMode()
  • setNetworkInterface()
  • setTimeToLive()
  • Java Number Class

Java Phaser Class

  • Java Phaser
  • arriveAndAwaitAdvance()
  • arriveAndDeregister()
  • getParent()
  • awaitAdvanceInterruptibly()
  • awaitAdvance()
  • bulkRegister()
  • forceTermination()
  • getArrivedParties()
  • getRegisteredParties()
  • getUnarrivedParties()
  • isTerminated()

ArrayList Methods

  • listIterator()
  • removeRange

Java Thread Methods

  • currentThread()
  • getPriority()
  • setPriority()
  • setDaemon()
  • interrupt()
  • isinterrupted()
  • interrupted()
  • activeCount()
  • checkAccess()
  • dumpStack()
  • getStackTrace()
  • enumerate()
  • getThreadGroup()
  • notifyAll()
  • setContextClassLoader()
  • getContextClassLoader()
  • getDefaultUncaughtExceptionHandler()
  • setDefaultUncaughtExceptionHandler()

Java Projects

  • Free Java Projects
  • Payment Bill(JSP)
  • Transport (JSP)
  • Connect Globe (JSP)
  • Online Banking (JSP)
  • Online Quiz (JSP)
  • Classified (JSP)
  • Mailcasting (JSP)
  • Online Library (JSP)
  • Pharmacy (JSP)
  • Mailer (Servlet)
  • Baby Care (Servlet)
  • Chat Server (Core)
  • Library (Core)
  • Exam System (Core)
  • Java Apps (Core)
  • Fee Report (Core)
  • Fee (Servlet)
  • eLibrary (Servlet)
  • Fire Detection
  • Attendance System
  • Fibonacci Series in Java
  • Prime Number Program in Java
  • Palindrome Program in Java
  • Factorial Program in Java
  • Armstrong Number in Java
  • How to Generate Random Number in Java
  • How to Print Pattern in Java
  • How to Compare Two Objects in Java
  • How to Create Object in Java
  • How to Print ASCII Value in Java
  • How to Reverse a Number in Java
  • Java Program to convert Number to Word
  • Automorphic Number Program in Java
  • Peterson Number in Java
  • Sunny Number in Java
  • Tech Number in Java
  • Fascinating Number in Java
  • Keith Number in Java
  • Neon Number in Java
  • Spy Number in Java
  • ATM program Java
  • Autobiographical Number in Java
  • Emirp Number in Java
  • Sphenic Number in Java
  • Buzz Number Java
  • Duck Number Java
  • Evil Number Java
  • ISBN Number Java
  • Krishnamurthy Number Java
  • Bouncy Number in Java
  • Mystery Number in Java
  • Smith Number in Java
  • Strontio Number in Java
  • Xylem and Phloem Number in Java
  • nth Prime Number Java
  • Java Program to Display Alternate Prime Numbers
  • Java Program to Find Square Root of a Number Without sqrt Method
  • Java Program to Swap Two Numbers Using Bitwise Operator
  • Java Program to Find GCD of Two Numbers
  • Java Program to Find Largest of Three Numbers
  • Java Program to Find Smallest of Three Numbers Using Ternary Operator
  • Java Program to Check if a Number is Positive or Negative
  • Java Program to Check if a Given Number is Perfect Square
  • Java Program to Display Even Numbers From 1 to 100
  • Java Program to Display Odd Numbers From 1 to 100
  • Java Program to Find Sum of Natural Numbers
  • Java Program to copy all elements of one array into another array
  • Java Program to find the frequency of each element in the array
  • Java Program to left rotate the elements of an array
  • Java Program to print the duplicate elements of an array
  • Java Program to print the elements of an array
  • Java Program to print the elements of an array in reverse order
  • Java Program to print the elements of an array present on even position
  • Java Program to print the elements of an array present on odd position
  • Java Program to print the largest element in an array
  • Java Program to print the smallest element in an array
  • Java Program to print the number of elements present in an array
  • Java Program to print the sum of all the items of the array
  • Java Program to right rotate the elements of an array
  • Java Program to sort the elements of an array in ascending order
  • Java Program to sort the elements of an array in descending order
  • Java Program to Find 3rd Largest Number in an array
  • Java Program to Find 2nd Largest Number in an array
  • Java Program to Find Largest Number in an array
  • Java to Program Find 2nd Smallest Number in an array
  • Java Program to Find Smallest Number in an array
  • Java Program to Remove Duplicate Element in an array
  • Java Program to Print Odd and Even Numbers from an array
  • How to Sort an Array in Java
  • Java Matrix Programs
  • Java Program to Add Two Matrices
  • Java Program to Multiply Two Matrices
  • Java Program to subtract the two matrices
  • Java Program to determine whether two matrices are equal
  • Java Program to display the lower triangular matrix
  • Java Program to display the upper triangular matrix
  • Java Program to find the frequency of odd & even numbers in the given matrix
  • Java Program to find the product of two matrices
  • Java Program to find the sum of each row and each column of a matrix
  • Java Program to find the transpose of a given matrix
  • Java Program to determine whether a given matrix is an identity matrix
  • Java Program to determine whether a given matrix is a sparse matrix
  • Java Program to Transpose matrix
  • Java Program to count the total number of characters in a string
  • Java Program to count the total number of characters in a string 2
  • Java Program to count the total number of punctuation characters exists in a String
  • Java Program to count the total number of vowels and consonants in a string
  • Java Program to determine whether two strings are the anagram
  • Java Program to divide a string in 'N' equal parts.
  • Java Program to find all subsets of a string
  • Java Program to find the longest repeating sequence in a string
  • Java Program to find all the permutations of a string
  • Java Program to remove all the white spaces from a string
  • Java Program to replace lower-case characters with upper-case and vice-versa
  • Java Program to replace the spaces of a string with a specific character
  • Java Program to determine whether a given string is palindrome
  • Java Program to determine whether one string is a rotation of another
  • Java Program to find maximum and minimum occurring character in a string
  • Java Program to find Reverse of the string
  • Java program to find the duplicate characters in a string
  • Java program to find the duplicate words in a string
  • Java Program to find the frequency of characters
  • Java Program to find the largest and smallest word in a string
  • Java Program to find the most repeated word in a text file
  • Java Program to find the number of the words in the given text file
  • Java Program to separate the Individual Characters from a String
  • Java Program to swap two string variables without using third or temp variable.
  • Java Program to print smallest and biggest possible palindrome word in a given string
  • Reverse String in Java Word by Word
  • Reserve String without reverse() function
  • Linear Search in Java
  • Binary Search in Java
  • Bubble Sort in Java
  • Selection Sort in Java
  • Insertion Sort in Java
  • How to convert String to int in Java
  • How to convert int to String in Java
  • How to convert String to long in Java
  • How to convert long to String in Java
  • How to convert String to float in Java
  • How to convert float to String in Java
  • How to convert String to double in Java
  • How to convert double to String in Java
  • How to convert String to Date in Java
  • How to convert Date to String in Java
  • How to convert String to char in Java
  • How to convert char to String in Java
  • How to convert String to Object in Java
  • How to convert Object to String in Java
  • How to convert int to long in Java
  • How to convert long to int in Java
  • How to convert int to double in Java
  • How to convert double to int in Java
  • How to convert char to int in Java
  • How to convert int to char in Java
  • How to convert String to boolean in Java
  • How to convert boolean to String in Java
  • How to convert Date to Timestamp in Java
  • How to convert Timestamp to Date in Java
  • How to convert Binary to Decimal in Java
  • How to convert Decimal to Binary in Java
  • How to convert Hex to Decimal in Java
  • How to convert Decimal to Hex in Java
  • How to convert Octal to Decimal in Java
  • How to convert Decimal to Octal in Java
  • Java program to print the following spiral pattern on the console
  • Java program to print the following pattern
  • Java program to print the following pattern 2
  • Java program to print the following pattern 3
  • Java program to print the following pattern 4
  • Java program to print the following pattern 5
  • Java program to print the following pattern on the console
  • Java program to print the following pattern on the console 2
  • Java program to print the following pattern on the console 3
  • Java program to print the following pattern on the console 4
  • Java program to print the following pattern on the console 5
  • Java program to print the following pattern on the console 6
  • Java program to print the following pattern on the console 7
  • Java program to print the following pattern on the console 8
  • Java program to print the following pattern on the console 9
  • Java program to print the following pattern on the console 10
  • Java program to print the following pattern on the console 11
  • Java program to print the following pattern on the console 12
  • Singly linked list Examples in Java
  • Java Program to create and display a singly linked list
  • Java program to create a singly linked list of n nodes and count the number of nodes
  • Java program to create a singly linked list of n nodes and display it in reverse order
  • Java program to delete a node from the beginning of the singly linked list
  • Java program to delete a node from the middle of the singly linked list
  • Java program to delete a node from the end of the singly linked list
  • Java program to determine whether a singly linked list is the palindrome
  • Java program to find the maximum and minimum value node from a linked list
  • Java Program to insert a new node at the middle of the singly linked list
  • Java program to insert a new node at the beginning of the singly linked list
  • Java program to insert a new node at the end of the singly linked list
  • Java program to remove duplicate elements from a singly linked list
  • Java Program to search an element in a singly linked list
  • Java program to create and display a Circular Linked List
  • Java program to create a Circular Linked List of N nodes and count the number of nodes
  • Java program to create a Circular Linked List of n nodes and display it in reverse order
  • Java program to delete a node from the beginning of the Circular Linked List
  • Java program to delete a node from the end of the Circular Linked List
  • Java program to delete a node from the middle of the Circular Linked List
  • Java program to find the maximum and minimum value node from a circular linked list
  • Java program to insert a new node at the beginning of the Circular Linked List
  • Java program to insert a new node at the end of the Circular Linked List
  • Java program to insert a new node at the middle of the Circular Linked List
  • Java program to remove duplicate elements from a Circular Linked List
  • Java program to search an element in a Circular Linked List
  • Java program to sort the elements of the Circular Linked List
  • Java program to convert a given binary tree to doubly linked list
  • Java program to create a doubly linked list from a ternary tree
  • Java program to create a doubly linked list of n nodes and count the number of nodes
  • Java program to create a doubly linked list of n nodes and display it in reverse order
  • Java program to create and display a doubly linked list
  • Java program to delete a new node from the beginning of the doubly linked list
  • Java program to delete a new node from the end of the doubly linked list
  • Java program to delete a new node from the middle of the doubly linked list
  • Java program to find the maximum and minimum value node from a doubly linked list
  • Java program to insert a new node at the beginning of the Doubly Linked list
  • Java program to insert a new node at the end of the Doubly Linked List
  • Java program to insert a new node at the middle of the Doubly Linked List
  • Java program to remove duplicate elements from a Doubly Linked List
  • Java program to rotate doubly linked list by N nodes
  • Java program to search an element in a doubly linked list
  • Java program to sort the elements of the doubly linked list
  • Java Program to calculate the Difference between the Sum of the Odd Level and the Even Level Nodes of a Binary Tree
  • Java program to construct a Binary Search Tree and perform deletion and In-order traversal
  • Java program to convert Binary Tree to Binary Search Tree
  • Java program to determine whether all leaves are at same level
  • Java program to determine whether two trees are identical
  • Java program to find maximum width of a binary tree
  • Java program to find the largest element in a Binary Tree
  • Java program to find the maximum depth or height of a tree
  • Java program to find the nodes which are at the maximum distance in a Binary Tree
  • Java program to find the smallest element in a tree
  • Java program to find the sum of all the nodes of a binary tree
  • Java program to find the total number of possible Binary Search Trees with N keys
  • Java program to implement Binary Tree using the Linked List
  • Java program to search a node in a Binary Tree
  • Java Main Method
  • System.out.println()
  • Java Memory Management
  • Java ClassLoader
  • Java Decompiler
  • Java vs. JavaScript
  • Java vs. Kotlin
  • Java vs. Python
  • Java Absolute Value
  • How to Create File
  • Delete a File in Java
  • Open a File in Java
  • Sort a List in Java
  • Convert byte Array to String
  • Java Basics
  • How to Compile & Run Java Program
  • How to Run Java Program in Eclipse
  • How to Verify Java Version
  • Ways to Create an Object in Java
  • How to Run a Java program in Windows 10
  • Runnable Interface in Java
  • Java Keystore
  • Get input from user in Java
  • Read file line by line in Java
  • Take String input in Java
  • How to Read Excel File in Java
  • Read XML File in Java
  • CompletableFuture in Java
  • Java ExecutorService
  • How to iterate Map in Java
  • How to Return an Array in Java
  • How to Sort HashMap by Value
  • How to Sort HashMap in Java
  • Load Factor in HashMap
  • Array vs ArrayList
  • HashMap vs TreeMap
  • HashSet vs HashMap class
  • Compare Two ArrayList in Java
  • Merge Two Arrays in Java
  • Print Array in Java
  • Read CSV File in Java
  • Remove Special Characters from String
  • ArrayIndexOutOfBoundsException
  • ConcurrentModificationException
  • NoSuchElementException
  • NumberFormatException
  • How to Sort ArrayList in Java
  • How to Download Java
  • How to Call a Method in Java
  • How to Create Singleton Class in Java
  • How to Find Array Length in Java
  • How to Read Character in Java
  • Can We Overload main() Method in Java
  • How to Convert Char Array to String in Java
  • How to Run Java Program in CMD Using Notepad
  • How to Sort String Array in Java
  • How to Compare Dates in Java
  • How to Take Multiple String Input in Java Using Scanner
  • How to Remove Last Character from String in Java
  • How TreeMap Works Internally in Java
  • Java Program to Break Integer into Digits
  • Java Program to Calculate Area and Circumference of Circle
  • What is Diamond Problem in Java
  • Java Program to Read Number from Standard Input
  • How to Download Minecraft Java Edition
  • Can We Override Static Method in Java
  • How to Avoid Deadlock in Java
  • How to Achieve Abstraction in Java
  • How Garbage Collection Works in Java
  • How to Take Array Input in Java
  • How to Create Array of Objects in Java
  • How to Create Package in Java
  • How to Print in Java
  • What is Framework in Java
  • Why Java is Secure
  • How to Iterate List in Java
  • How to Use Eclipse for Java
  • Which Package is Imported by Default in Java
  • Could Not Find or Load Main Class in Java
  • How to Compare Two Arrays in Java
  • How to Convert String to JSON Object in Java
  • Which is Better Java or Python
  • How to Update Java
  • How to Get Value from JSON Object in Java Example
  • How to Split a String in Java with Delimiter
  • Structure of Java Program
  • Why We Use Constructor in Java
  • Java Create Excel File
  • Java Interpreter
  • javac is not Recognized
  • Dynamic Array in Java
  • Shunting yard algorithm
  • Java Destructor
  • Custom ArrayList in Java
  • ArrayList vs HashMap
  • Java Constant
  • Java Tokens
  • How to Enable Java in Chrome
  • Java Semaphore
  • Array to List in Java
  • JIT in Java
  • How to Clear Screen in Java
  • Java Logger
  • Reverse a String Using Recursion in Java
  • Java Path Vs File
  • Float Vs Double Java
  • Stack vs Heap Java
  • Abstraction vs Encapsulation
  • Top 10 Java Books
  • Public vs Private
  • What is Java Used For
  • Bitwise Operator in Java
  • SOLID Principles Java
  • Type Casting in Java
  • Conditional Operator in Java
  • Ternary Operator Java
  • Java Architecture
  • REPL in Java
  • Types of Exception in Java
  • Why String is Immutable or Final in Java
  • Java vs Kotlin
  • Set in Java
  • Why non-static variable cannot be referenced from a static context in Java
  • Java Developer Roles and Responsibilities
  • Types of Classes in Java
  • Marker Interface in Java
  • Static Function in Java
  • Unary Operators in Java
  • What is Advance Java
  • ArrayList Implementation
  • Convert ArrayList to String Array
  • Hashmap vs ConcurrentHashMap
  • List vs ArrayList
  • Map vs HashMap
  • HashSet vs LinkedHashSet
  • How TreeSet Works Internally
  • LinkedHashMap vs HashMap
  • Java Program to Solve Quadratic Equation
  • Scope Resolution Operator in Java
  • Composition in Java
  • File Operations in Java
  • NoClassDefFoundError in Java
  • Thread Concept in Java
  • Upcasting and Downcasting in Java
  • Dynamic Polymorphism in Java
  • String Pool in Java
  • What is constructor chaining in Java
  • Add elements to Array in Java
  • Advantages and disadvantages of Java
  • Advantages of JavaBeans
  • AWS SDK for Java with Apache Maven
  • AWT and Swing in Java
  • AWT Program in Java
  • Boolean values in Java
  • ByteStream Classes in Java
  • CharacterStream Classes in Java
  • Class and Interface in Java
  • ClassCast Exception in Java
  • Cloneable in Java
  • Constructor overloading in Java
  • Control Flow in Java
  • Convert Java Object to Json using GSON
  • Convert XML to JSON in Java
  • How to avoid null pointer exception in Java
  • Java constructor returns a value, but what
  • Singleton Class in Java
  • Doubly Linked List Program in Java
  • Association in Java
  • Big data Java vs Python
  • Branching Statements in Java
  • Collections Sort in Java 8
  • List vs Set in Java
  • How many days required to learn Java
  • Implicitly Typecasting in Java
  • Legacy Class in Java
  • Character Array in Java
  • Equals() and Hashcode() in Java
  • Externalization in Java
  • Identifiers in Java
  • InvocationTargetException
  • Java Pass by Value
  • Mutable and Immutable in Java
  • Power Function in Java
  • Primitive Data Types in Java
  • String Array in Java
  • Virtual Function in Java
  • C vs C++ vs Java
  • Java String Max Size
  • Convert Java object to JSON
  • How to Calculate Date Difference in Java
  • How to Improve Coding Skills in Java
  • Java Email Validation
  • Java Testing Tools
  • Permutation and Combination in Java
  • Unique Number in Java Program
  • Java Code for DES
  • Pig Latin Program in Java
  • Array Rotation in Java
  • Equilibrium Index of an Array in Java
  • Different Ways to Print Exception Message in Java
  • Java Copy Constructor Example
  • Why We Use Static Class in Java
  • What is Core Java
  • Set vs Map in Java
  • How to Create a New Folder in Java
  • Remove an Element from ArrayList in Java
  • How to Create Test Cases for Exceptions in Java
  • How to Convert JSON Array to ArrayList in Java
  • How to Create a Class File in Java
  • Java Spring Pros & Cons
  • Java Stack Trace
  • Array Slicing in Java
  • Flutter vs Java
  • Permutation of Numbers in Java
  • Magic Number in Java
  • Reference Data Types in Java
  • Counter variable in Java
  • How to take Character Input in Java using BufferedReader Class
  • Java employee details program
  • Java is case sensitive explain
  • Ramanujan Number or Taxicab Number in Java
  • Advanced Java Books in 2021
  • Fail Fast and Fail Safe Iterator in Java
  • How to build a Web Application Using Java
  • Is Java Interpreted or Compiled
  • Java Big Data Frameworks
  • Java Get Data From URL
  • No Main Manifest Attribute
  • Java missing return statement
  • Java program to remove duplicate characters from a string
  • JUnit test case example in Java
  • List of logical programs in Java
  • PermGen space Java
  • Unsigned Right Shift Operator in Java
  • Infix to Postfix Java
  • Memory Leak in Java
  • How To Write Test Cases In Java
  • Java 32-Bit Download For Windows 10
  • FizzBuzz Program in Java
  • A Java Runtime Environment JRE Or JDK Must Be Available
  • Java Does Not Open
  • No Java Virtual Machine was Found
  • Java Program Number to Word
  • Types of Garbage Collector in Java
  • No Suitable Driver Found For JDBC
  • AVL Tree program in Java
  • Fail-fast and Fail-safe in Java
  • Find unique elements in array Java
  • Highest precedence in Java
  • Java Closure
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is a mechanism in which one object acquires all the properties and behaviors of a parent object. It is an important part of (Object Oriented programming system).

The idea behind inheritance in Java is that you can create new that are built upon existing classes. When you inherit from an existing class, you can reuse methods and fields of the parent class. Moreover, you can add new methods and fields in your current class also.

Inheritance represents the which is also known as a relationship.

(so can be achieved). A class is a group of objects which have common properties. It is a template or blueprint from which objects are created. Subclass is a class which inherits the other class. It is also called a derived class, extended class, or child class. Superclass is the class from where a subclass inherits the features. It is also called a base class or a parent class. As the name specifies, reusability is a mechanism which facilitates you to reuse the fields and methods of the existing class when you create a new class. You can use the same fields and methods already defined in the previous class.

The indicates that you are making a new class that derives from an existing class. The meaning of "extends" is to increase the functionality.

In the terminology of Java, a class which is inherited is called a parent or superclass, and the new class is called child or subclass.

. It means that Programmer is a type of Employee.

In the above example, Programmer object can access the field of own class as well as of Employee class i.e. code reusability.

On the basis of class, there can be three types of inheritance in java: single, multilevel and hierarchical.

In java programming, multiple and hybrid inheritance is supported through interface only. We will learn about interfaces later.

When one class inherits multiple classes, it is known as multiple inheritance. For Example:

When a class inherits another class, it is known as a . In the example given below, Dog class inherits the Animal class, so there is the single inheritance.

File: TestInheritance.java

Output:

When there is a chain of inheritance, it is known as . As you can see in the example given below, BabyDog class inherits the Dog class which again inherits the Animal class, so there is a multilevel inheritance.

File: TestInheritance2.java

Output:

When two or more classes inherits a single class, it is known as . In the example given below, Dog and Cat classes inherits the Animal class, so there is hierarchical inheritance.

File: TestInheritance3.java

Output:

To reduce the complexity and simplify the language, multiple inheritance is not supported in java.

Consider a scenario where A, B, and C are three classes. The C class inherits A and B classes. If A and B classes have the same method and you call it from child class object, there will be ambiguity to call the method of A or B class.

Since compile-time errors are better than runtime errors, Java renders compile-time error if you inherit 2 classes. So whether you have same method or different, there will be compile time error.





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  1. Inheritance in JAVA PPT | PPT - SlideShare

    Inheritance in JAVA PPT. This document discusses inheritance in object-oriented programming. It defines inheritance as establishing a link between classes that allows sharing and accessing properties. There are three types of inheritance: single, multilevel, and hierarchical.

  2. Inheritance in java | PPT - SlideShare

    This document discusses implementation of inheritance in Java and C#. It covers key inheritance concepts like simple, multilevel, and hierarchical inheritance. It provides examples of inheritance in Java using keywords like extends, super, this.

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    Java inheritance: • The important of inheritance in java program is code reusability. We can reuse the function of parent class at child class. • In java we use Extends keyword for inheritance. • Subclass and Superclass in inheritance.

  5. PPT - Inheritance in Java PowerPoint Presentation, free ...

    This presentation on Java Inheritence will give an introduction to the inheritence concept in Java Object-Oriented Programming concepts. In this video, we will understand how to perform inheritence across Java classes using an example of mobile phones.

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    Explicitly using the super keyword. A constructor is used to construct an instance of a class. Unlike data and methods, a superclass's constructors are not inherited in the subclass. They can only be invoked from the subclasses' constructors, using the keyword super.

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    In Java, Inheritance means creating new classes based on existing ones. A class that inherits from another class can reuse the methods and fields of that class. In addition, you can add new fields and methods to your current class as well.

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  10. Chapter 06 - Inheritance in Java | PDF | Inheritance (Object ...

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