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Use Of Abstract Class In Java

Last Updated : Mar 11, 2024

Use Of Abstract Class In Java

In this article we will show you the solution of use of abstract class in java, in Java, abstract classes can implement default methods like interfaces, except that they can include default implementations of their methods.

In addition to abstract methods without bodies, abstract classes can also have abstract methods with implementations.

Classes and methods created with the abstract keyword are abstract. There is no way to instantiate Java abstract classes.

Abstract classes are used by subclasses to extend and implement abstract methods.

These methods can then be overridden or used by other classes.

Java abstract classes are created using the abstract keyword.

Abstract methods have no body and are therefore called abstract methods. The abstract is created with a keyword.

Likewise, if the methods in the class are abstract, it should be a static class, otherwise, it won't compile.

Having abstract methods is not a requirement for an abstract class.

Abstraction can be applied to classes that do not declare abstract methods.

The Java language does not support multiple class inheritance, so if an abstract class does not have a method, an interface is a better choice.

If the interface methods are static or default, then all of their methods are automatically abstract. In Java 8, interfaces now have default methods and static methods.

There is no need to implement interface methods in Java Abstract classes. They can implement interfaces without even implementing the interface itself.

In Java, abstract classes are classes that provide a default implementation of a method for all subclasses.

There are also non-abstract methods (methods that have a body in addition to abstract methods). The user only sees functionality, keeping implementation details hidden.

Additionally, the details are hidden from the user so only the essential information is displayed to them.

As an example, when you send a text message, you type the text and send it. Messages are not delivered internally, so you don't know how they are delivered.

In addition to abstract methods, non-abstract methods can also be implemented. There is a need to extend it and implement its methods.

Step By Step Guide On Use Of Abstract Class In Java :-

abstract class demo{
  abstract void run();
}
class first extends demo{
void run(){System.out.println("run demo");}
public static void main(String args[]){
 demo obj = new first();
 obj.run();
}
}
  1. First, let's create an abstract class to demonstrate the process.
  2. After declaring an extends class, we extend demo as well.
  3. After the employee's name, age, and salary are printed, we proceed with printing their information.
  4. A public static void main method is defined once the base class has been created.
  5. As a next step, we declare a new method for employees

Conclusion :-

The Java language does not support multiple class inheritance, so if an abstract class does not have a method, an interface is a better choice.

If the interface methods are static or default, then all of their methods are automatically abstract.

In Java 8, interfaces now have default methods and static methods.

I hope this article on use of abstract class in java helps you and the steps and method mentioned above are easy to follow and implement.