Java program to create a simple abstract class

Learn how to create a simple abstract class in Java?
Submitted by Nidhi, on March 27, 2022

Problem Solution:

In this program, we will create an abstract class with an abstract method. Then we will implement the abstract method in a class by inheriting the abstract class.

Program/Source Code:

The source code to create a simple abstract class is given below. The given program is compiled and executed successfully.

// Java program to create a 
// simple abstract class

abstract class AbsClass {
  abstract void MyFun();
}

class Sample extends AbsClass {
  void MyFun() {
    System.out.println("Sample: MyFun() called");
  }
}

public class Main {
  public static void main(String[] args) {
    //Below statement will generate error because,
    //We cannot intentiate the object of AbsClass.
    //AbsClass abs = new AbsClass();
    AbsClass abs = new Sample();
    abs.MyFun();
  }
}

Output:

Sample: MyFun() called

Explanation:

In the above program, we created an abstract class AbsClass with an abstract method. Then we will inherit the AbsClass into Sample and implemented the MyFun() method.

The Main class contains a method main(). The main() method is the entry point for the program, here we created a reference of AbsClass and initialized it with the reference of Sample class and called MyFun() method.