Abstract classes may contain abstract methods, To use an abstract class, you have to inherit it from another class, provide implementations to the abstract methods in it.

Java Programming Language Polymorphism in Java (Article) Polymorphism in Java (Program)

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Program:

abstract class Parent{
  abstract void age();
}
class Child extends Parent{
	void age(){
		System.out.println("age 22");
		}

	public static void main(String args[]){
	 Parent obj = new Child();
	 obj.age();
	}
}

  

Output:

it is b method
Press any key to continue . . .

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