what is abstract class In java with Example-program

what is abstract class In java
An abstract class is class that contaions 0 or more abstract methods.

// all the object different implementation of the method abstract class myClass
abstract class Myclass
{
   abstract void calculate(double x);
 
   }
   class Demo1 extends Myclass
   {
     void calculate(double x)
{
   System.out.println("Square="+(x*x));
 
   }
  }

class Demo2 extends Myclass{ 
      void calculate(double x){
      System.out.println("Square root="+Math.sqrt(x));
   }
}

class Demo3 extends Myclass{
   void calculate(double x){
   System.out.println("Cube="+(x*x*x));
      }
     }
 
class MainClass
{
  public static void main(String[]arr)
{
  Demo1 d1=new Demo1();
  Demo2 d2=new Demo2();
  Demo3 d3=new Demo3();
  d1.calculate(4);
  d2.calculate(5);
  d3.calculate(6);
  }
  }
  

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I'm Ethan Mariano a software engineer by profession and reader/writter by passion.I have good understanding and knowledge of AngularJS, Database, javascript, web development, digital marketing and exploring other technologies related to Software development.