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Java interface example :
In this class i implement Java shape interface in the circle class .as you will see in the following example ,up-casting for the object "circleshape" .

Note :
Interface classes , functions are public and abstract ,and fields are public and final

public class Main {    
           
    public static void main(String[] args) {
       
          shape circleshape=new circle();
         
             circleshape.Draw();
    }
}

interface shape
{
     public   String baseclass="shape";
    
     public void Draw();    
    
}
class circle implements shape
{
    public void Draw() {
        System.out.println("Drawing Circle here");
    }
         
}