0921-----In class to practive-----enlish starts

 

//client class
public class Text1{
    //main function
    public static void main(String args[]){
        Robot r1=new Robot(){
            public void run(){
                System.out.println("I can running too.");
            }
            public void jump(){
                System.out.println("I can jumpping too.");
            }
        };
        r1.run();
        r1.jump();
        Robot r2=new T200();
        r2.jump();
        r2.run();
        r2.listen();
        
        //comments implements
        // Runnable implements one
        Runnable r11=new Runnable(){
            public void run(){
                System.out.println("I am java 7!");
            }
        };
        r11.run();

        //java 8 implements
        // Runnable implements two
        Runnable r22=()->System.out.println("I am java 8!");
        r22.run();

        //java 8 implements
        ICpu cpu=(String str)->System.out.println(str);
        cpu.start("Cpu is starting working!");
    }
}
//Robot class
//if the class has an abstract function , then the class must be an abstract class
//the abstract class must not be hasing an abstract function
abstract class Robot{
    //listenning
    public void listen(){
        System.out.println("I can listenning.");
    }
    //speaking
    public void speak(){
        System.out.println("I can speaking.");
    }
    //running
    //abstract function
    public abstract void run();
    //jumpping
    //abstract function
    public abstract void jump();
}
//T100 extends Robot
abstract class T100 extends Robot{
    public void run(){
        System.out.println("I can running.");
    }
    public abstract void jump();
}
//T200 extends Robot
class T200 extends T100{
    public void jump(){
        System.out.println("I can jumpping.");
    }
}
//interface example
interface ICpu{
    //const only
    //abstract function only
    //the default modifier is public and abstract
    double PI=3.1415927;
    void start(String str);
}