java接口多实现和多继承

package test;
interface mouth {
    public abstract void speak();
}
interface  nose{
    public abstract void smell();
}
interface  eye{
    public abstract void look();
}
interface  ear{
    public abstract void listen();
}
interface  brain{
    public abstract void think();
}
interface head extends mouth,nose,eye,ear,brain {

}
class myHead implements head {
    public void speak() {
        System.out.println("I can speak");
    }
    public void smell() {
        System.out.println("I can smell");
    }
    public void look() {
        System.out.println("I can see");
    }
    public void listen() {
        System.out.println("I can listen");
    }
    public void think() {
        System.out.println("I can think");
    }
}
class yourHead implements  mouth,nose,eye,ear,brain {
    public void speak() {
        System.out.println("you can speak");
    }
    public void smell() {
        System.out.println("you can smell");
    }
    public void look() {
        System.out.println("you can see");
    }
    public void listen() {
        System.out.println("you can listen");
    }
    public void think() {
        System.out.println("you can think");
    }
}
public class InterfaceTest {

    public static void main(String[] args) {
        myHead myHead = new myHead();
        myHead.speak();
        myHead.smell();
        myHead.listen();
        myHead.look();
        myHead.think();
        yourHead yourHead = new yourHead();
        yourHead.speak();
        yourHead.smell();
        yourHead.listen();
        yourHead.look();
        yourHead.think();
    }

}

I can speak
I can smell
I can listen
I can see
I can think
you can speak
you can smell
you can listen
you can see
you can think