java之接口interface

public interface Runner{
    public static final int id = 1;
    public void strrt();
    public void run();
    public void stop();
}

public class TestInterface{
    public static void main(String args[]){
        Singer student = new Student("studentName");
        student.sing();
        student.sleep();
        
        Teacher teacher = new Teacher("TeacherName");
        teacher.painter();
        teacher.eat();
        
        Painter painter = (Painter)teacher;
        painter.painter();
        painter.eat();
        //下面是实现多态的部分
        TestInterface t1 = new TestInterface();
        t1.f(student);
        t1.f(teacher);
    }
    public void f(Singer s){
        s.sing();
    }
}
interface Singer{
    public void sing();
    public void sleep();
}
interface Painter{
    public void painter();
    public void eat();
}
class Student implements Singer{
    private String name;
    public Student(String name){
        this.name = name;
    }
    public String getName(){
        return name;
    }
    public void Study(){
        System.out.println("studying...");
    }
    public void sing(){
        System.out.println("study is singing");
    }
    public void sleep(){
        System.out.println("study is sleeping");
    }
}
class Teacher implements Singer,Painter{
    private String name;
    public Teacher(String name){
        this.name = name;
    }
    public String getName(){
        return name;
    }
    public void sing(){
        System.out.println("teacher is singing");
    }
    public void sleep(){
        System.out.println("teacher is sleeping");
    }
    public void painter(){
        System.out.println("teacher is paintering");
    }
    public void eat(){
        System.out.println("teacher is eating");
    }
}