每日一题（16）

public class Question15 {
    public static void main(String[] args){
        System.out.println("hello");
        http://hello.com;
        System.out.println(" world");
    }
}

public class Question15 {
    public static void main(String[] args){
        System.out.println("hello");
        http: //hello.com;这里的//其实是注解的作用
        System.out.println(" world");
    }
}

public class Point {
    protected  int x,y;
    private  String name;

    Point(int x,int y){
        this.x = x;
        this.y = y;
        this.name = makeName();
    }

    protected  String makeName(){
        return "["+ x + "," + y +"]";
    }

    @Override
    public String toString(){
        return name;
    }

}

class ColorPoint extends Point{
     private String color;

     ColorPoint(int x, int y, String color){
         super(x,y);
         this.color = color;
     }

     @Override
     protected String makeName(){
         return super.makeName() + ":" + color;
     }

     public static void main(String[] args){
         System.out.println(new ColorPoint(4, 2, "blue"));
     }
}