Java每日一练

设计一个Point类，其x和y坐标可以通过构造器提供。提供一个子类LabeledPoint其构造器接受一个标签值和x,y,坐标，比如；new LabelPoint("Black Thureday"1929，230.07）写出对应的构造器

package com.java.Homework_;

public class Homework09 {
    public static void main(String[] args) {
        new LabeledPoint("fiveday",293.3,40);
    }
}

 

package com.java.Homework_;

public class Point {
    private double x;
    private double y;

    public Point(double x, double y) {
        this.x = x;
        this.y = y;
    }
}

 

package com.java.Homework_;

public class LabeledPoint extends Point{
    private String Label;

    public LabeledPoint(String label,double x, double y) {
        super(x, y);
        Label = label;
    }
}