exercise6_11.java

Introduction to java programming 一书中所有编程练习部分的源码

public class Exercise6_11 {
    public static void main(String[] args) {
        MyPoint p1 = new MyPoint(1, 2);
        MyPoint p2 = new MyPoint(4, 2.5);
        System.out.println(p1.distance(p2));
        System.out.println(MyPoint.distance(p1, p2));
    }
}

class MyPoint {
    private double x;
    private double y;
    
    public MyPoint() {
        
    }
    
    public MyPoint(double x, double y) {
        this.x = x;
        this.y = y;
    }
    
    public double distance(MyPoint secondPoint) {
        return distance(this, secondPoint);
    }
    
    public static double distance(MyPoint p1, MyPoint p2) {
        return Math.sqrt((p1.x - p2.x) * (p1.x - p2.x) +
            (p1.y - p2.y) * (p1.y - p2.y));
    }
}