/*回顾一下数学公式：

两点的坐标是(x1, y1)和(x2, y2) 则两点之间的距离公式为 d=√[(x1-x2)²+(y1-y2)²]

注意特例： 当x1=x2时 两点间距离为|y1-y2| 当y1=y2时 两点间距离为|x1-x2|

中点坐标：midpoint(X,Y)

X=(X1+X2)/2

Y=(Y1+Y2)/2

*/

//自定义坐标类

public class Pointer { private double x; private double y; public Pointer(double x,double y){//构造方法初始化 this.setX(x); this.setY(y); } public double getX() { return x; } public void setX(double x) { this.x = x; } public double getY() { return y; } public void setY(double y) { this.y = y; } //两点之间的距离 public static double distance(Pointer a,Pointer b){//静态方法，通过类名.方法名调用 double result= (Math.pow(a.getX()-b.getX(),2)+Math.pow(a.getY()-b.getY(),2)); return Math.sqrt(result);

} public void display(){ System.out.println("("+this.getX()+","+this.getY()+")"); } public String toString(){ return "("+x+","+y+")";

} public boolean equals(Pointer obj){ if(this.getX()==obj.getX()&&this.getY()==obj.getY()){ return true; } return false; } //两点坐标的中点 public static String minpoint(Pointer a,Pointer b){ double x=(a.getX()+b.getX())/2; double y=(a.getY()+b.getY())/2; return "("+x+","+y+")";

}

}

//测试类

public class Demotest {

public static void main(String[] args) {

Pointer [] test=new Pointer [2];//对象数组 test[0]=new Pointer(2, 2); test[1]=new Pointer(3,3); test[0].display(); test[1].display(); System.out.println("**********************开始**********************"); System.out.println(test[0].toString()+test[1].toString()+"两点之间的距离："+Pointer.distance(test[0], test[1])); System.out.println(test[0].toString()+test[1].toString()+"两点的中点坐标是："+Pointer.minpoint(test[0], test[1])); System.out.println(test[0].equals(test[1])); }

}

/*******************当然也可选择JDK里面的Pointer类****************/

import java.awt.Point;import java.util.Scanner;

public class Test { public static void main(String[] args){ System.out.println("请输入有几组："); Scanner scanner = new Scanner(System.in); int groupCount = scanner.nextInt();

double results[] = new double[groupCount]; for (int i=0;i