/*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

System.out.println("请输入第"+(i+1) + "组2点的坐标(以,分隔)：");

String line = scanner.next();

String[] values = line.split(",");

if (values.length != 4) {

System.out.println("输入的数据格式不对！");

i = i--;

}

else {

double p1 = Double.valueOf(values[0]);//返回保持用参数字符串 s 表示的 double 值的 Double 对象

double p2 = Double.valueOf(values[1]);

double p3 = Double.valueOf(values[2]);

double p4 = Double.valueOf(values[3]);

results[i] = getDistance(p1, p2, p3, p4);

}

}

for (int i=0;i

System.out.println(results[i]);

}

public static double getDistance(double p1,double p2,double p3,double p4) {

double d = 0.0;

d = Point.distance(p1, p2, p3, p4);

return d;

}

}