package QQQ;public class Computer {/*** 该类实现对主方法中传入的参数求阶乘的操作，并将结果返回主方法*/public int getQQQ(int n) {// TODO Auto-generated method stubint x=1;//累乘使用的变量，赋初值为1for(int i=1;i<=n;i++){x*=i;}return x;}}

package ZZZ;
import QQQ.Computer;
import java.util.*;
public class App {/*** 该类为主类，里面包含主方法，输入一个数n，通过调用Computer类，* 实现求n阶乘的操作*/public static void main(String[] args) {// TODO Auto-generated method stubComputer c=new Computer();//实例化一个Computer类的对象Scanner r=new Scanner(System.in);System.out.println("请输入一个数：");int n=r.nextInt();c.getQQQ(n);//调用Computer类中的getQQQ方法System.out.println(n+"的阶乘是："+c.getQQQ(n));}}

package cn.edu.ccut.point;public class MyPoint {/*** 该类实现求两点距离的功能*/double x;double 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;}MyPoint(){//构造方法，使x，y的初值为0x=0;y=0;}public MyPoint(double x,double y){//带参数的构造方法，可以通过参数传递，实现赋值this.x=x;this.y=y;}public static double distance(MyPoint p1,MyPoint p2){//求距离的方法double x1=p1.getX();//通过getX（）和getY（），获取两点的横纵坐标double x2=p2.getX();double y1=p1.getY();double y2=p2.getY();return Math.sqrt(Math.pow((x1-x2),2)+Math.pow((y1-y2), 2));}
}

import cn.edu.ccut.point.*;
import java.util.*;
public class Test {/*** 该类为主类，在该类中调用MyPoint类，实现求两点距离的功能*/public static void main(String[] args) {// TODO Auto-generated method stubScanner r=new Scanner(System.in);System.out.println("请输入点1的X值");double Ax=r.nextDouble();System.out.println("请输入点1的Y值");double Ay=r.nextDouble();System.out.println("请输入点2的X值");double Bx=r.nextDouble();System.out.println("请输入点2的Y值");       double By=r.nextDouble();MyPoint p1=new MyPoint(Ax,Ay);//实例化MyPoint类的对象，并为点传递横纵坐标值MyPoint p2=new MyPoint(Bx,By);System.out.print("两点间距离为："+MyPoint.distance(p1,p2));}}