Java实现猜拳游戏的核心在于电脑随机数的生成，Java中的随机数生成方法是：
首先引入包 import java.util.*; 然后 int r=new Random().nextInt(3); （nextInt中的数字三代表随机数生成的个数，从零开始）
所以在猜拳的输入中需要有0、1、2三个数字代替，如果要输入汉字，则用if进行相应判断即可。
在实现的游戏中实现①猜拳；②记录胜负；③玩家决定游戏局数；④输出获胜、失败及平局；⑤统计总共的胜负结果（根据获胜次数判断）
①猜拳基础功能：该部分代码可以放到一个方法中，减少主函数代码量。
电脑出拳即 int r=new Random().nextInt(3); 注意：该部分一定要写在for循环内部，否则无法实现每次不同的随机数。
通过if判断双方出拳是否相等 if(a==0&&r==0) else if(a==0&&r==1) else if(a==0&&r==2) 即可实现猜拳，if内直接输出相关语句即可
②记录胜负： 定义猜拳方法为int ，通过返回值记录相关比赛的胜负情况 ,可以用0--失败；1--获胜；2--平局 进行记录，在主函数中对相应抛出的数字记录即可
if(a==0&&r==0){
System.out.println("The computer comes out with cloth,it was a draw. ");
return 2;
}
h=comp.compare(a,r); if (h==1) j++;
③玩家决定局数： 定义一个数，在循环中不大于该数即可
④输出获胜、失败及平局： j、k即胜利和失败，平局数即n-j-k。
⑤统计结果，直接用if比较i、j的数字结果即可。
一下为代码
主函数部分：
1 import java.util.*;
2
3 public class Main {
4 public static void main(String args[]){
5 Scanner scanner=new Scanner(System.in);
6 Compare comp=new Compare();
7 int h=0,j=0,k=0;
8 System.out.println("rules:0--cloth;1--stone;2--scissors.\nU can choose how many times you want to play:");
9 int n=scanner.nextInt();
10 for(int i=1;i<=n;i++){
11 System.out.print("It's the "+i+" round,your turn:");
12 int a=scanner.nextInt();
13 int r=new Random().nextInt(3);
14 switch (a){
15 case 0:
16 h=comp.compare(a,r);
17 break;
18 case 1:
19 h=comp.compare(a,r);
20 break;
21 case 2:
22 h=comp.compare(a,r);
23 break;
24 default:
25 System.out.println("Wrong number!");
26 break;
27 }
28 if (h==1)
29 j++;
30 else if(h==0)
31 k++;
32
33 }
34 System.out.println("The total times you won are "+j+",The draw times are "+(n-j-k)+".");
35 if(j>k)
36 System.out.println("You are the final winner");
37 else if(k>j)
38 System.out.println("The computer is the winner.");
39 if(j==k)
40 System.out.println("The final result is draw");
41 }
42 }
compare 方法部分：
1 package SS2_5;
2
3 public class Compare {
4 public int compare(int a,int r){
5 int counter=0;
6 if(a==0&&r==0){
7 System.out.println("The computer comes out with cloth,it was a draw. ");
8 return 2;
9 }
10 else if(a==0&&r==1){
11 System.out.println("The computer comes out with stone, you won. ");
12 return 1;
13 }
14 else if(a==0&&r==2){
15 System.out.println("The computer comes out with scissor,you lost. ");
16 return 0;
17 }
18 else if(a==1&&r==0){
19 System.out.println("The computer comes out with cloth,you lost. ");
20 return 0;
21 }
22 else if(a==1&&r==1){
23 System.out.println("The computer comes out with stone,it was a draw. ");
24 return 2;
25 }
26 else if(a==1&&r==2){
27 System.out.println("The computer comes out with scissors,you won. ");
28 return 1;
29 }
30 else if(a==2&&r==0){
31 System.out.println("The computer comes out with cloth,you won. ");
32 return 1;
33 }
34 else if(a==2&&r==1){
35 System.out.println("The computer comes out with stone,you lost. ");
36 return 0;
37 }
38 else if(a==2&&r==2){
39 System.out.println("The computer comes out with scissors,it was a draw. ");
40 return 2;
41 }
42 else
43 return 0;
44 }
45 }
结果示例：
1 rules:0--cloth;1--stone;2--scissors. 2 U can choose how many times you want to play: 3 4 4 It's the 1 round,your turn:1 5 The computer comes out with stone,it was a draw. 6 It's the 2 round,your turn:0 7 The computer comes out with stone, you won. 8 It's the 3 round,your turn:2 9 The computer comes out with scissors,it was a draw. 10 It's the 4 round,your turn:0 11 The computer comes out with stone, you won. 12 The total times you won are 2,The draw times are 2. 13 You are the final winner
标签：Java,猜拳,System,小游戏,&&,println,computer,comes,out From： https://www.cnblogs.com/bailichangchuan/p/16708759.html