JavaDemo：双色球，随机位置放加减，使表达式的和为固定值

╰+哭是因爲堅強的太久メ 2024-03-30 14:01 29阅读 0赞

#### 1. 编写双色球 红球一共6组，每组从1-33中抽取一个，6个互相不重复。 蓝球是从1-16中抽取1个数字，这整个组成双色球。 ####

代码如下：

/*
 * Copyright (c) 2020, 2023, 3044483124@qq.com All rights reserved.
 *
 */
 package cn.itcast;
 
 import java.util.*;
 
 /**
 * Project: JavaStudy - ColorBall
 * Powered by jiangbo On 2023-01-03
 * 09:56:23
 * Created by IntelliJ IDEA
 *
 * @author jiangbo [3044483124@qq.com]
 * @version 1.0
 * @since 8/17
 */
 public class ColorBall {
 public static void main(String[] args) {
 Random rand = new Random();
 int i = 0;
 while(i<10) {
 //蓝色球(1-16 选出1个)
 int blue = rand.nextInt(1, 17);
 //红色球(1-33 选出不重复的6个)
 Set<Integer> red = new HashSet<>();
 while (red.size() < 6) {
 red.add(rand.nextInt(1, 34));
 }
 List<Integer> rr = new ArrayList<Integer>(red);
 Collections.sort(rr);
 //System.out.println(rr);
 //System.out.println(blue);
 List ok = new ArrayList();
 ok.add(rr);
 ok.add(blue);
 System.out.println(ok);
 ++i;
 }
 }
 }

结果如下：

#### ![332c449e779040dd9ceef42361681936.png][] ####

#### 2. 编写程序求123456789之间随机位置放加减，使表达式的和为100，求出这样的表达式。（有11个表达式） ####

代码如下：

/*
 * Copyright (c) 2020, 2023, 3044483124@qq.com All rights reserved.
 *
 */
 package cn.itcast;
 
 import java.util.HashSet;
 import java.util.Random;
 import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 /**
 * Project: JavaStudy - Sum10
 * Powered by jiangbo On 2023-01-03
 * 10:02:01
 * Created by IntelliJ IDEA
 *
 * @author jiangbo [3044483124@qq.com]
 * @version 1.0
 * @since 8/17
 */
 public class Sum100 {
 public static void main(String[] args) {
 Set<String> set = new HashSet<String>();
 while (set.size() != 11) {
 String str = getStr();
 if (sum(str) == 100) {
 set.add(str);
 }
 }
 //计算完成之后输出
 for (String s : set) {
 System.out.printf("%s = 100%n", s);
 }
 }
 public static int sum(String str) {
 int sum = 0;
 Pattern pattern = Pattern.compile("-?\\d+");
 Matcher matcher = pattern.matcher(str);
 while (matcher.find()) {
 sum += Integer.parseInt(matcher.group());
 }
 return sum;
 }
 public static String getStr() {
 Random rand = new Random();
 StringBuilder sbu = new StringBuilder();
 String[] ops = {"", "+", "-"};
 for (int i = 1; i < 9; i++) {
 sbu.append(i + ops[rand.nextInt(ops.length)]);
 }
 sbu.append(9);
 return sbu.toString();
 }
 
 }

结果如下：

![47ab486921a346c0a25d8df0ed0c3408.png][]

[332c449e779040dd9ceef42361681936.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/97ee0f109f1740ce960bd6b908b0e356.png
[47ab486921a346c0a25d8df0ed0c3408.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/7a632bbdcfa44c37a743334326ca6fa3.png