java 生成五位随机数

生成五位不重复的随机数的方法有多种，下面是两个示例代码：

示例1：

import java.util.HashSet;
import java.util.Random;
import java.util.Set;

public class RandomNumber {
    public static void main(String[] args) {
        Set<Integer> set = new HashSet<>();
        Random random = new Random();
        
        while (set.size() < 5) {
            int number = random.nextInt(100);
            set.add(number);
        }
        
        for (int num : set) {
            System.out.println(num);
        }
    }
}

示例2：

import java.util.Arrays;
import java.util.Random;

public class RandomNumber {
    public static void main(String[] args) {
        int[] numbers = new int[5];
        Random random = new Random();
        
        for (int i = 0; i < numbers.length; i++) {
            int number = random.nextInt(100);
            
            for (int j = 0; j < i; j++) {
                if (number == numbers[j]) {
                    number = random.nextInt(100);
                    j = -1;
                }
            }
            
            numbers[i] = number;
        }
        
        Arrays.stream(numbers).forEach(System.out::println);
    }
}