Java程序生成无重复的随机数
对于Java中的随机数，请创建一个Random类对象-
Random randNum = new Random();
现在，创建一个HashSet以仅获取唯一元素，即不重复-
Set<Integer>set = new LinkedHashSet<Integer>();
使用随机类nextInt生成随机数-
while (set.size() < 5) {
set.add(randNum.nextInt(5)+1);
}示例
import java.util.LinkedHashSet;
import java.util.Random;
import java.util.Set;
public class Demo {
public static void main(final String[] args) throws Exception {
Random randNum = new Random();
Set<Integer>set = new LinkedHashSet<Integer>();
while (set.size() < 5) {
set.add(randNum.nextInt(5)+1);
}
System.out.println("Random numbers with no duplicates = "+set);
}
}输出结果
Random numbers with no duplicates = [2, 4, 1, 3, 5]