Random——生成不重复的随机数

import java.util.Random;

public class Demo {
public static void main(String args[]) {
Random rnd = new Random();
int[] nums = new int[25];
for (int i = 1; i < 26; i++) {
int p = rnd.nextInt(25);
if (nums[p] != 0) {
i--;
} else {
nums[p] = i;
}
}
for (int i = 0; i < 25; i++) {
System.out.print(nums[i] + "  ");
if (i % 5 == 4)
System.out.println();
}
}
}

int x = new Random().nextInt(30);