Question

利用java从1——22中随机产生5个随机数且不重复

Answer 1

Set<Integer> set = new HashSet<Integer>();
while(set.size()<5){
set.add(new Random().nextInt(22)+1);
}
System.out.println(set);
//我们都知道Set是无序、且不重复，控制条件是while

Answer 2

package edu.sjtu.erplab.io;

import java.util.Random;

public class RandomTest {
public static void main(String[] args) {
int max=22;
int min=1;

int [] num = new int[5];

List<Integer> list = Arrays.asList(num);

Random random = new Random();
while(list.size()<=5){
int s = random.nextInt(max)%(max-min+1) + min;
if(!list .contains(s)){
list.add(s);
System.out.println(s);
}
}
}
}