Question

用JAVA编写一个程序,要求生成5个随机数,随机数的取值范围是20到60

Answer 1

import java.util.List;
import java.util.Random;

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

/**
*
* @author david
*/
public class TestRandom {
public static void main(String[] args){
List list=new ArrayList();
Random r=new Random();
int ikey=0;
while(true){
ikey=r.nextInt(60);//随机生成小于60的整数
if(ikey<20) //如果生成的整数小于20,则重新生成
continue;
if(!list.contains(ikey)){ //判断这个随机数是否已经生成过，避免重复
list.add(ikey);
if(list.size()==5)
break;
}
}
//打印
for(int i=0;i<list.size();i++)
System.out.println(list.get(i));
}
}

Answer 2

public class RandomTest {

public static void main(String[] args) {

int a;

java.util.Random r = new java.util.Random();

for (int i = 0; i < 5; i++) {

System.out.println(r.nextInt(a>=50 && a<= 60));

}

}
}
不知道对不对 好久没玩java了