创建没有重复的随机数在这种情况下，最大值只有5，所以我可以一个地检查副本，但是我如何以更简单的方式完成这个任务呢？例如，如果最大值的值为20，怎么办？谢谢。int MAX = 5;for (i = 1 , i <= MAX; i++){
drawNum[1] = (int)(Math.random()*MAX)+1;
while (drawNum[2] == drawNum[1])
{
drawNum[2] = (int)(Math.random()*MAX)+1;
}
while ((drawNum[3] == drawNum[1]) || (drawNum[3] == drawNum[2]) )
{
drawNum[3] = (int)(Math.random()*MAX)+1;
}
while ((drawNum[4] == drawNum[1]) || (drawNum[4] == drawNum[2]) || (drawNum[4] == drawNum[3]) )
{
drawNum[4] = (int)(Math.random()*MAX)+1;
}
while ((drawNum[5] == drawNum[1]) ||
(drawNum[5] == drawNum[2]) ||
(drawNum[5] == drawNum[3]) ||
(drawNum[5] == drawNum[4]) )
{
drawNum[5] = (int)(Math.random()*MAX)+1;
}}
3 回答
九州编程
TA贡献1785条经验 获得超4个赞
//random numbers are 0,1,2,3 ArrayList<Integer> numbers = new ArrayList<Integer>();
Random randomGenerator = new Random();while (numbers.size() < 4) {
int random = randomGenerator .nextInt(4);
if (!numbers.contains(random)) {
numbers.add(random);
}}添加回答
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