[英]How can I generate two random numbers(not repeated)?
I want to generate two numbers in range 0..99 in java and it has to be not repeated. 我想在Java中生成0..99范围内的两个数字,并且不必重复。 I tried code below but it is not working for me.
我在下面尝试了代码,但对我不起作用。
int number1 = randomGenerator.nextInt(100);
int number2 = randomGenerator.nextInt(100);
if(number1 == number2){
while (number1 != number2){
number2 = randomGenerator.nextInt(100);
}
}
If number1
and number2
are equal, they will not be not equal. 如果
number1
和number2
相等,则它们将不相等。 Just change your while
loop: 只需更改您的
while
循环:
int number1 = randomGenerator.nextInt(100);
int number2 = randomGenerator.nextInt(100);
while(number1 == number2){
number2 = randomGenerator.nextInt(100);
}
It's not working because you never enter your loop, because the condition is wrong. 这是行不通的,因为您永远不会进入循环,因为条件是错误的。 In the loop, you want
==
, not !=
. 在循环中,您需要
==
,而不是!=
。 You can also remove the if
: 您也可以删除
if
:
int number1 = randomGenerator.nextInt(100);
int number2 = randomGenerator.nextInt(100);
while (number1 == number2){
number2 = randomGenerator.nextInt(100);
}
int number1 = randomGenerator.nextInt(100);
int number2 = randomGenerator.nextInt(99);
if(number2 >= number1) {
++number2;
}
Also check discussion about it at Generate random index different then any one given in a set 还可以在生成随机索引而不是集合中给定的任何索引时检查有关它的讨论
If they all have to be unique, you should add the results to a list. 如果它们都必须唯一,则应将结果添加到列表中。 Then, you can compare the current random number to each of the past results.
然后,您可以将当前随机数与过去的每个结果进行比较。
Random random = new Random();
int number1 = random.nextInt(100);
int number2 = random.nextInt(100);
List<Integer> randomsList = new ArrayList<Integer>();
while (randomsList.contains(number1)){
number1 = random.nextInt(100);
}
randomsList.add(number1);
while (randomsList.contains(number2)){
number2 = random.nextInt(100);
}
randomsList.add(number2);
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