java Java中如何生成正数和负数
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how to generate positive and negative numbers in Java
提问by Reshad
Possible Duplicate:
How to generate random positive and negative numbers in java
可能的重复：
如何在java中生成随机正负数
Hello I am trying to create a method in Java to create negative and positive values in Java.
您好，我正在尝试在 Java 中创建一种方法来在 Java 中创建负值和正值。
the problem is that I don't know how to get this programmed but I do know the logic.. here is what I tought it should be
问题是我不知道如何编程，但我知道逻辑..这就是我认为应该是的
Random generator = new Random();
for (int i = 0; i < 21; i++)
{
System.out.print(generator.nextInt(100) + 1);
System.out.println();
}
but with the code above I get only positive values and I need values between -100 and 100 but how can I accomplish something like that?
但是使用上面的代码，我只得到正值，我需要 -100 到 100 之间的值，但是我怎样才能完成这样的事情？
回答by Pablo Santa Cruz
You can use:
您可以使用：
Random generator = new Random();
int val = 100 - generator.nextInt(201);
Or, as JoachimSauer suggested in the comments:
或者，正如 JoachimSauer 在评论中所建议的那样：
int val = generator.nextInt(201) - 100;
回答by Peter Lawrey
The general formula is
一般公式是
int val = rand.nextInt(max - min + 1) + min;
Note that minand maxcan be negative. (max > min)
请注意，minandmax可以是负数。（最大值 > 最小值）
