Java:在x%的情况下做一些事情 [英] Java: do something x percent of the time

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问题描述

我需要几行Java代码,这些代码在x%的时间内随机运行命令。

I need a few lines of Java code that run a command x percent of the time at random.

psuedocode:

psuedocode:

boolean x = true 10% of cases.

if(x){
  System.out.println("you got lucky");
}


推荐答案

如果是时间你的意思是代码正在被执行的时间,所以你想要在代码块内部执行10%的时间执行整个块的事情你可以做一些事情喜欢:

If by time you mean times that the code is being executed, so that you want something, inside a code block, that is executed 10% of the times the whole block is executed you can just do something like:

Random r = new Random();

...
void yourFunction()
{
  float chance = r.nextFloat();

  if (chance <= 0.10f)
    doSomethingLucky();
}

当然 0.10f 代表10%,但你可以调整它。像每个PRNG算法一样,这通过平均使用来工作。除非 yourFunction()被称为合理的次数,否则你不会接近10%。

Of course 0.10f stands for 10% but you can adjust it. Like every PRNG algorithm this works by average usage. You won't get near to 10% unless yourFunction() is called a reasonable amount of times.

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