仅为方法的第一次调用调用方法块 [英] Call a block of a method only for the first call of the method

问题描述

我有一个方法，在这个方法中我有一个块：

I have a method and inside this method I have a block:

public void method()
{
   [block instructions]
}

但是我的方法调用了两次程序。我希望这个块只执行一次，并且只对第一次出现的方法执行。最好和最优雅的方法是什么？

But this method is called twice in my program. I would like this block to be executed only one time and only for the first occurrence of the method. What would be the best and elegant way to do that?

推荐答案

private static final AtomicBoolean hasRunAtom = new AtomicBoolean();

public void method() {
  if (hasRunAtom.getAndSet(true)) return;
  [block instructions]
}

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