在Java中,两个分号意味着什么? [英] What do two semicolons mean in Java for loop?

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问题描述

     code> / ** 
*原子上增加一个当前值。
*
* @返回上一个值
* /
public final int getAndIncrement(){
for(;;){
int current = get ();
int next = current + 1;
if(compareAndSet(current,next))
return current;






$ b

有人可以解释 (;;)是指?

解决方案

当(true)时,它相当于

for循环有三个元素:


  • 初始值设定项

  • 条件(或终止表达式)
  • 增量表达式


code> for(;;)没有设置它们,使得它成为一个无限循环。

参考: for语句


I was looking inside the AtomicInteger Class and I came across the following method:

/**
 * Atomically increments by one the current value.
 *
 * @return the previous value
 */
public final int getAndIncrement() {
    for (;;) {
        int current = get();
        int next = current + 1;
        if (compareAndSet(current, next))
            return current;
    }
}

Can someone explain what for(;;) means?

解决方案

It is equivalent to while(true).

A for-loop has three elements:

  • initializer
  • condition (or termination expression)
  • increment expression

for(;;) is not setting any of them, making it an endless loop.

Reference: The for statement

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