Java for 循环中的两个分号是什么意思？
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What do two semicolons mean in Java for loop?
提问by Shawn
I was looking inside the AtomicIntegerClass and I came across the following method:
我正在查看AtomicIntegerClass内部，发现了以下方法：
/**
* 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?
有人能解释一下是什么for(;;)意思吗？
回答by Bozho
It is equivalent to while(true).
它相当于while(true)。
A for-loop has three elements:
for 循环包含三个元素：
- initializer
- condition (or termination expression)
- increment expression
- 初始化程序
- 条件（或终止表达式）
- 增量表达式
for(;;)is not setting any of them, making it an endless loop.
for(;;)没有设置它们中的任何一个，使其成为无限循环。
Reference: The for statement
参考：for 语句
回答by Alberto Zaccagni
It's the same thing as
这与
while(true) {
//do something
}
...just a little bit less clear.
Notice that the loop will exit if compareAndSet(current, next)will evaluate as true.
……只是有点不太清楚。
请注意，如果compareAndSet(current, next)将评估为，则循环将退出true。
回答by Esko
It's just another variation of an infinite loop, just as while(true){}is.
它只是无限循环的另一种变体，就像现在一样while(true){}。
回答by John Kane
That is a for ever loop. it is just a loop with no defined conditions to break out.
这是一个永远循环。它只是一个没有定义条件的循环。
回答by Isaac Truett
It's an infinite loop, like while(true).
这是一个无限循环，就像while(true).
