What do two semicolons mean in Java for loop? [duplicate]

This question already has answers here: How does a for loop work, specifically for(;;)? (6 answers) Closed 1 year ago.

I was looking inside the AtomicInteger Class开发者_运维技巧 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?

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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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It's the same thing as

while(true) {
    //do something
}

...just a little bit less clear.
Notice that the loop will exit if compareAndSet(current, next) will evaluate as true.

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It's just another variation of an infinite loop, just as while(true){} is.

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That is a for ever loop. it is just a loop with no defined conditions to break out.

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It's an infinite loop, like while(true).