为什么java.util.concurrent.atomic.AtomicBoolean在内部用int实现? [英] Why java.util.concurrent.atomic.AtomicBoolean is internally implemented with int?

问题描述

AtomicBoolean将其值存储在:

AtomicBoolean stores its value in:

private volatile int value;

然后，例如，提取其值是这样的:

Then, for example, extracting its value is done like this:

    public final boolean get() {
    return value != 0;
}

其背后的原因是什么?为什么不使用boolean?

What is the reason behind it? Why boolean was not used?

推荐答案

AFAIK，int是可在不同机器类型上实现的最小CAS操作类型.

AFAIK, int is the smallest type CAS operations can be implemented across different machine types.

注意:由于对象分配是8字节对齐的，因此使用较小的类型将不会节省任何内存.

Note: as object allocations are 8 byte aligned, using a smaller type wouldn't save any memory.

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