Wolatile变量与原子变量之间的区别是什么？

Are they the same if we just considered the get/set methods? Or to say, are the following two pieces of code equivalent?

如果我们只考虑get / set方法，它们是否相同？或者说，以下两段代码是等价的吗？

private volatile boolean a;
public boolean isA(){
    return a;
}
public void setA(boolean a){
    this.a = a;
}


private AtomicBoolean a;
public boolean isA(){
    return a.get();
}
public void setA(boolean a){
    this.a.set(a);
}

1 个解决方案

#1

The advantage of the Atomic* classes are their atomic methods like 'getAndSet()' or 'compareAndSet()' which would otherwise require locking.

Atomic *类的优点是它们的原子方法，如'getAndSet（）'或'compareAndSet（）'，否则需要锁定。

If you don't have any compound actions, e.g. just want to ensure that all threads see the latest value of 'a', then volatile is sufficient.

如果您没有任何复合动作，例如只是想确保所有线程都看到'a'的最新值，那么volatile就足够了。

#1