如何在设置AtomicBoolean之前检查另一个条件？(How to check another condition before set AtomicBoolean?)

 我有一个AtomicBoolean并想要设置它，如果另一个条件也是如此： 
 
 例如，我们有一个带有Active和Saldo字段的bankaccount。 在setInctive方法中，我必须检查Saldo字段是否正好为零，然后将Active字段设置为false。 
 
 这是我的解决方案，但我不确定这是否真的有效！ 
 
private final AtomicBoolean active = new AtomicBoolean(true);
private final AtomicReference<Double> saldo = new AtomicReference<>(0.0);

@Override
public boolean setInctive() {
    //First: check if saldo is 0.0
    //Second: set active to false

    saldo.getAndUpdate(aDouble ->  {
        if(aDouble == 0)
            active.set(false);

        return aDouble;
    });

    //return negated value of the active field
    return !active.get();
}
 
 什么是原子的正确解决方案，这甚至可以不使用锁？ 

I have an AtomicBoolean and want to set it, if another condition is also true:
 
For example we have a bankaccount with an Active and Saldo field. In the method setInctive, I have to check if the Saldo field is exactly zero and then set the Active field to false.
 
This is my solution, but I'm not sure if this really works!
 
private final AtomicBoolean active = new AtomicBoolean(true);
private final AtomicReference<Double> saldo = new AtomicReference<>(0.0);

@Override
public boolean setInctive() {
    //First: check if saldo is 0.0
    //Second: set active to false

    saldo.getAndUpdate(aDouble ->  {
        if(aDouble == 0)
            active.set(false);

        return aDouble;
    });

    //return negated value of the active field
    return !active.get();
}
 
What would be a correct solution with atomics and is this even possible without using locks?

原文：https://stackoverflow.com/questions/29803510