Java中哪些情况需要同步方法访问?
在什么情况下需要同步对实例成员的访问?我知道对类的静态成员的访问总是需要同步 - 因为它们在类的所有对象实例之间共享.
In what cases is it necessary to synchronize access to instance members? I understand that access to static members of a class always needs to be synchronized- because they are shared across all object instances of the class.
我的问题是，如果我不同步实例成员，我什么时候会出错?
My question is when would I be incorrect if I do not synchronize instance members?
例如，如果我的班级是
public class MyClass {
private int instanceVar = 0;
public setInstanceVar()
{
instanceVar++;
}
public getInstanceVar()
{
return instanceVar;
}
}
在什么情况下(使用类MyClass)我需要有方法:public synchronized setInstanceVar() 和公共同步 getInstanceVar() ?
in what cases (of usage of the class MyClass) would I need to have methods:
public synchronized setInstanceVar() and
public synchronized getInstanceVar() ?
提前感谢您的回答.
推荐答案
这取决于你是否希望你的类是线程安全的.大多数类不应该是线程安全的(为简单起见)，在这种情况下您不需要同步.如果您需要它是线程安全的，您应该同步访问或使变量可变.(它避免了其他线程获取陈旧"数据.)
It depends on whether you want your class to be thread-safe. Most classes shouldn't be thread-safe (for simplicity) in which case you don't need synchronization. If you need it to be thread-safe, you should synchronize access or make the variable volatile. (It avoids other threads getting "stale" data.)
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