Java, executing a method when object's scope ends

Question

I've an object with a certain state. The object is passed around and it's state is temporarly altered. Something like:

public void doSomething(MyObject obj) {
    obj.saveState();
    obj.changeState(...);
    obj.use();
    obj.loadState();
}

In C++ it's possible to use the scope of an object to run some code when constructing and distructing, like

NeatManager(MyObject obj) { obj.saveState(); }
~NeatManager() { obj.loadState(); }

and call it like

void doSomething(MyObject obj) {
    NeatManager mng(obj);
    obj.changeState();
    obj.use();
}

This simplifies the work, because the save/load is binded with the scope of NeatManager object. Is it possible to do something like this in Java? Is there a way to call a method when the object goes out of the scope it's been declared in? I'm not talking about finalize() nor "destruction" (garbage collection), I'm interested on the scope.

Thanks

Answer 1

Nope, there's no such thing. The closest is probably a try/finally block:

try
{
    obj.changeState(...);
    obj.use();
}
finally
{
    obj.loadState();
}

This ensures that loadState() gets called even when an Exception is thrown or there's an early return.

Answer 2

No, there's nothing like that. The closest you've got is try/finally.

In C# there's the using statement, which executes a Dispose method at the end:

using (Stream x = ...)
{
} // x.Dispose() is called here, in a finally block

There's a possibility that Java 7 will gain something a bit like this, but I don't think anything's been set in stone yet.