How to detect if a variable has changed?

Question

I have found myself wanting to do certain things in my programs only if a variable has changed. I have so far been doing something like this:

int x = 1;
in         


        

Answer 1

Assuming you have multiple threads you could create an object monitor and wait for the changed object to wake all blocked threads.

Something like this:

private MyObject myObject;

... other thread ...
while(true) {
  myObject.wait()
  logic you want to run when notified.
}
... other thread ...

... later on ...

myObject.change();
myObject.notifyAll();