Question

What happens in the following code? Does the synchronization work? This is an interview question.

class T
{
    public static void main(String args[])
    {
        Object myObject = new Object();
        synchronized (myObject)
        {
            myObject = new Object();
        } // end sync
    }
}

Answer 1

Each time you enter the synchronized block, you synchronize on a different object. Most of the time this will not do anything except confuse you, but there is a small chance that two threads will see the same object and wait.

For this reason any code analysers will give you a warning if you are synchronizing on a field which is not final.