Java strange thread behavior

[Bingo90]

I've got a thread with a loop, here's my code:

public class UpdateThread extends Thread
{
	public void run()
	{
 
		while (Game.isActive)
		{
 
		}
		System.out.println("Thread stopped");
	}
}

The Game.isActive is a static boolean that's true while the game is running. It's false when the game stopped.

The code above doesn't work. But why does this code work?

public class UpdateThread extends Thread
{
	public void run()
	{
 
		while (Game.isActive)
		{
                        System.out.println("Thread running");
		}
		System.out.println("Thread stopped");
	}
}

It's very strange. But it would be very inefficient and annoyoing to output something while running the thread, please help!

[GregBrannon]

There's probably a better option than a while( true ) loop to begin with, but the reason the first version isn't doing anything is because of the magic optimizing done by the Java compiler (I think that's where it's done). You can learn more about it by searching 'java empty while loop' or similar search about code that really doesn't do anything.

[Bingo90]

Actually, this isn't my real code it's just an example. My real code has lots of object updating stuff in it but without an output it doesn't seem to stop.

[copeg]

The code above doesn't work. But why does this code work?

Define doesn't work. Does the while loop get executed? Does the while loop continue indefinitely? Is the field Game.isActive declared as volatile? In situations such as this, it helps to provide an SSCCE which can be run and tested by others so that everyone is on the same page.

[Bingo90]

I don't want to show all my code just for this problem. But the while loop continues indefinitely.

--- Update ---

But strangely when in debug mode in eclipse and suspending the program and stepping over or into the code, it will stop.

[copeg]

I don't want to show all my code just for this problem.

I didn't ask for all your code, I asked for an SSCCE

But the while loop continues indefinitely.

I'll ask again, is Game.isActive declared as volatile? If not, please try it

[Bingo90]

Ah thanks, the volatile worked

[copeg]

Glad you got it working