/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	static int x = 0;
 
	public static void main (String[] args) throws java.lang.Exception
	{
		new Thread(() -> {
			try {
				Thread.sleep(1000);
			} catch (InterruptedException ex) { }
			x = 1;
		}).start();
 
		while (foo());
		System.out.println("Done");
	}
 
	static boolean foo() {
		return x == 0;
	}
}

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