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import java.*;
 
 
public class Main
{
 
	static Object A = new Object(); 
	static Object B = new Object();
 
	static class AB implements Runnable { 
	  public void run() { 
        	 synchronized (A) {
			Thread.sleep(100);
	            synchronized (B) { 
				Thread.sleep(100);
	                   doWork("first"); 
	             }}}} 
 
	static class BA implements Runnable { 
	        public void run() { 
	             synchronized (B) {
			Thread.sleep(100);
	                  synchronized (A) { 
				Thread.sleep(100);
	                         doWork("second"); 
	              }}}}
 
 
	public static void doWork(String in)
	{
		System.out.println( "I'm doing work!" + in);
	}
 
	public static void main(String[] args) 
	{
 
		AB a = new AB();
		BA b = new BA();
 
		Thread t1 = new Thread(a);
		t1.start();
	        Thread t2 = new Thread(b);
		t2.start();
 
	}
 
}

Main.java:13: unreported exception java.lang.InterruptedException; must be caught or declared to be thrown
			Thread.sleep(100);
			            ^
Main.java:15: unreported exception java.lang.InterruptedException; must be caught or declared to be thrown
				Thread.sleep(100);
				            ^
Main.java:22: unreported exception java.lang.InterruptedException; must be caught or declared to be thrown
			Thread.sleep(100);
			            ^
Main.java:24: unreported exception java.lang.InterruptedException; must be caught or declared to be thrown
				Thread.sleep(100);
				            ^
4 errors

Standard output is empty