package console;

class Useless { 

	public static boolean b = true; 

	public synchronized void u1(){ 
		while(b == true){
			try {
				wait(); 
			}catch(InterruptedException i) {
			
			} 
		}
		
	}

	

	public synchronized void u2() { 
		if (b == true) { 
			b = false; 
		} 
		notify(); 
	} 
} 


public class SleepMessages extends Thread { 
	
	private Useless u; 
	private long time;

	public SleepMessages(Useless u, long time) { 
		this.u=u; 
		this.time=time;
	} 
	public void run() { 
		String importantInfo[] = { 
				"Mares eat oats", 
		"Does eat oats" };
		
		for (int i = 0; i < importantInfo.length; i++) {
			
			u.u1(); 
			
			System.out.println(importantInfo[i] + " - " + 
					getName() + "  " + (System.currentTimeMillis()-time) + "ms"); 
			try { 
				sleep(2000); 
			} catch(InterruptedException e) {} 
		} 
	}        
	public static void main(String args[]) throws
	InterruptedException {
		
		long time = System.currentTimeMillis();
		
		Useless u = new Useless(); 
		Thread t1 = new SleepMessages(u, time); 
		t1.setName("t1"); 
		Thread t2 = new SleepMessages(u, time); 
		t2.setName("t2"); 
		t1.start(); t2.start(); 
		sleep(2000); 
		System.out.println("Here they go!..." + (System.currentTimeMillis() - time) + "ms"); 
		t1.interrupt(); 
		sleep(1000); 
		t2.interrupt(); 
		u.u2(); 
		sleep(1000); 
		u.u2(); 
	}    
}