Question in thread

[Sagar Shroff]

public class Cert extends Thread
{
static int x=10;
public static void main( String args[] ) throws Exception
{
Cert Cert = new Cert();
Thread t1 = new Thread(Cert);
Thread t2 = new Thread(Cert);
t1.start();
t2.start();
}

public synchronized void run()
{
System.out.print(++x + " ");;
}
}


In the above program can the Output be guaranteed ???.........I think the output can be guaranteed as Both the Thread are running on different Objects......Am i Right ??

[Sagar Shroff]

sagar shroff wrote:public class Cert extends Thread
{
static int x=10;
public static void main( String args[] ) throws Exception
{
Cert Cert = new Cert();
Thread t1 = new Thread(Cert);
Thread t2 = new Thread(Cert);
t1.start();
t2.start();
}

public synchronized void run()
{
System.out.print(++x + " ");;
}
}


In the above program can the Output be guaranteed ???.........I think the output can be guaranteed as Both the Thread are running on different Objects......Am i Right ??

Or Do the two Threads run on the same Object ...Please Help ??....

[Rahul Sudip Bose]

sagar shroff wrote:

Thread t1 = new Thread(Cert);
Thread t2 = new Thread(Cert);
    
public synchronized void run()

Well, you passed the same runnable Cert to both the threads and the run() method is synchronized.

See if this code helps :

public class Cert extends Thread
{
static int x = 10;
	public static void main( String args[] ) throws Exception
	{
	Cert Cert = new Cert();
	Thread t1 = new Thread(Cert);
	Thread t2 = new Thread(Cert);
	t1.start();
	t2.start();
	}

	public synchronized void run()
	{	
		for(int i = 0; i<5 ; i++)
		{
			System.out.println(++x + " " + Thread.currentThread());
		}
	
		System.out.println("End\n");
	}
} 

OUTPUT :

C:\rb>java Cert
11 Thread[Thread-1,5,main]
12 Thread[Thread-1,5,main]
13 Thread[Thread-1,5,main]
14 Thread[Thread-1,5,main]
15 Thread[Thread-1,5,main]
End

16 Thread[Thread-2,5,main]
17 Thread[Thread-2,5,main]
18 Thread[Thread-2,5,main]
19 Thread[Thread-2,5,main]
20 Thread[Thread-2,5,main]
End

[Ikpefua Jacob-Obinyan]

@Sagar...Please always use code tags when writing programs...it makes it easier to analyse, you will find it at the top of the editor when creating your posts...
If you extend a Thread, override the run() method, pass 'a-Thread' or 'a-Runnable' to the threads constructor and invoke the start() method on the Thread Object, the 'new-thread-of-execution' is guaranteed to start and run to completion, provided there is NO other circumstance that alter the normal flow of the program.

Regards

Ikpefua

[Sagar Shroff]

Thanks a lot Rahul......and Jacob yeah I will take care next time...nd thnks.