// thread question

[Meg Adal]

Question from Sun Guoqiao's SCJP2 Mock Exam No. 2 - New Version

  
public class A extends Thread
{
    public static void main(String args[]) {
         A t = new A();
        t.start();
        try 
        {  
            t.join();
        } 
        catch (InterruptedException ie) { }            
        t.run();  
        t.demo();        
    }
        public void run() { System.out.println("0"); }
        public void demo() { System.out.println("1"); }    
    
}

The output is
0
0
1
Can anybody explain me why it is so?
Thanks in advance
Megan

[Barry Gaunt]

The main thread starts the thread t, and then waits
for t to finish (t.join()).
Thread t will do its thing by running the run() method, printing 0.
Thread t finishes and the main thread continues
after the t.join().
The main thread then calls t.run() producing the second 0, and then the main thread calls t.demo() producing the 1.
-Barry
[ August 28, 2002: Message edited by: Barry Gaunt ]