Simple thread program doesn't work

Question

Hi, I'm a novice java programmer towards thread. And I'm stuck on this simple Java program

public class Multi extends Thread{  
    public void run() { 
        try{ 
            System.out.println("running...");
        }
        catch(Exception e){ 
            System.out.print(e);   
        }
    } 
    public static void main(String[] args){  
        Multi t1=new Multi();  
        t1.run();//fine, but does not start a separate call stack  
    }  
}

Answers already made, buy I must admit having some fun about so much messed up in so short code — Piotr Müller, Mar 31 '14 at 10:44

Reimeus · Accepted Answer · 2014-03-31T10:39:36.987

2

Threads are started using the start method. Calling t1.run() method just synchronously executes the run method within the same Thread.

t1.start();

Read: Defining and Starting a Thread

edited Mar 31 '14 at 10:39

answered Mar 31 '14 at 10:32

Reimeus

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Still it shows me this kind of error "Could not find the main class: Multi." – Parth Mar 31 '14 at 10:35
How are you running the application? – Reimeus Mar 31 '14 at 10:36
Need more info here. Is the class in a package? What is the run command? – Reimeus Mar 31 '14 at 10:37
There's no such thing. I just picked up the program from a website, here http://www.javatpoint.com/what-if-we-call-run()-method-directly – Parth Mar 31 '14 at 10:39
Did you _compile_ the class before running it? – Reimeus Mar 31 '14 at 10:43
Allright...everything here is fair and good...I don't know why it didn't run earlier, but now when i tried running it on a different pc i worked out perfectly well. Strange!!! – Parth Mar 31 '14 at 11:22
you're welcome - on a related note, do read [`implements Runnable vs. extends Thread`](http://stackoverflow.com/questions/541487/implements-runnable-vs-extends-thread) – Reimeus Mar 31 '14 at 11:35

score 1 · Answer 2 · answered Mar 31 '14 at 10:35

1

Java threads are triggered by the following method:

t1.start() // This starts a new thread

While the following:

t1.run();// This calls the run method in the same thread

answered Mar 31 '14 at 10:35

GingerHead

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score 1 · Answer 3 · answered Mar 31 '14 at 10:36

1

Threads Are Started With Thread.Start()

And Look on Thread Life Cycle

enter image description here

answered Mar 31 '14 at 10:36

Rakesh KR

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score 0 · Answer 4 · answered Mar 31 '14 at 10:32

0

t1.run();// just calls the run method (like any other method) in the same thread.

use t1.start() // starts a new thread.

answered Mar 31 '14 at 10:32

TheLostMind

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Simple thread program doesn't work

4 Answers4