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Java Thread

Posted on 2007-04-08
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Last Modified: 2010-03-31
Hi Experts,
While using java threads, can a thread be executed before the main is executed, reason?

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Question by:SGIT
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Jaax earned 2000 total points
ID: 18874574
If you mean can user-defined threads be called before main, then the answer is no, as the main method is entry point for a java application and all threads needs to be started from some java method.

If you mean can user-defined threads be completed before main, then the answer is yes, and jvm will only exit after all user-defined threads have been run.

However, you can run a thread without a main method as in the following example, before jvm throws
"java.lang.NoSuchMethodError: main". To avoid the error use System.exit(0) as the last statement

public class Try {
    static {
        System.out.println("Inside Static Block");
        Thread t = new userThread();
        t.start();
        System.exit(0);
    }
}

class userThread extends Thread {
    public void run() {
        System.out.println("Inside the userThread");
    }
}
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