Multi-threaded programs in java

Question

I'm new to threads in java and I'm trying to test how it works. Unfortunately, things goes as I'm not expecting. threads seems to execute in a not-parallel way. I've tried the sleep function but things stay the same.

The string "aa" does not printed until the thread dies !!! What should I do?

    class ThreadTest1 extends Thread {

    public void start() {
        for (int i=0; i<=100; i+=2) {
            System.out.println(i);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

class Test {

    public static void main(String[] args) throws InterruptedException {
        for (int i=0; i<50; i++) {
            Thread t1=new ThreadTest1();
            t1.start();
            System.out.println("aa");
        }
    }
}

It's often better practice to avoid extending the `Thread` class and instead to create a class that `implements Runnable` and override the `run` method. Then create a thread with `Thread t1 = new Thread(new MyRunnable());`. — assylias, Mar 09 '18 at 13:02

score 1 · Answer 1 · edited Mar 09 '18 at 13:46

1

Please see here for simple example: Defining and Starting a Thread

Basically - you need to implement 'run' method instead of start. and the thread will call run after starting it with start.

edited Mar 09 '18 at 13:46

alex

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answered Mar 09 '18 at 13:02

Maciej

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Multi-threaded programs in java

1 Answers1