Question

When i start some thread in my program, everything else is stopped.

This is my Thread code…

static Thread b1 = new Thread(new Builders());
b1.run();
System.out.println("done");

This is the class Builders.

public class Builders implements Runnable {

    static boolean busy=false;
    Random r = new Random();

    public void run() {
        try{
            busy=true;
            System.out.println("ready");
            Thread.sleep(9999);
            busy=false;
            System.out.println("done");
        }
        catch(Exception e){
        }
    }
}

When I run the program , the thread is started and the program wait for the end of the thread. I thought the main point of the threads is that the code can run simultaneously. Could someone please help me understand what I’m doing wrong.

Answer 1

That’s because threads are started with start(), not run(), which simply calls the run method on the current thread. So it should be:

static Thread b1 = new Thread(new Builders());
b1.start();
System.out.println("done");