JoinDemo.java Source code

Introduction

Here is the source code for JoinDemo.java

Source

public class JoinDemo extends Object {
    public static Thread createThread(String name, long napTime) {
        final long sleepTime = napTime;

        Runnable r = new Runnable() {
            public void run() {
                try {
                    print("in run() - entering");
                    Thread.sleep(sleepTime);
                } catch (InterruptedException x) {
                    print("interrupted!");
                } finally {
                    print("in run() - leaving");
                }
            }
        };

        Thread t = new Thread(r, name);
        t.start();

        return t;
    }

    private static void print(String msg) {
        String name = Thread.currentThread().getName();
        System.out.println(name + ": " + msg);
    }

    public static void main(String[] args) {
        Thread[] t = new Thread[3];

        t[0] = createThread("thread A", 2000);
        t[1] = createThread("thread B", 1000);
        t[2] = createThread("thread C", 3000);

        for (int i = 0; i < t.length; i++) {
            try {
                String idxStr = "thread[" + i + "]";
                String name = "[" + t[i].getName() + "]";

                print(idxStr + ".isAlive()=" + t[i].isAlive() + " " + name);
                print("about to do: " + idxStr + ".join() " + name);

                long start = System.currentTimeMillis();
                t[i].join(); // wait for the thread to die
                long stop = System.currentTimeMillis();

                print(idxStr + ".join() - took " + (stop - start) + " ms " + name);
            } catch (InterruptedException x) {
                print("interrupted waiting on #" + i);
            }
        }
    }
}