test for wait()

gistfile1.java

public class LoadingActivity extends Activity {
    final byte[] lock = new byte[0];

    final int goal = 3;
    volatile int task = 0;

    @Override
    protected final void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final long time = SystemClock.elapsedRealtimeNanos();
        new ViewPager(this);
        new Toolbar(this);
        new ActionMenuView(this);

//        synchronized (lock) {
//            startWork("TEST");
//            try {
//                lock.wait();
//            } catch (InterruptedException e) {
//            }
//        }

        Log.d("time", "" + (SystemClock.elapsedRealtimeNanos() - time));
    }

    public void startWork(final String task_info) {
        task = 0;
        new Thread(new Runnable() {
            @Override
            public void run() {
                new ViewPager(LoadingActivity.this);
                task++;
                if (task >= goal) {
                    Log.d(Thread.currentThread().getName(), "finish task " + task_info);
                    synchronized (lock) {
                        lock.notify();
                    }
                }
            }
        }, "worker").start();
        new Thread(new Runnable() {
            @Override
            public void run() {
                new Toolbar(LoadingActivity.this);
                task++;
                if (task >= goal) {
                    Log.d(Thread.currentThread().getName(), "finish task " + task_info);
                    synchronized (lock) {
                        lock.notify();
                    }
                }
            }
        }, "worker").start();
        new Thread(new Runnable() {
            @Override
            public void run() {
                new ActionMenuView(LoadingActivity.this);
                task++;
                if (task >= goal) {
                    Log.d(Thread.currentThread().getName(), "finish task " + task_info);
                    synchronized (lock) {
                        lock.notify();
                    }
                }
            }
        }, "worker").start();
    }
}