java parallel programing code

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package newpackage;

/**
 *
 * @author lizheng
 */
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.Condition;

public class ThreadTest {

    private static Lock lock = new ReentrantLock();
    private static Condition subThreadCondition = lock.newCondition();
    private static boolean bBhouldSubThread = false;

    public static void main(String[] args) {
        ExecutorService threadPool = Executors.newFixedThreadPool(3);
        threadPool.execute(new Runnable() {
            public void run() {
                for (int i = 0; i < 50; i++) {
                    lock.lock();
                    try {
                        if (!bBhouldSubThread) {
                            subThreadCondition.await();
                        }
                        for (int j = 0; j < 10; j++) {
                            System.out.println(Thread.currentThread().getName() + ",j=" + j);
                        }
                        bBhouldSubThread = false;
                        subThreadCondition.signal();
                    } catch (Exception e) {
                    } finally {
                        lock.unlock();
                    }
                }
            }

        });
        threadPool.shutdown();
        for (int i = 0; i < 50; i++) {
            lock.lock();
            try {
                if (bBhouldSubThread) {
                    subThreadCondition.await();
                }
                for (int j = 0; j < 10; j++) {
                    System

.out.println(Thread.currentThread().getName() + ",j=" + j);
                }
                bBhouldSubThread = true;
                subThreadCondition.signal();
            } catch (Exception e) {
            } finally {
                lock.unlock();
            }
        }
    }
}