Java多線程-線程按序交替

線程按序交替

編寫一個程式，開啟三個線程，這三個線程的ID分别為A、B、C，每個線程将自己的ID在螢幕上列印10遍，要求輸出的結果必須按順序顯示，如:ABCABCABC……依次遞歸。

使用Condition進行線程間通信即可(也可以使用wait()和notify()):

package JavaThread;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * Created by yangl on 2017/7/6.
 * 編寫一個程式，開啟三個線程，這三個線程的ID分别為A、B、C，每個線程将自己的ID在螢幕上列印10遍，
 * 要求輸出的結果必須按順序顯示，如:ABCABCABC......依次遞歸。
 */
public class ABCABCThread {

    private int number = ;//目前正在執行線程的标記
    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    public void loopA(int totalLoop)
    {
        lock.lock();
        try {
            //判斷number
            if (number != )
            {
                condition1.await();
            }

            for (int i = ;i <= ;i++)
            {
                System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);
            }

            number = ;
            condition2.signal();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

        finally {
            lock.unlock();
        }
    }

    public void loopB(int totalLoop)
    {
        lock.lock();
        try {
            //判斷number
            if (number != )
            {
                condition2.await();
            }

            for (int i = ;i <= ;i++)
            {
                System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);
            }

            number = ;
            condition3.signal();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

        finally {
            lock.unlock();
        }
    }

    public void loopC(int totalLoop)
    {
        lock.lock();
        try {
            //判斷number
            if (number != )
            {
                condition3.await();
            }

            for (int i = ;i <= ;i++)
            {
                System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);
            }

            number = ;
            condition1.signal();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

        finally {
            lock.unlock();
        }
    }

    public static void main(String [] argsd){
        ABCABCThread at = new ABCABCThread();
        new Thread(new Runnable()
        {
            @Override
            public void run()
            {
                for (int i = ;i < ;i++){
                    at.loopA(i);
                }
            }
        },"A").start();

        new Thread(new Runnable()
        {
            @Override
            public void run()
            {
                for (int i = ;i < ;i++){
                    at.loopB(i);
                }
            }
        },"B").start();

        new Thread(new Runnable()
        {
            @Override
            public void run()
            {
                for (int i = ;i < ;i++){
                    at.loopC(i);
                    System.out.println("-----------------------------------------------");
                }
            }
        },"C").start();
    }
}