GUC-8 小演练

By admin in 编程 on 2019年9月24日
import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;/* * 编写一个程序,开启 3 个线程,这三个线程的 ID 分别为 A、B、C,每个线程将自己的 ID 在屏幕上打印 10 遍,要求输出的结果必须按顺序显示。 *    如:ABCABCABC…… 依次递归 */public class TestABCAlternate {        public static void main(String[] args) {        AlternateDemo ad = new AlternateDemo();                new Thread(new Runnable() {            @Override            public void run() {                                for (int i = 1; i <= 20; i++) {                    ad.loopA;                }                            }        }, "A").start();                new Thread(new Runnable() {            @Override            public void run() {                                for (int i = 1; i <= 20; i++) {                    ad.loopB;                }                            }        }, "B").start();                new Thread(new Runnable() {            @Override            public void run() {                                for (int i = 1; i <= 20; i++) {                    ad.loopC;                                        System.out.println("-----------------------------------");                }                            }        }, "C").start();    }}class AlternateDemo{        private int number = 1; //当前正在执行线程的标记        private Lock lock = new ReentrantLock();    private Condition condition1 = lock.newCondition();    private Condition condition2 = lock.newCondition();    private Condition condition3 = lock.newCondition();        /**     * @param totalLoop : 循环第几轮     */    public void loopA(int totalLoop){        lock.lock();                try {            //1. 判断            if(number != 1){                condition1.await();            }                        //2. 打印            for (int i = 1; i <= 1; i++) {                System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);            }                        //3. 唤醒            number = 2;            condition2.signal();        } catch (Exception e) {            e.printStackTrace();        } finally {            lock.unlock();        }    }        public void loopB(int totalLoop){        lock.lock();                try {            //1. 判断            if(number != 2){                condition2.await();            }                        //2. 打印            for (int i = 1; i <= 1; i++) {                System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);            }                        //3. 唤醒            number = 3;            condition3.signal();        } catch (Exception e) {            e.printStackTrace();        } finally {            lock.unlock();        }    }        public void loopC(int totalLoop){        lock.lock();                try {            //1. 判断            if(number != 3){                condition3.await();            }                        //2. 打印            for (int i = 1; i <= 1; i++) {                System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);            }                        //3. 唤醒            number = 1;            condition1.signal();        } catch (Exception e) {            e.printStackTrace();        } finally {            lock.unlock();        }    }    }

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