1 package com.java.concurrent;
2
3 import java.util.concurrent.locks.Condition;
4 import java.util.concurrent.locks.Lock;
5 import java.util.concurrent.locks.ReentrantLock;
6
7 /**
8 * 使用多线程的方式进行轮循打印ABCABC
9 * @author fliay
10 *
11 */
12 public class TestABCAlternate {
13
14 public static void main(String[] args) {
15 final AlternateDemo ad = new AlternateDemo();
16 new Thread(new Runnable() {
17
18 public void run() {
19 for(int i = 1;i<10;i++){
20 try {
21 ad.loopA(i);
22 } catch (InterruptedException e) {
23 // TODO Auto-generated catch block
24 e.printStackTrace();
25 }
26 }
27 }
28 },"线程1").start();
29
30 new Thread(new Runnable() {
31
32 public void run() {
33 for(int i = 1;i<10;i++){
34 try {
35 ad.loopB(i);
36 } catch (InterruptedException e) {
37 // TODO Auto-generated catch block
38 e.printStackTrace();
39 }
40 }
41 }
42 },"线程2").start();
43
44
45 new Thread(new Runnable() {
46
47 public void run() {
48 for(int i = 1;i<10;i++){
49 try {
50 ad.loopC(i);
51 } catch (InterruptedException e) {
52 // TODO Auto-generated catch block
53 e.printStackTrace();
54 }
55 }
56 }
57 },"线程3").start();
58
59
60
61 }
62
63
64
65 }
66
67
68 class AlternateDemo{
69
70 private int number=1;//当前正在执行的线程标记
71
72 private Lock lock = new ReentrantLock();
73
74 private Condition condition1 = lock.newCondition();
75 private Condition condition2 = lock.newCondition();
76 private Condition condition3 = lock.newCondition();
77
78 public void loopA(int totalLoop) throws InterruptedException{
79 lock.lock();
80 try{
81 //1.判断
82 if(number!=1){
83 condition1.await();
84 }
85 //2.打印
86 System.out.println(Thread.currentThread().getName()+":A"+"-"+totalLoop);
87
88 //3.唤醒
89 number=2;
90 condition2.signal();
91 }finally{
92 lock.unlock();
93 }
94 }
95
96 public void loopB(int totalLoop) throws InterruptedException{
97 lock.lock();
98 try{
99 //1.判断
100 if(number!=2){
101 condition2.await();
102 }
103 //2.打印
104 System.out.println(Thread.currentThread().getName()+":B"+"-"+totalLoop);
105
106 //3.唤醒
107 number=3;
108 condition3.signal();
109 }finally{
110 lock.unlock();
111 }
112 }
113
114
115 public void loopC(int totalLoop) throws InterruptedException{
116 lock.lock();
117 try{
118 //1.判断
119 if(number!=3){
120 condition3.await();
121 }
122 //2.打印
123 System.out.println(Thread.currentThread().getName()+":C"+"-"+totalLoop);
124
125 //3.唤醒
126 number=1;
127 condition1.signal();
128 }finally{
129 lock.unlock();
130 }
131 }
132
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142
143
144 }
