这篇文章主要介绍了Java线程使用同步锁交替执行打印奇数偶数的方法。小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
对同一个对象进行多线程操作时，如何保证线程执行结果的一致性？我们需要对线程操作对象加同步锁。（这是一道面试题）
需求描述
1-20个数字
A线程打印奇数：1，3，5，7，9，11，13，15，17，19
B线程打印偶数：2，4，6，8，10，12，14，16，18，20
C线程在AB两个线程执行完了之后打印结果：“success”。
线程代码实现
Num.java
package com.boonya.thread.test; /** * @ClassName: Num * @Description: TODO(加锁计算对象) * @author: pengjunlin * @motto: 学习需要毅力，那就秀毅力 * @date 2019-01-14 22:47 */ public class Num { int value=1; } AThread.java
package com.boonya.thread.test; /** * @ClassName: AThread * @Description: TODO(奇数线程) * @author: pengjunlin * @motto: 学习需要毅力，那就秀毅力 * @date 2019-01-14 22:26 */ public class AThread implements Runnable{ Num num; public AThread(Num num){ this.num=num; } public void run() { while (num.value<20){ synchronized (num){ if(num.value%2!=0){ System.out.println("AThread:"+ num.value); num.value++; } } } } } BThread.java
package com.boonya.thread.test; /** * @ClassName: BThread * @Description: TODO(偶数线程) * @author: pengjunlin * @motto: 学习需要毅力，那就秀毅力 * @date 2019-01-14 22:26 */ public class BThread implements Runnable { Num num; public BThread(Num num){ this.num=num; } public void run() { while (num.value<=20){ synchronized (num){ if(num.value%2==0){ System.out.println("BThread:"+ num.value); num.value++; } } } } }CThread.java
package com.boonya.thread.test; /** * @ClassName: CThread * @Description: TODO(等待结果线程) * @author: pengjunlin * @motto: 学习需要毅力，那就秀毅力 * @date 2019-01-14 22:26 */ public class CThread implements Runnable { Num num; public CThread(Num num){ this.num=num; } public void run() { while (num.value<20){ try { Thread.sleep(1); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println("CThread:success!"); } }MainTest.java
package com.boonya.thread.test; import java.util.ArrayList; import java.util.List; /** * @ClassName: MainTest * @Description: TODO(线程测试) * @author: pengjunlin * @motto: 学习需要毅力，那就秀毅力 * @date 2019-01-14 21:54 */ public class MainTest { public static void main(String[] args) { Num num=new Num(); Thread a=new Thread(new AThread(num)); Thread b=new Thread(new BThread(num)); Thread c=new Thread(new CThread(num)); a.start(); b.start(); c.start(); } } 测试结果
"C:\Program Files\Java\jdk1.8.0_121\bin\java" "-javaagent:C:\Users\boonya\AppData\Roaming\JetBrains\IntelliJ IDEA 2017.2.5\lib\idea_rt.jar=51911:C:\Users\boonya\AppData\Roaming\JetBrains\IntelliJ IDEA 2017.2.5\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_121\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\rt.jar;C:\Users\boonya\Desktop\JavaAlgorithm\target\test-classes;C:\Users\boonya\Desktop\JavaAlgorithm\target\classes" com.boonya.thread.test.MainTest AThread:1 BThread:2 AThread:3 BThread:4 AThread:5 BThread:6 AThread:7 BThread:8 AThread:9 BThread:10 AThread:11 BThread:12 AThread:13 BThread:14 AThread:15 BThread:16 AThread:17 BThread:18 AThread:19 BThread:20 CThread:success! Process finished with exit code 0
注意：synchronized 作为方法块使用时需要只能对对象加锁，不能是常用数据类型。
AB线程改进:使用线程等待和通知
AThread.java
package com.boonya.thread.test; /** * @ClassName: AThread * @Description: TODO(奇数线程) * @author: pengjunlin * @motto: 学习需要毅力，那就秀毅力 * @date 2019-01-14 22:26 */ public class AThread implements Runnable{ Num num; public AThread(Num num){ this.num=num; } public以上就是Java线程使用同步锁交替执行打印奇数偶数的方法的详细内容，更多请关注0133技术站其它相关文章！
