package com.cky.bean; /** * Created by chenkaiyang on 2017/12/6. */ public class ObjectService { public void serviceMethodA(){ synchronized (this) { try { System.out.println("a begin time="+System.currentTimeMillis()); Thread.sleep(2000); System.out.println("a end time="+System.currentTimeMillis()); } catch (InterruptedException e) { e.printStackTrace(); } } } public void serviceMethodB(){ synchronized (this) { System.out.println("b begin time="+System.currentTimeMillis()); System.out.println("b end time="+System.currentTimeMillis()); } } }
package com.cky.thread; import com.cky.bean.ObjectService; /** * Created by chenkaiyang on 2017/12/5. */ public class ThreadA extends Thread{ private ObjectService service; public ThreadA(ObjectService service) { super(); this.service = service; } @Override public void run() { super.run(); service.serviceMethodA(); } }
package com.cky.thread; import com.cky.bean.ObjectService; /** * Created by chenkaiyang on 2017/12/5. */ public class ThreadB extends Thread{ private ObjectService service; public ThreadB(ObjectService service) { super(); this.service = service; } @Override public void run() { super.run(); service.serviceMethodB(); } }
package com.cky.test; import com.cky.bean.ObjectService; import com.cky.thread.ThreadA; import com.cky.thread.ThreadB; /** * Created by chenkaiyang on 2017/12/6. */ public class Test2 { public static void main(String[] args) { ObjectService objectService = new ObjectService(); ThreadA a = new ThreadA(objectService); a.setName("a"); ThreadB b = new ThreadB(objectService); b.setName("b"); a.start(); b.start(); } }
D:itjdk1.8injava -Didea.launcher.port=7541 "-Didea.launcher.bin.path=D:itideaIntelliJ IDEA 2016.3.3in" -Dfile.encoding=UTF-8 -classpath "D:itjdk1.8jrelibcharsets.jar;D:itjdk1.8jrelibdeploy.jar;D:itjdk1.8jrelibextaccess-bridge-64.jar;D:itjdk1.8jrelibextcldrdata.jar;D:itjdk1.8jrelibextdnsns.jar;D:itjdk1.8jrelibextjaccess.jar;D:itjdk1.8jrelibextjfxrt.jar;D:itjdk1.8jrelibextlocaledata.jar;D:itjdk1.8jrelibext ashorn.jar;D:itjdk1.8jrelibextsunec.jar;D:itjdk1.8jrelibextsunjce_provider.jar;D:itjdk1.8jrelibextsunmscapi.jar;D:itjdk1.8jrelibextsunpkcs11.jar;D:itjdk1.8jrelibextzipfs.jar;D:itjdk1.8jrelibjavaws.jar;D:itjdk1.8jrelibjce.jar;D:itjdk1.8jrelibjfr.jar;D:itjdk1.8jrelibjfxswt.jar;D:itjdk1.8jrelibjsse.jar;D:itjdk1.8jrelibmanagement-agent.jar;D:itjdk1.8jrelibplugin.jar;D:itjdk1.8jrelib esources.jar;D:itjdk1.8jrelib t.jar;F:springboot hreaddemooutproduction hreaddemo;D:itideaIntelliJ IDEA 2016.3.3libidea_rt.jar" com.intellij.rt.execution.application.AppMain com.cky.test.Test2 a begin time=1512569404772 a end time=1512569406772 b begin time=1512569406772 b end time=1512569406772
结果分析:当一个线程访问object的一个同步代码块时,其他线程对同一个object的所有其他的同步代码块将被阻塞,这说明同步代码块使用的是对象监视