当一个线程执行代码的时候出现异常,则其所持有的锁会自动释放。
package com.cky.bean; /** * Created by chenkaiyang on 2017/12/5. */ public class Service { synchronized public void testMethod() { if (Thread.currentThread().getName().equals("A")) { System.out.println(Thread.currentThread().getName() +" & aaaaaaa"); Integer.parseInt("a"); System.out.println("end"); } else { System.out.println(Thread.currentThread().getName() +" & bbbbb"); } } }
package com.cky.thread; import com.cky.bean.Service; /** * Created by chenkaiyang on 2017/12/5. */ public class ThreadA extends Thread{ private Service service; public ThreadA(Service service) { super(); this.service = service; } @Override public void run() { super.run(); service.testMethod(); } }
package com.cky.thread; import com.cky.bean.Service; /** * Created by chenkaiyang on 2017/12/5. */ public class ThreadB extends Thread{ private Service service; public ThreadB(Service service) { super(); this.service = service; } @Override public void run() { super.run(); service.testMethod(); } }
package com.cky.test; import com.cky.bean.Service; import com.cky.thread.ThreadA; import com.cky.thread.ThreadB; /** * Created by chenkaiyang on 2017/12/2. */ public class Test { public static void main(String[] args){ try { Service service = new Service(); ThreadA threadA = new ThreadA(service); threadA.setName("A"); threadA.start(); Thread.sleep(500); ThreadB threadB = new ThreadB(service); threadB.setName("B"); threadB.start(); } catch (InterruptedException e) { e.printStackTrace(); } } }
D:itjdk1.8injava -Didea.launcher.port=7539 "-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.Test A & aaaaaaa Exception in thread "A" java.lang.NumberFormatException: For input string: "a" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.lang.Integer.parseInt(Integer.java:580) at java.lang.Integer.parseInt(Integer.java:615) at com.cky.bean.Service.testMethod(Service.java:10) at com.cky.thread.ThreadA.run(ThreadA.java:18) B & bbbbb Process finished with exit code 0
线程a出现异常后释放锁,这时线程b可进入执行方法