2.1.7出现异常，锁自动释放

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