2.1.8同步不具有继承性

同步不可以继承

package com.cky.bean;

/**
 * Created by chenkaiyang on 2017/12/5.
 */
public class Father {
    synchronized public void opeFatherMethod() {
        try {
            System.out.println("main begin");
            Thread.sleep(5000);
            System.out.println("main end");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

package com.cky.bean;

/**
 * Created by chenkaiyang on 2017/12/5.
 */
public class Son extends  Father{
    @Override
    public  void opeFatherMethod() {
        try {
            System.out.println("son begin");
            Thread.sleep(5000);
            System.out.println("son end");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

package com.cky.thread;

import com.cky.bean.Son;

/**
 * Created by chenkaiyang on 2017/12/5.
 */
public class ThreadA extends Thread{
    private Son service;
    public ThreadA(Son service) {
        super();
        this.service = service;
    }

    @Override
    public void run() {
        super.run();
        service.opeFatherMethod();
    }
}

package com.cky.thread;

import com.cky.bean.Son;

/**
 * Created by chenkaiyang on 2017/12/5.
 */
public class ThreadB extends  Thread{
    private Son service;
    public ThreadB(Son service) {
        super();
        this.service = service;
    }

    @Override
    public void run() {
        super.run();
        service.opeFatherMethod();
    }
}

package com.cky.test;

import com.cky.bean.Son;
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){
            Son service = new Son();
            ThreadA threadA = new ThreadA(service);
            threadA.setName("A");
            threadA.start();
            ThreadB threadB = new ThreadB(service);
            threadB.setName("B");
            threadB.start();



    }
}

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
son begin
son begin
son end
son end

Process finished with exit code 0

从结果可以分析，同步不能继承，所以还得再子类加上synchoized关键字才行。