1.10.1优先级具有继承特性

jdk中有3个常量来定义优先级

public final static int MIN_PRIOPITY = 1;

public final static int NORM_PRIOPITY = 5;

public final static int MAX_PRIOPITY = 10;

在java中，线程的优先级具有继承性，比如A线程启动B线程，则B线程的优先级和A时一样的

测试

package com.cky.demo;

/**
 * Created by edison on 2017/12/3.
 */
public class MyThread1 extends Thread{
    @Override
    public void run() {
        super.run();
        System.out.println("线程1:"+ this.getPriority());
        Thread2 thread2 = new Thread2();
        thread2.start();
    }
}

package com.cky.demo;

/**
 * Created by edison on 2017/12/3.
 */
public class Thread2 extends Thread {
    @Override
    public void run() {
        System.out.println("线程2："+ this.getPriority());
    }
}

package com.cky.demo;

/**
 * Created by edison on 2017/12/3.
 */
public class TestDemo {
    public static void main(String[] args) {
        System.out.println("main " + Thread.currentThread().getPriority());
        //Thread.currentThread().setPriority(6);
        System.out.println("main " + Thread.currentThread().getPriority());
        MyThread1 th = new MyThread1();
        th.start();
    }
}

C:itsoftjdkinjava -Didea.launcher.port=7539 "-Didea.launcher.bin.path=C:itsoftideaIntelliJ IDEA 2016.3.3in" -Dfile.encoding=UTF-8 -classpath "C:itsoftjdkjrelibcharsets.jar;C:itsoftjdkjrelibdeploy.jar;C:itsoftjdkjrelibextaccess-bridge-32.jar;C:itsoftjdkjrelibextcldrdata.jar;C:itsoftjdkjrelibextdnsns.jar;C:itsoftjdkjrelibextjaccess.jar;C:itsoftjdkjrelibextjfxrt.jar;C:itsoftjdkjrelibextlocaledata.jar;C:itsoftjdkjrelibext
ashorn.jar;C:itsoftjdkjrelibextsunec.jar;C:itsoftjdkjrelibextsunjce_provider.jar;C:itsoftjdkjrelibextsunmscapi.jar;C:itsoftjdkjrelibextsunpkcs11.jar;C:itsoftjdkjrelibextzipfs.jar;C:itsoftjdkjrelibjavaws.jar;C:itsoftjdkjrelibjce.jar;C:itsoftjdkjrelibjfr.jar;C:itsoftjdkjrelibjfxswt.jar;C:itsoftjdkjrelibjsse.jar;C:itsoftjdkjrelibmanagement-agent.jar;C:itsoftjdkjrelibplugin.jar;C:itsoftjdkjrelib
esources.jar;C:itsoftjdkjrelib
t.jar;C:多线程核心技术第一章outproduction第一章;C:itsoftideaIntelliJ IDEA 2016.3.3libidea_rt.jar" com.intellij.rt.execution.application.AppMain com.cky.demo.TestDemo
main 5
main 5
线程1:5
线程2：5

当去掉注释

package com.cky.demo;

/**
 * Created by edison on 2017/12/3.
 */
public class TestDemo {
    public static void main(String[] args) {
        System.out.println("main " + Thread.currentThread().getPriority());
        Thread.currentThread().setPriority(6);
        System.out.println("main " + Thread.currentThread().getPriority());
        MyThread1 th = new MyThread1();
        th.start();
    }
}

main 5
main 6
线程1:6
线程2：6