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37 lines (31 loc) · 1.43 KB
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package com.brianway.learning.java.multithread.supplement.example2;
/**
* Created by Brian on 2016/4/17.
*/
/**
* p288
* 获取根线程组
* JVM根线程组就是system
*/
public class Run2_getGroupParent {
public static void main(String[] args) {
System.out.println("线程：" + Thread.currentThread().getName()
+ " 所在的线程组名为：" + Thread.currentThread().getThreadGroup().getName());
System.out.println("main线程所在的线程组的父线程组名为："
+ Thread.currentThread().getThreadGroup().getParent().getName());
System.out.println("main线程所在的线程组的父线程组的父线程组名为："
+ Thread.currentThread().getThreadGroup().getParent().getParent().getName());
}
}
/*
输出：
线程：main 所在的线程组名为：main
main线程所在的线程组的父线程组名为：system
Exception in thread "main" java.lang.NullPointerException
at com.brianway.learning.java.multithread.supplement.example2.Run2_getGroupParent.main(Run2_getGroupParent.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
*/