JavaSE --- --- multi-threaded thread groups

1 Overview

　　　　　　Use the 1.1 Java thread group ThreadGroup representation can be classified management of a number of threads;

　　　　　　　　　　Java programs run directly on the thread group is controlled to control the thread group is equivalent to simultaneously control the set of threads;

　　　　　　　　　　Once the thread join a group, you can not change the group to which it belongs, until death;