Java如何检查线程组是否已被销毁？
可以使用ThreadGroup.isDestroyed()方法检查线程组及其子组是否已被销毁。
package org.nhooo.example.lang;
public class CheckGroupDestroy {
public static void main(String[] args) {
ThreadGroup grandParent = new ThreadGroup("GrandParent");
ThreadGroup uncle = new ThreadGroup(grandParent, "Uncle");
ThreadGroup parent = new ThreadGroup(grandParent, "Parent");
ThreadGroup son = new ThreadGroup(parent, "Son");
ThreadGroup daughter = new ThreadGroup(parent, "Daughter");
ThreadGroup neighbour = new ThreadGroup("Neighbour");
ThreadGroup[] groupArray = {
grandParent, uncle, parent, son, daughter, neighbour
};
// 销毁“父”组及其所有子组
parent.destroy();
for (ThreadGroup tg : groupArray) {
if (tg.isDestroyed()) {
System.out.println(tg.getName() + " is destroyed");
} else {
System.out.println(tg.getName() + " is not destroyed");
}
}
}
}结果是：
GrandParent is not destroyed Uncle is not destroyed Parent is destroyed Son is destroyed Daughter is destroyed Neighbour is not destroyed