ThreadGroup类的list()方法用于显示有关线程组的信息。它仅适用于调试。
语法
public void list()
返回
此方法不返回任何值。
示例
class List extends Thread
{
List(String threadname, ThreadGroup tgob)
{
super(tgob, threadname);
}
public void run()
{
for (int i = 0; i < 10; i++)
{
try
{
Thread.sleep(10);
}
catch (InterruptedException ex){
}
}
System.out.println(Thread.currentThread().getName() + " completed executing");
}
}
public class ThreadGroupListExp
{
public static void main(String arg[]) throws InterruptedException,
SecurityException, Exception
{
// creating the thread group
ThreadGroup tg1 = new ThreadGroup("Parent thread");
ThreadGroup tg2 = new ThreadGroup(tg1, "Child thread");
// creating a thread
List t1 = new List("Thread-1", tg1);
System.out.println(t1.getName() +" starts");
t1.start();
// creating an another thread
List t2 = new List("Thread-2", tg1);
System.out.println(t2.getName() +" starts");
t2.start();
// listing contents of parent ThreadGroup
System.out.println("\\nListing parentThreadGroup: " + tg1.getName() + ":");
// prints information about this thread group to the standard output
tg1.list();
}
}
执行上面示例代码，得到以下结果：
Thread-1 starts
Thread-2 starts
Listing parentThreadGroup: Parent thread:
java.lang.ThreadGroup[name=Parent thread,maxpri=10]
Thread[Thread-1,5,Parent thread]
Thread[Thread-2,5,Parent thread]
java.lang.ThreadGroup[name=Child thread,maxpri=10]
Thread-1 completed executing
Thread-2 completed executing
