threadgroup

ThreadGroup类的list()方法 (ThreadGroup Class list() method)

• list() method is available in java.lang package.

  list()方法在java.lang包中可用。

• list() method is used to list or display information (like name, priority, thread group, etc.) to the standard output about this thread group.

  list()方法用于将信息(例如名称，优先级，线程组等)列出或显示到有关此线程组的标准输出。

• list() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  list()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• list() method does not throw an exception at the time of displaying information about this thread group.

  在显示有关此线程组的信息时， list()方法不会引发异常。

Syntax:

句法：

    public void list();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is void – it returns nothing.

此方法的返回类型为void –不返回任何内容。

Example:

例：

// Java program to demonstrate the example
// of void list() method of ThreadGroup
public class ListThreadGroup implements Runnable {public static void main(String[] args) {ListThreadGroup list_tg = new ListThreadGroup();
list_tg.listTG();
}
public void listTG() {try {// Create two thread group and the named are base
// and derived
ThreadGroup base = new ThreadGroup("Base ThreadGroup");
ThreadGroup derived = new ThreadGroup(base, "Derived ThreadGroup");
// create two threads
Thread th1 = new Thread(base, this);
Thread th2 = new Thread(derived, this);
// By using getName() method is to retrieve the
// name of the thread th1
System.out.println(th1.getName() + " " + "begins.....");
// By using start() method is to start its execution
// of thread th1
th1.start();
// By using getName() method is to retrieve the
// name of the thread th2
System.out.println(th2.getName() + " " + "begins.....");
// By using start() method is to start its execution
// of thread th2
th2.start();
System.out.println();
// By using list() method is to
// list the contents of the
// thread group to the std. output
System.out.println("base.list() :");
base.list();
System.out.println();
System.out.println("derived.list() :");
derived.list();
// By using join() method is to wait the current
// thread till complete execution of another
// thread
th1.join();
th2.join();
} catch (InterruptedException ex) {ex.printStackTrace();
}
}
// Override run()
public void run() {for (int k = 0; k < 100; ++k)
++k;
System.out.println(Thread.currentThread().getName() + " " + "ends.....");
}
}

Output

输出量

Thread-0 begins.....
Thread-0 ends.....
Thread-1 begins.....base.list() :
Thread-1 ends.....
java.lang.ThreadGroup[name=Base ThreadGroup,maxpri=10]java.lang.ThreadGroup[name=Derived ThreadGroup,maxpri=10]derived.list() :
java.lang.ThreadGroup[name=Derived ThreadGroup,maxpri=10]

翻译自: https://www.includehelp.com/java/threadgroup-list-method-with-example.aspx

threadgroup