threadgroup

ThreadGroup類的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()方法用于將信息(例如名稱，優先級，線程組等)列出或顯示到有關此線程組的標準輸出。

• 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()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

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

  在顯示有關此線程組的信息時， list()方法不會引發異常。

Syntax:

句法：

public void list();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

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

此方法的返回類型為void –不返回任何內容。

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 derivedThreadGroup base = new ThreadGroup("Base ThreadGroup");ThreadGroup derived = new ThreadGroup(base, "Derived ThreadGroup");// create two threadsThread th1 = new Thread(base, this);Thread th2 = new Thread(derived, this);// By using getName() method is to retrieve the// name of the thread th1System.out.println(th1.getName() + " " + "begins.....");// By using start() method is to start its execution // of thread th1th1.start();// By using getName() method is to retrieve the// name of the thread th2System.out.println(th2.getName() + " " + "begins.....");// By using start() method is to start its execution // of thread th2th2.start();System.out.println();// By using list() method is to// list the contents of the// thread group to the std. outputSystem.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// threadth1.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

輸出量

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]

翻譯自: https://www.includehelp.com/java/threadgroup-list-method-with-example.aspx

threadgroup

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