threadgroup_Java ThreadGroup list()方法与示例
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(yōu)先級(jí),線程組等)列出或顯示到有關(guān)此線程組的標(biāo)準(zhǔn)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(tài)方法,只能通過類對(duì)象訪問,如果嘗試使用類名稱訪問該方法,則會(huì)收到錯(cuò)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(guān)此線程組的信息時(shí), list()方法不會(huì)引發(fā)異常。
Syntax:
句法:
public void list();Parameter(s):
參數(shù):
It does not accept any parameter.
它不接受任何參數(shù)。
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(nèi)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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