threadgroup_Java ThreadGroup类的checkAccess（）方法和示例

threadgroup

ThreadGroup类的checkAccess()方法 (ThreadGroup class checkAccess() method)

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

  checkAccess()方法在java.lang包中可用。

• checkAccess() method is used to check whether the currently running thread has permission to update the thread group or not.

  checkAccess()方法用于检查当前正在运行的线程是否具有更新线程组的权限。

• checkAccess() method is not a static method so it is not accessible with the class name (i.e. this method is accessible with the class object only).

  checkAccess()方法不是静态方法，因此无法使用类名进行访问(即，只能使用类对象访问此方法)。

• checkAccess() method is a final method so it is not overridable (i.e. this method is not overridable in child class).

  checkAccess()方法是最终方法，因此它不可重写(即，该方法在子类中不可重写)。

• This method may throw an exception at the time of accessing a thread group.

  访问线程组时，此方法可能会引发异常。

  SecurityException: In this exception when the current thread is not authorized to access the thread group when the security manager exists.

  SecurityException：在存在安全管理器的情况下，当当前线程无权访问线程组时，发生此异常。

Syntax:

句法：

public final void checkAccess();

Parameter(s):

参数：

• This method does not accept any parameter.

  此方法不接受任何参数。

Return value:

返回值：

The return type of this method is void, it does not return anything.

此方法的返回类型为void ，它不返回任何内容。

Example:

例：

// Java program to demonstrate the example of // checkAccess () method of ThreadGroup Class.import java.lang.*;class CheckAccess extends Thread {// Override run() of Thread classpublic void run() {String name = Thread.currentThread().getName();System.out.println(name + " " + "finish executing");} }public class Main {public static void main(String[] args) {CheckAccess ca = new CheckAccess();try {// We are creating an object of ThreadGroup classThreadGroup tg1 = new ThreadGroup("ThreadGroup 1");ThreadGroup tg2 = new ThreadGroup("ThreadGroup 2");// We are creating an object of Thread class and // we are assigning the ThreadGroup of both the threadThread th1 = new Thread(tg1, ca, "First Thread");Thread th2 = new Thread(tg2, ca, "Second Thread");// Calling start() method with Thread class object // of Thread classth1.start();th2.start();// Here we are checking access of ThreadGrouptry {tg1.checkAccess();System.out.println(tg1.getName() + " " + "has access");tg2.checkAccess();System.out.println(tg2.getName() + " " + "has access");} catch (SecurityException se) {System.out.println(se.getMessage());}th1.join();th2.join();} catch (Exception ex) {System.out.println(ex.getMessage());}} }

Output

输出量

E:\Programs>javac Main.java E:\Programs>java Main ThreadGroup 1 has access ThreadGroup 2 has access First Thread finish executing Second Thread finish executing

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

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