Java ThreadGroup checkAccess() 方法

2024 年 11 月 11 日 | 阅读 1 分钟

activeCount() 方法是 ThreadGroup 类的一个方法，用于确定当前运行的线程是否有权限修改该线程组。

语法

它不返回任何值。

Exception

SecurityException：如果当前线程不允许访问线程组，则会抛出此异常。

示例

class NewThread extends Thread 
{
    NewThread(String threadname, ThreadGroup tg)
    {
        super(tg, threadname);
    }
    public void run()
    {
        for (int i = 0; i < 10; i++) 
        {
            try
            {
                Thread.sleep(10);
            }
            catch (InterruptedException ex) 
            {
              System.out.println(Thread.currentThread().getName() + " interrupted");
            }
        }
        System.out.println(Thread.currentThread().getName() + " completed executing");
    }
} 
public class ThreadGroupCkeckAccessExp
{
    public static void main(String arg[]) throws InterruptedException, SecurityException
    {
        // creating a ThreadGroup
        ThreadGroup g1 = new ThreadGroup("Parent thread");
        // creating a child ThreadGroup for parent ThreadGroup
        ThreadGroup g2 = new ThreadGroup(g1, "child thread");

        // creating a thread 
        NewThread t1 = new NewThread("Thread-1", g1);
        t1.start();
        // creating another thread 
        NewThread t2 = new NewThread("Thread-2", g1);
        t2.start();
        
        // Check for access permission of current running thread
        g1.checkAccess();
        System.out.println(g1.getName() + " has access");
        g2.checkAccess();
        System.out.println(g2.getName() + " has access");
    }
}

输出

Parent thread has access
child thread has access
Thread-1 finished executing
Thread-2 finished executing

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Java ThreadGroup checkAccess() 方法

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Java ThreadGroup checkAccess() 方法

语法

返回

Exception

示例

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