1. WIKI教程
2. Java.lang包
3. void checkAccess()

void checkAccess()

描述 (Description)

java.lang.Thread.checkAccess()方法确定当前运行的线程是否具有修改此线程的权限。

声明 (Declaration)

以下是java.lang.Thread.checkAccess()方法的声明

public final void checkAccess()

参数 (Parameters)

NA

返回值 (Return Value)

此方法不返回任何值。

异常 (Exception)

SecurityException - 如果不允许当前线程访问此线程。

例子 (Example)

以下示例显示了java.lang.Thread.checkAccess（）方法的用法。

package com.iowiki;
import java.lang.*;
public class ThreadDemo {
   public static void main(String args[]) {
      new ThreadClass("A");
      Thread t = Thread.currentThread();
      try {
         /* determines if the currently running thread has permission to 
            modify this thread */
         t.checkAccess();
         System.out.println("You have permission to modify");
      }
      /* if the current thread is not allowed to access this thread, then it 
         result in throwing a SecurityException. */
      catch(Exception e) {
         System.out.println(e);
      }
   }
}
class ThreadClass implements Runnable {
   Thread t;
   String str;
   ThreadClass(String str) {
      this.str = str;
      t = new Thread(this);
      // this will call run() function
      t.start();    
   }
   public void run() {
      System.out.println("This is run() function");
   }
} 

让我们编译并运行上面的程序，这将产生以下结果 -

You have permission to modify
This is run() function