java.lang.Thread.checkAccess()方法實例
java.lang.Thread.checkAccess() 方法確定當前運行的線程是否有權修改該線程。
聲明
以下是java.lang.Thread.checkAccess()方法的聲明
public final void checkAccess()
參數
-
NA
返回值
此方法不返回任何值。
異常
-
SecurityException -- 如果當前線程不允許訪問該線程。
例子
下麵的例子顯示java.lang.Thread.checkAccess()方法的使用。
package com.yiibai; 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"); } }
讓我們來編譯和運行上麵的程序,這將產生以下結果:
You have permission to modify This is run() function