Java SecurityManager checkExit（）方法与示例

SecurityManager类的checkExit()方法 (SecurityManager Class checkExit() method)

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

  checkExit()方法在java.lang包中可用。

• checkExit() method calls checkPermission with RuntimePermission("exitVM" + "exit_status") it exits successfully when the given argument value is 0 otherwise it exits unsuccessfully when the given argument value is not equal to 0.

  checkExit()方法使用RuntimePermission(“ exitVM” +“ exit_status”)调用checkPermission，当给定参数值为0时成功退出，否则当给定参数值不等于0时成功退出。

• checkExit() 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.

  checkExit()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• checkExit() method may throw an exception at the time of thread termination.

  在线程终止时， checkExit()方法可能会引发异常。

  SecurityException – This exception may throw when the calling thread is not allowed to stop the JVM with the given status and it is called for the current security manager by using the exit() method of Runtime.

  SecurityException-如果不允许调用线程以给定状态停止JVM，并且使用Runtime的exit()方法为当前安全管理器调用此异常，则可能引发此异常。

Syntax:

句法：

    public void checkExit(int exit_status);

Parameter(s):

参数：

• int exit_status – represents the exit status of the thread.

  int exit_status –表示线程的退出状态。

Return value:

返回值：

The return type of this method is void, it returns nothing.

此方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example 
// of void checkExit(int exit_status)
// method of SecurityManager 

public class CheckExit extends SecurityManager {
     
    // Override checkExit() of SecurityManager
    public void checkExit(int exit_status) {
     
        throw new SecurityException("Restricted.. ");
    }

    public static void main(String[] args) {
     
        // By using setProperty() method is to set the policy property 
        // with security manager
        System.setProperty("java.security.policy", "file:/C:/java.policy");

        // Instantiating a SecurityManager object
        SecurityManager smgr = new SecurityManager();

        // By using setSecurityManager() method is to set the
        // security manager
        System.setSecurityManager(smgr);

        // By using checkExit(4) method is to exit
        // process with a integer value
        smgr.checkExit(4);

        // Display the message
        System.out.println("Not Restricted..");
    }
}

Output

输出量

Not Restricted..

翻译自: https://www.includehelp.com/java/securitymanager-checkexit-method-with-example.aspx