java 根据类名示例化类

类class getProtectionDomain()方法 (Class class getProtectionDomain() method)

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

  getProtectionDomain()方法在java.lang包中可用。

• getProtectionDomain() method is used to return the ProtectionDomain of this class (i.e. ProtectionDomain protects source code by implementing a set of permissions).

  getProtectionDomain()方法用于返回此类的ProtectionDomain(即ProtectionDomain通过实现一组权限来保护源代码)。

• getProtectionDomain() method is a non-static method, it is accessible with the class objects only and if we try to access the method with the class name then we will get an error.

  getProtectionDomain()方法是一个非静态方法，只能使用类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• getProtectionDomain() method may throw an exception at the time of returning ProtectionDomain of the class.

  返回该类的ProtectionDomain时， getProtectionDomain()方法可能会引发异常。

  SecurityException : In this exception its checkPermission() method restricts ProtectionDomain when security manager exists.

  SecurityException：在此异常中，当安全管理器存在时，其checkPermission()方法将对ProtectionDomain进行限制。

Syntax:

句法：

public ProtectionDomain getProtectionDomain();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is ProtectionDomain, it returns the ProtectionDomain of the class.

该方法的返回类型为ProtectionDomain ，它返回该类的ProtectionDomain。

Example:

例：

// Java program to demonstrate the example // of ProtectionDomain getProtectionDomain() method of Class import java.security.*;public class GetProtectionDomainOfClass {
       public static void main(String[] args) throws Exception {
           // Get Class object        Class cl = Class.forName("java.util.ArrayList");        // It return the ProtectionDomain of the class ArrayList        ProtectionDomain pd = cl.getProtectionDomain();        // Display ProtectionDomain of the class        System.out.print("ArrayList ProtectionDomain : ");        System.out.println(pd);    }}

Output

输出量

ArrayList ProtectionDomain : ProtectionDomain  null null 
    
       ( ("java.security.AllPermission" "
     
      "))
     
    

翻译自:

java 根据类名示例化类