java 根據類名示例化類

類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()方法用于返回此類的ProtectionDomain(即ProtectionDomain通過實現一組權限來保護源代碼)。

• 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()方法是一個非靜態方法，只能使用類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

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

  返回該類的ProtectionDomain時， getProtectionDomain()方法可能會引發異常。

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

  SecurityException：在此異常中，當安全管理器存在時，其checkPermission()方法將對ProtectionDomain進行限制。

Syntax:

句法：

    public ProtectionDomain getProtectionDomain();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

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

該方法的返回類型為ProtectionDomain ，它返回該類的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

輸出量

ArrayList ProtectionDomain : ProtectionDomain  nullnull<no principals>[email?protected] (("java.security.AllPermission" "<all permissions<" "<all actions>")
)

翻譯自: https://www.includehelp.com/java/class-class-getprotectiondomain-method-with-example.aspx

java 根據類名示例化類