Java Class getProtectionDomain()用法及代碼示例

java.lang.Class類的getProtectionDomain()方法用於獲取此類的ProtectionDomain。該方法以ProtectionDomain對象的形式返回此類的指定ProtectionDomain。

用法:

public ProtectionDomain getProtectionDomain()

參數：此方法不接受任何參數

返回值：此方法以ProtectionDomain對象的形式返回此類的指定ProtectionDomain。

異常該方法拋出：

SecurityException如果安全管理器存在並且其checkPermission方法不允許獲取ProtectionDomain。

下麵的程序演示了getProtectionDomain()方法。

範例1：

// Java program to demonstrate 
// getProtectionDomain() method 
  
import java.util.*; 
  
public class Test { 
  
    public Object obj; 
  
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
  
        try { 
  
            // returns the Class object for this class 
            Class myClass = Class.forName("Test"); 
  
            System.out.println("Class represented by myClass:"
                               + myClass.toString()); 
  
            // Get the ProtectionDomain of myClass 
            // using getProtectionDomain() method 
            System.out.println("ProtectionDomain of myClass:"
                               + myClass.getProtectionDomain()); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Class represented by myClass:class Test
java.security.AccessControlException:access denied ("java.lang.RuntimePermission" "getProtectionDomain")

範例2：

// Java program to demonstrate 
// getProtectionDomain() method 
  
import java.util.*; 
  
class Main { 
  
    private Object obj; 
  
    public static void main(String[] args) 
        throws ClassNotFoundException, NoSuchFieldException 
    { 
  
        try { 
            // returns the Class object for this class 
            Class myClass = Class.forName("Main"); 
  
            System.out.println("Class represented by myClass:"
                               + myClass.toString()); 
  
            String ProtectionDomainName = "obj"; 
  
            // Get the ProtectionDomain of myClass 
            // using getProtectionDomain() method 
            System.out.println("ProtectionDomain of myClass:"
                               + myClass.getProtectionDomain()); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Class represented by myClass:class Main
java.security.AccessControlException:access denied ("java.lang.RuntimePermission" "getProtectionDomain")

參考： https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getProtectionDomain-

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