Java Class getProtectionDomain()用法及代码示例

java.lang.Class类的getProtectionDomain()方法用于获取此类的ProtectionDomain。该方法以ProtectionDomain对象的形式返回此类的指定ProtectionDomain。

用法:

public ProtectionDomain getProtectionDomain()

参数：此方法不接受任何参数

返回值：此方法以ProtectionDomain对象的形式返回此类的指定ProtectionDomain。

异常该方法抛出：

SecurityException如果安全管理器存在并且其checkPermission方法不允许获取ProtectionDomain。

下面的程序演示了getProtectionDomain()方法。

范例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); 
        } 
    } 
}

输出：

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

范例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); 
        } 
    } 
}

输出：

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

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

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注：本文由纯净天空筛选整理自srinam大神的英文原创作品 Class getProtectionDomain() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。