Java Class getDeclaredClasses()用法及代碼示例

java.lang.Class類的getDeclaredClasses()方法用於獲取該類的類，這些類是私有，公共，受保護或默認的類及其成員，而不是繼承的類。該方法以Class對象數組的形式返回此類的類。

用法:

public Class[] getDeclaredClasses()
               throws SecurityException

參數：此方法不接受任何參數。

返回值：此方法以Class對象數組的形式返回此類的類。

異常如果存在安全管理器且不滿足安全條件，則此方法將引發SecurityException。

下麵的程序演示了getDeclaredClasses()方法。

示例1:

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

輸出：

Class represented by myClass: class Test
DeclaredClasses of myClass: []

示例2:

// Java program to demonstrate 
// getDeclaredClasses() method 
  
import java.util.*; 
  
class Main { 
  
    private class Arr { 
    }; 
  
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
        // returns the Class object for this class 
        Class myClass = Class.forName("Main"); 
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString()); 
  
        // Get the classes of myClass 
        // using getDeclaredClasses() method 
        System.out.println( 
            "DeclaredClasses of myClass: "
            + Arrays.toString( 
                  myClass.getDeclaredClasses())); 
    } 
}

輸出：

Class represented by myClass: class Main
DeclaredClasses of myClass: [class Main$Arr]

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

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