Java Class getClasses()用法及代碼示例

java.lang.Class類的getClasses()方法用於獲取此類的類，這些類是公共的類和接口及其成員。該方法以Class對象數組的形式返回此類的類。

用法:

public Class[] getClasses()

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getClasses()方法。

示例1:

// Java program to demonstrate getClasses() method 
  
import java.util.*; 
  
public class Test { 
    public class Arr { 
    }; 
  
    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 getClasses() method 
        System.out.println("Classes of myClass: "
                           + Arrays.toString( 
                                 myClass.getClasses())); 
    } 
}

輸出：

Class represented by myClass: class Test
Classes of myClass: [class Test$Arr]

示例2:

// Java program to demonstrate getClasses() method 
  
import java.util.*; 
  
class Main { 
  
    public Object obj; 
    private class Arr { 
    }; 
  
    Main() 
    { 
        obj = new 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 getClasses() method 
        System.out.println("Classes of myClass: "
                           + Arrays.toString( 
                                 myClass.getClasses())); 
    } 
}

輸出：

Class represented by myClass: class Main
Classes of myClass: []

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

相關用法

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