Java Class getClasses()用法及代码示例

java.lang.Class类的getClasses()方法用于获取此类的类，这些类是公共的类和接口及其成员。该方法以Class对象数组的形式返回此类的类。

用法:

public Class[] getClasses()

参数：此方法不接受任何参数。

返回值：此方法以Class对象数组的形式返回此类的类。

异常如果存在安全管理器且不满足安全条件，则此方法将引发SecurityException。

下面的程序演示了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())); 
    } 
}

输出：

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())); 
    } 
}

输出：

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

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

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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 getClasses() 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。