Java中的类 getClasses() 方法和示例

Java.lang.Class 类的getClasses()方法用于获取该类的类，即公开的类和接口及其成员。该方法以 Class 对象数组的形式返回该类的类。
句法：

public Class[] getClasses()

参数：此方法不接受任何参数。
返回值：该方法以Class对象数组的形式返回该类的类。
异常如果存在安全管理器并且不满足安全条件，则此方法将引发SecurityException 。
下面的程序演示了 getClasses() 方法。
示例 1：

Java

// 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

// 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–