Class getClasses() method in Java with Examples

The getClasses() method of java.lang.Class class is used to get the classes of this class, which are the class and interfaces that are public and its members. The method returns the classes of this class in the form of array of Class objects. 
Syntax:

public Class[] getClasses()

Parameter: This method does not accept any parameter.
Return Value: This method returns the classes of this class in the form of array of Class objects. 
Exception This method throws SecurityException if a security manager is present and the security conditions are not met.
Below programs demonstrate the getClasses() method.
Example 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()));
    }
}

Output:

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

Example 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()));
    }
}

Output:

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

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