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Java program to get the list of defined classes and interfaces in a class

Java example to get the list of defined classes and interfaces in a class.
Submitted by Nidhi, on May 06, 2022

Problem statement

In this program, we will get the list of defined classes and interfaces in a class using the getClasses() method and print the result.

Source Code

The source code to get the list of defined classes and interfaces in a class is given below. The given program is compiled and executed successfully.

// Java program to get the list of defined classes 
// and interfaces in a class

import java.lang.reflect.Field;
public class Main {
  public interface Inf {}

  public class Sample implements Inf {}

  public static void main(String[] args) throws ClassNotFoundException {
    Class cls = Main.class;
    Class[] classes = cls.getClasses();

    System.out.println("Classes and Interfaces defined in Main class: ");
    for (Class cl: classes)
      System.out.println(cl);
  }
}

Output

Classes and Interfaces defined in Main class: 
class Main$Sample
interface Main$Inf

Explanation

In the above program, we created a public class Main that contains a main() method. The main() method is the entry point for the program.

In the main() method, we got the list of defined classes and interfaces in the Main class using the getClasses() method and printed the result using the foreach loop.

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