জাভা অবজেক্ট ওরিয়েন্টেড প্রোগ্রামিং

public class Main {

  static class User {

    public String name = "আরিফ";
    public String land = "বাংলাদেশ";
  }

  public static void main(String[] args) {

    User user = new User();

    System.out.println(user.name);
    System.out.println(user.land);
  }
}

public class Main {

  static class User {

    public String name = "আরিফ";
    public String land = "বাংলাদেশ";
  }

  public static void main(String[] args) {

    User user = new User();

    System.out.println(user.name);
    System.out.println(user.land);
  }
}

public class Main {

  static class Message {

    public String text = "হ্যালো বিশ্ব";
  }

  public static void main(String[] args) {

    Message message = new Message();

    System.out.print(message.text);
  }
}

public class Main {

  static class Message {

    private String text = "হ্যালো বিশ্ব";

    public String show() {
      return text;
    }
  }

  public static void main(String[] args) {

    Message message = new Message();

    System.out.print(message.show());
  }
}

public class Main {

  static class Message {

    protected String text = "হ্যালো বিশ্ব";

    public String show() {
      return text;
    }
  }

  public static void main(String[] args) {

    Message message = new Message();

    System.out.print(message.show());
  }
}

public class Main {

  static class Land {

    public String land = "বাংলাদেশ";
  }

  static class Arif extends Land {

    public String name = "আরিফ";
  }

  public static void main(String[] args) {

    Arif arif = new Arif();

    System.out.println(arif.name);
    System.out.println(arif.land);
  }
}

public class Main {

  static abstract class User {

    public String name;
    public String land;

    public User(String name, String land) {
      this.name = name;
      this.land = land;
    }
  }

  static class Author extends User {

    public Author(String name, String land) {
      super(name, land);
    }
  }

  public static void main(String[] args) {

    Author user = new Author("আরিফ", "বাংলাদেশ");

    System.out.println(user.name);
    System.out.println(user.land);
  }
}

public class Main {

  interface User {
    void info();
  }

  static class Author implements User {

    @Override
    public void info() {
      System.out.print("আরিফ - বাংলাদেশ");
    }
  }

  public static void main(String[] args) {

    Author user = new Author();

    user.info();
  }
}

public class Main {

  interface Name {
    String name();
  }

  interface Land {
    String land();
  }

  static class Author implements Name, Land {

    @Override
    public String name() {
      return "আরিফ";
    }

    @Override
    public String land() {
      return "বাংলাদেশ";
    }
  }

  public static void main(String[] args) {

    Author user = new Author();

    System.out.println(user.name());
    System.out.println(user.land());
  }
}

public class Main {

  static class User {

    public static String name = "আরিফ";

    public static String message() {
      return "হ্যালো বিশ্ব";
    }
  }

  public static void main(String[] args) {

    System.out.println(User.name);
    System.out.print(User.message());
  }
}

public class Main {

  static class User {

    public final String name = "আরিফ";
  }

  public static void main(String[] args) {

    User user = new User();

    System.out.print(user.name);
  }
}