Java Message Receiver: Store, Display, and Manage Messages

package project4;

import java.util.Scanner;

public class class5 { private static final int MAX_MESSAGES = 20; private String[] messages; private int count;

public class5() {
    messages = new String[MAX_MESSAGES];
    count = 0;
}

public void receiveMessage(String message) {
    if (count == MAX_MESSAGES) {
        deleteOldestMessage();
    }
    messages[count] = message;
    count++;
}

public void deleteOldestMessage() {
    for (int i = 0; i < count - 1; i++) {
        messages[i] = messages[i + 1];
    }
    count--;
}

public void displayMessages() {
    if (count == 0) {
        System.out.println('No messages');
    } else {
        for (int i = 0; i < count; i++) {
            System.out.println('Message ' + (i + 1) + ': ' + messages[i]);
        }
    }
}

public void readMessage(int index) {
    if (index >= 1 && index <= count) {
        System.out.println('Message ' + index + ': ' + messages[index - 1]);
    } else {
        System.out.println('Invalid message index');
    }
}

public void deleteMessage(int index) {
    if (index >= 1 && index <= count) {
        for (int i = index - 1; i < count - 1; i++) {
            messages[i] = messages[i + 1];
        }
        count--;
        System.out.println('Message ' + index + ' deleted');
    } else {
        System.out.println('Invalid message index');
    }
}

public void deleteAllMessages() {
    count = 0;
    System.out.println('All messages deleted');
}

public void displayMenu() {
    System.out.println('1. Receive message');
    System.out.println('2. Display messages');
    System.out.println('3. Read message');
    System.out.println('4. Delete message');
    System.out.println('5. Delete all messages');
    System.out.println('6. Exit');
}

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    class5 messageReceiver = new class5();

    int choice = 0;
    while (choice != 6) {
        messageReceiver.displayMenu();
        System.out.print('Enter your choice: ');
        choice = scanner.nextInt();

        switch (choice) {
            case 1:
                System.out.print('Enter the message: ');
                scanner.nextLine(); // consume the newline character
                String message = scanner.nextLine();
                messageReceiver.receiveMessage(message);
                System.out.println('Message received');
                break;
            case 2:
                messageReceiver.displayMessages();
                break;
            case 3:
                System.out.print('Enter the message index: ');
                int index = scanner.nextInt();
                messageReceiver.readMessage(index);
                break;
            case 4:
                System.out.print('Enter the message index: ');
                index = scanner.nextInt();
                messageReceiver.deleteMessage(index);
                break;
            case 5:
                messageReceiver.deleteAllMessages();
                break;
            case 6:
                System.out.println('Exiting...');
                break;
            default:
                System.out.println('Invalid choice');
                break;
        }
    }

    scanner.close();
}

}