📌 Introduction

This document covers Array Concepts and Chatbot Applications in Java.

• Arrays store multiple values of the same data type in a single variable.
• Chatbots are programs that simulate human-like interactions.

1️⃣ Basic Array Concept

What is an Array?

An array is a data structure that stores multiple elements of the same type in a contiguous memory location.

Example Program: Basic Array Operations

package com.codingboot.arrays;

public class ArrayProgram {
public static void main(String[] args) {
// Declare and initialize an array
int marks[] = {100, 56, 67, 70, 90, 8, -4};

int total = 0;
int min = marks[0];

for (int i = 0; i < marks.length; i++) {
total = total + marks[i]; // Calculate total sum
if (marks[i] < min) {
min = marks[i]; // Find minimum element
}
}

System.out.println(“Total = ” + total);
System.out.println(“Average = ” + (total) / marks.length);
System.out.println(“Min = ” + min);
}
}

Explanation:

1. Array Initialization: {100, 56, 67, 70, 90, 8, -4}
2. Calculate Total: Using a loop, sum all elements.
3. Find Minimum: Compare each element to get the smallest value.
4. Calculate Average: Divide sum by array length.

💻 Run Program & Output:

Input: (No input required)

Output:

Total = 387
Average = 55
Min = -4

2️⃣ Shopping ChatBot

Project Description:

This is a simple chatbot that helps users inquire about available products, their prices, and stock.

Example Program: Shopping ChatBot
package com.codingboot.arrays;

import java.util.Scanner;

public class ShoppingChatBot {
public static void main(String[] args) {
String products[] = {“Laptop”, “Mobile”, “Keyboard”, “Book”};
int price[] = {900, 200, 300, 500};
int stock[] = {2, 4, 5, 8};

System.out.println(“ShoppingBot: Welcome to our store! Type ‘list’ to see available products.”);

Scanner scanner = new Scanner(System.in);
while (true) {
boolean found = false;
System.out.print(“You: “);
String input = scanner.nextLine();

if (input.equalsIgnoreCase(“exit”)) {
System.out.println(“ShoppingBot: Thanks for visiting! Have a great day.”);
break;
} else if (input.contains(“list”) || input.contains(“products”)) {
for (String product : products) {
System.out.println(“- ” + product);
}
} else {
for (int i = 0; i < products.length; i++) {
if (input.equalsIgnoreCase(products[i])) {
System.out.println(“Here are the details for ” + input);
System.out.println(“Price = ” + price[i]);
System.out.println(“Stock = ” + stock[i]);
found = true;
break;
}
}
if (!found) {
System.out.println(“Sorry! I couldn’t find that product. Type ‘list’ to see available products.”);
}
}
}
}
}

Explanation:

1. Predefined product list: Products, prices, and stock.
2. User Interaction: Accepts product name as input.
3. Displays product details: If found, shows price and stock.
4. Exit Condition: User types “exit” to stop.

💻 Run Program & Output:

Input:

You: list

Output:

- Laptop
- Mobile
- Keyboard
- Book

Input:

You: Laptop

Output:

Here are the details for Laptop
Price = 900
Stock = 2

Input:

You: exit

Output:

ShoppingBot: Thanks for visiting! Have a great day.

3️⃣ Simple ChatBot Using Arrays

Project Description:

A chatbot that responds to predefined questions using an array.

Example Program: Simple ChatBot

package com.codingboot.arrays;

import java.util.Random;
import java.util.Scanner;

public class SimpleChatBotUsingArray {
    public static void main(String[] args) {
        String questions[] = {
                "hello",
                "hi",
                "how are you",
                "what is your name",
                "what can you do",
                "bye",
                "who created you"
        };
        String answer[] = {
                "Hello! How can I assist you?",
                "Hi there! How can I help?",
                "I'm just a chatbot, but I'm doing great!",
                "I'm a simple Java chatbot.",
                "I can answer simple queries.",
                "Goodbye! Have a great day!",
                "I was created by a Java developer."
        };

        String randomResponse[] = {
                "I'm not sure how to respond to that.",
                "I don't know, but I'm learning every day.",
                "Can you rephrase your question?",
                "That's interesting! Tell me more..."
        };

        Scanner scanner = new Scanner(System.in);
        Random random = new Random();
        boolean exit = false;

        while (!exit) {
            System.out.print("You: ");
            String input = scanner.nextLine();
            boolean isFound = false;

            for (int i = 0; i < questions.length; i++) {
                if (input.equalsIgnoreCase("bye")) {
                    System.out.println("ChatBot: Goodbye! Have a great day!");
                    exit = true;
                    break;
                }
                if (input.equalsIgnoreCase(questions[i])) {
                    System.out.println("ChatBot: " + answer[i]);
                    isFound = true;
                }
            }

            if (!isFound) {
                int randomIndex = random.nextInt(randomResponse.length);
                System.out.println("ChatBot: " + randomResponse[randomIndex]);
            }
        }
    }
}

Explanation:

1. Predefined Questions & Answers: Uses arrays for chatbot responses.
2. User Interaction: Accepts user input.
3. Matching Questions: If input matches, responds accordingly.
4. Random Response: If question is unknown, picks a random reply.
5. Exit Condition: Stops when the user types “bye”.

💻 Run Program & Output:

Input:

You: hello

Output:

ChatBot: Hello! How can I assist you?

Input:

You: what is your name

Output:

ChatBot: I'm a simple Java chatbot.

Input:

You: unknown question

Output:

ChatBot: Can you rephrase your question?

Input:

You: bye

Output:

ChatBot: Goodbye! Have a great day!

---

📌 Summary

✅ Arrays store multiple elements of the same type.
✅ Basic Array Program: Finds total, average, and minimum value.
✅ Shopping ChatBot: Provides product details on user request.
✅ Simple ChatBot: Responds to user queries using predefined arrays.

🔹 These programs demonstrate real-world applications of arrays in Java. 🚀