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5 Best Java Programs for Beginners in 2023

1. Hello World Program

The iconic “Hello, World!” program is the first step for any programming beginner. While it might seem trivial, it introduces the essential concepts of writing, compiling, and running a Java program. This program displays the text “Hello, World!” on the console, demonstrating how to create a basic Java application. Here’s the code:

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

This simple program showcases the structure of a Java class, the main method which acts as the program’s entry point, and the System.out.println() the statement used to output text to the console.

2. Calculator Program

Creating a basic calculator program is an excellent way to grasp fundamental arithmetic operations, user input, and conditional statements. This program allows users to input two numbers and choose an operation (addition, subtraction, multiplication, or division), and then displays the result. Here’s a sample code snippet:

import java.util.Scanner;

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

        System.out.print("Enter the first number: ");
        double num1 = scanner.nextDouble();

        System.out.print("Enter the second number: ");
        double num2 = scanner.nextDouble();

        System.out.println("Select operation: ");
        System.out.println("1. Addition");
        System.out.println("2. Subtraction");
        System.out.println("3. Multiplication");
        System.out.println("4. Division");
        System.out.print("Enter your choice: ");
        int choice = scanner.nextInt();

        double result = 0;

        switch (choice) {
            case 1:
                result = num1 + num2;
                break;
            case 2:
                result = num1 - num2;
                break;
            case 3:
                result = num1 * num2;
                break;
            case 4:
                result = num1 / num2;
                break;
            default:
                System.out.println("Invalid choice");
        }

        System.out.println("Result: " + result);
        scanner.close();
    }
}

By working through this program, beginners learn about user input, decision-making using switch statements, and performing arithmetic calculations.

3. Simple Guessing Game

A simple guessing game provides hands-on experience with generating random numbers, user interaction, and conditional statements. In this game, the program generates a random number, and the user has to guess it. The program provides hints about whether the user’s guess is too high or too low. This program enhances logical thinking and control flow understanding. Here’s a basic implementation:

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

public class GuessingGame {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Random random = new Random();

        int randomNumber = random.nextInt(100) + 1;
        int userGuess;
        int attempts = 0;

        System.out.println("Welcome to the Guessing Game!");
        System.out.println("I'm thinking of a number between 1 and 100.");

        do {
            System.out.print("Enter your guess: ");
            userGuess = scanner.nextInt();
            attempts++;

            if (userGuess < randomNumber) {
                System.out.println("Too low! Try again.");
            } else if (userGuess > randomNumber) {
                System.out.println("Too high! Try again.");
            } else {
                System.out.println("Congratulations! You guessed the number in " + attempts + " attempts.");
            }
        } while (userGuess != randomNumber);

        scanner.close();
    }
}

Through this program, beginners gain insights into using loops, generating random numbers, and handling user input to create an interactive game.

4. Simple To-Do List

Creating a basic to-do list application introduces beginners to the concept of arrays, user input validation, and loops. This program allows users to add tasks to a list and display them. Here’s a simple implementation:

import java.util.Scanner;

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

        String[] tasks = new String[10];
        int taskCount = 0;

        while (true) {
            System.out.println("To-Do List");
            System.out.println("1. Add Task");
            System.out.println("2. Display Tasks");
            System.out.println("3. Exit");
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt();

            scanner.nextLine(); // Consume newline

            switch (choice) {
                case 1:
                    if (taskCount < tasks.length) {
                        System.out.print("Enter the task: ");
                        String task = scanner.nextLine();
                        tasks[taskCount] = task;
                        taskCount++;
                    } else {
                        System.out.println("To-Do list is full!");
                    }
                    break;
                case 2:
                    System.out.println("Tasks:");
                    for (int i = 0; i < taskCount; i++) {
                        System.out.println((i + 1) + ". " + tasks[i]);
                    }
                    break;
                case 3:
                    System.out.println("Exiting...");
                    scanner.close();
                    System.exit(0);
                default:
                    System.out.println("Invalid choice");
            }
        }
    }
}

This program teaches beginners about arrays, user-driven program flow, and user input validation.

5. Basic ATM Simulator

Building a basic ATM simulator introduces beginners to more complex user interactions, conditional statements, and loop structures. In this program, users can simulate basic ATM actions like checking balance, withdrawing, and depositing funds. Here’s a simple example:

“`java
import java.util.Scanner;

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

    double balance = 1000.0;

    while (true) {
        System.out.println("ATM Simulator");
        System.out.println("1. Check Balance");
        System.out.println("2. Withdraw Funds");
        System.out.println("3. Deposit Funds");
        System.out.println("4. Exit");
        System.out.print("Enter your choice: ");
        int choice = scanner.nextInt();

        switch (choice) {
            case 1:
                System.out.println("Current Balance: $" + balance);
                break;
            case 2:
                System.out.print("Enter the amount to withdraw: ");
                double withdrawalAmount = scanner.nextDouble();
                if (withdrawalAmount > balance) {
                    System.out.println("Insufficient balance.");
                } else {
                    balance -= withdrawalAmount;
                    System.out.println("Withdrawal successful. Remaining balance: $" + balance);
                }
                break;
            case 3:

In conclusion, these five Java programs provide an excellent starting point for beginners to grasp essential programming concepts. From the basic “Hello, World!” to the more interactive ATM simulator, each program introduces fundamental principles like input handling, decision-making, and data manipulation. By exploring and modifying these programs, beginners can lay a strong foundation for their Java programming journey and gain the confidence to tackle more complex projects in the future.

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