Introduction:
Java is one of the most popular programming languages and is also used in real-world projects. If you want to enhance your skills, you should be creating projects such as a Game, a Calculator, and a tic-tac-toe, etc. In this article, we’ll understand the whole process of how to build a simple Java project, include proper planning, improving your skills, and coding as well.
Why Build a Simple Java Project?
If you are learning Java at a beginner level, you must be compulsory to create a simple Java project you understand the basic syntax of Java, classes and OOP, and also code reusability, modularity. Many programmers learn the concepts from books, YouTube channels, or tutorials, but the main learning comes when you apply them in a project. To build up a small project, upgrade your problem-solving skills.
To set up your development Environment:
Before creating any Java projects, like a Calculator, game, Tic Tac Toe, etc., you must set setup your development environment. If you are not set up properly, you cannot make any Java projects. How to set up your development Environment; it is shown below:
Download Java JDK:
JDK stands for Java Development Kit. The main part of the Java projects is the JDK. Without installing this, you cannot compile and run Java programs. Install the latest version from the Tpoint Tech website.
After installing the set up your JDK properly to run the Java programs. This includes the Java compiler(javac), tools, and libraries to run Java projects, and also the JRE (Java Runtime Environment).
Select an IDE or Text Editor:
After setting up your JDK properly, choose an IDE (Integrated Development Environment) or Text Editor. IDE includes many features such as a source code editor, compiler, and interpreter, and also tools for managing the testing of your projects. A text editor is a lightweight tool that manages the editing and writing of your code.
Many IDEs are given below:
- VS (Visual Studio) Code
- Eclipse
- Notepad
- IntelliJ IDEA
Creating a simple Java project
Build a Simple Calculator: Firstly, you need to choose an IDE to create your project, then you make a new folder.
File name: Calculator.java
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
char continueChoice='y';
do {
System.out.println(" Advanced Calculator ");
System.out.print("Enter first number: ");
double num1 = scanner.nextDouble();
System.out.print("Enter second number: ");
double num2 = scanner.nextDouble();
System.out.println("Choose an operator:");
System.out.println("+ for Addition");
System.out.println("- for Subtraction");
System.out.println("* for Multiplication");
System.out.println("/ for Division");
System.out.println("^ for Power");
System.out.println("% for Modulus");
System.out.println("p for Percentage");
System.out.print("Your choice: ");
char operator = scanner.next().charAt(0);
double result;
switch (operator) {
case '+':
result = add(num1, num2);
break;
case '-':
result = subtract(num1, num2);
break;
case '*':
result = multiply(num1, num2);
break;
case '/':
if (num2 == 0) {
System.out.println("Error: Division by zero is not allowed.");
continue;
}
result = divide(num1, num2);
break;
case '^':
result = power(num1, num2);
break;
case '%':
result = modulus(num1, num2);
break;
case 'p':
case 'P':
result = percentage(num1, num2);
break;
default:
System.out.println("Invalid operator.");
continue;
}
System.out.println("Result: " + result);
System.out.print("Do you want to perform another operation? (y/n): ");
continueChoice = scanner.next().charAt(0);
} while (continueChoice == 'y' || continueChoice == 'Y');
scanner.close();
System.out.println("Calculator Closed. Thank you!");
}
// Basic Operations
public static double add(double a, double b) {
return a + b;
}
public static double subtract(double a, double b) {
return a - b;
}
public static double multiply(double a, double b) {
return a * b;
}
public static double divide(double a, double b) {
return a / b;
}
// Additional Operations
public static double power(double base, double exponent) {
return Math.pow(base, exponent);
}
public static double modulus(double a, double b) {
return a % b;
}
public static double percentage(double percent, double total) {
return (percent / 100) * total;
}
}
Output:
Advanced Calculator
Enter first number: 5
Enter second number: 20
Choose an operator:
+ for Addition
- for Subtraction
* for Multiplication
/ for Division
^ for Power
% for Modulus
p for Percentage
Your choice: +
Result: 25.0
Do you want to perform another operation? (y/n): y
// if yes, then perform the next operations
Advanced Calculator
Enter first number: 20
Enter second number: 10
Choose an operator:
+ for Addition
- for Subtraction
* for Multiplication
/ for Division
^ for Power
% for Modulus
p for Percentage
Your choice: -
Result: 10.0
Do you want to perform another operation? (y/n): n
Calculator Closed. Thank you!
What you have learned from the Calculator Project:
In the learning phase, if you are making this project, you learn the basic to advanced concepts of Java.
Some of the major points are shown below:
- How to take user input using the Scanner class.
- Using conditional and loop statements
- Manage the invalid inputs
- Structuring your code responsible by utilize many methods
Build a Simple Game
This game provides a random number for users. If the guess number is too low or too high. Also, track how many times users play a game in real life.
A Simple Game Project: Firstly, you choose an IDE to create your project, then you make a new folder.
File name: GuessingNumber.java
import java.util.Scanner;
import java.util.Random;
public class GuessingNumber {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
Random random = new Random();
boolean playAgain = true;
while (playAgain) {
int numberToGuess = random.nextInt(100) + 1; // Generates number between 1-100
int guess;
int attempts = 0;
boolean guessed = false;
System.out.println("--- Number Guessing Game ---");
System.out.println("Guess a number between 1 and 100.");
while (!guessed) {
System.out.print("Enter your guess: ");
if (!scanner.hasNextInt()) {
System.out.println("Invalid input. Please enter a valid number.");
scanner.next(); // skip invalid input
continue;
}
guess = scanner.nextInt();
attempts++;
if (guess < 1 || guess > 100) {
System.out.println("Out of range. Please guess between 1 and 100.");
} else if (guess < numberToGuess) {
System.out.println("Too low.");
} else if (guess > numberToGuess) {
System.out.println("Too high.");
} else {
System.out.println("Correct! You guessed it in " + attempts + " attempts.");
guessed = true;
}
}
System.out.print("Do you want to play again? (yes/no): ");
scanner.nextLine(); // clear buffer
String response = scanner.nextLine().trim().toLowerCase();
if (!response.equals("yes")) {
playAgain = false;
System.out.println("Exiting the game. Thank you!");
}
}
scanner.close();
}
}
Output:
--- Number Guessing Game ---
Guess a number between 1 and 100.
Enter your guess: 52
Too low.
Enter your guess: 36
Too low.
Enter your guess: 98
Correct! You guessed it in 3 attempts.
Do you want to play again? (yes/no): y
Exiting the game. Thank you!
Conclusion
To build a simple Java project, such as a guessing number or a Calculator, is an important way to strength your advanced skills for large projects. To help with better understanding the Java concepts like variables, data types, loops, and conditional statements, manage the user input handling. If you are creating a small project, you can build your confidence level and prepare yourself to solve large problems.
I suggest you learn Java programming from the Tpoint tech website, as it provides Java Tutorials, interview questions, and Java Compiler as well.
