📟 ScannerUzdevums

A simple Java console calculator application with robust input handling, error management, and modular design. This project demonstrates best practices in Java structure, testing, and documentation.

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📁 Project Structure

src/
  main/Main.java                # Entry point for the calculator application
  classes/Kalkulators.java      # Calculator logic and arithmetic operations
  interfaces/KalkInterface.java # Functional interface for result formatting
  interfaces/MathInterface.java # Interface for arithmetic operations

test/
  AppTest.java                  # Tests for main application logic
  KalkulatorsTest.java          # Tests for Kalkulators arithmetic and getters/setters
  KalkulatorsInterfaceTest.java # Tests for Kalkulators interface and constants
run-tests.sh                    # Script to compile and run all tests
lib/                            # JUnit and Lombok libraries

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✨ Main Features

Main.java

• Entry point for the calculator app
• Interacts with the user via the console
• Prompts for operation (+, -, *) and two integer operands
• Validates input and limits allowed mistakes before terminating
• Delegates calculation logic to the Kalkulators class

Kalkulators.java

• Implements a simple calculator with addition, subtraction, and multiplication
• Uses MathInterface for multiplication and default subtraction
• Uses KalkInterface for result formatting via a lambda expression
• Annotated with Lombok for getters, setters, and no-args constructor
• Constant ATLAUTO_KLUDU_SKAITS limits allowed input errors

KalkInterface.java

• Functional interface for formatting calculation results as strings

MathInterface.java

• Interface for arithmetic operations
• Provides default implementation for subtraction

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🧪 Testing

AppTest.java

• Simulates user input and captures output
• Verifies addition, multiplication, and invalid operation scenarios

KalkulatorsTest.java

• Verifies correctness of arithmetic operations and getter/setter methods

KalkulatorsInterfaceTest.java

• Verifies result formatting and constant value

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🚀 How to Run

Compile and test

./run-tests.sh

• Cleans, compiles, and runs all tests with preview features enabled

Run the application

java --enable-preview -cp bin main.Main

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📦 Requirements

• Java 24 (for preview features)
• JUnit 5 (standalone jar in lib/)
• Lombok (jar in lib/)

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👤 Author

Arturs

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This README was generated from Javadoc comments in the source files for clarity and completeness.