Java Logic Practice Exercises 🧠💻

This repository contains a small collection of beginner-friendly Java exercises designed to improve logic, problem-solving, and familiarity with core Java features like loops, collections, and console input.

📂 Exercises Included

1. 🧺 Inventory Value Sorter

Calculates the total value of products in an inventory based on quantity and unit price.
Sorts the products from most valuable to least.

Example:

Map<String, double[]> inventory = new HashMap<>();
inventory.put("apples", new double[]{50, 0.5});
inventory.put("oranges", new double[]{30, 0.8});
Output:

css
Copiar código
[("apples", 25.0), ("oranges", 24.0)]

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2. ⏰ Campanadas

Reads a start and end time (HH:mm) from the console and calculates how many times a bell rings in that interval. Bells ring at minutes 0, 15, 30, and 45 of each hour.

Example input:

Start = 9:44  
End = 10:01

Output:

2 campanadas

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3. 📚 Vocabulary Comparison with Sets

Given two text strings, this program:

Finds unique words in each text

Finds words in common

Returns all words sorted alphabetically (without duplicates)

Only A: [a, hello, is, test, this]
Only B: [and, more, of, tests, text]
Common: [world]
All sorted: [a, and, hello, is, more, of, test, tests, text, this, world]

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4. ➕ Integer Sum with Swing

A simple graphical interface that allows users to add two integer numbers. If a non-numeric value is entered, an error message is displayed.

Features:

• Built with JFrame, JTextField, JButton, and JLabel

• Uses a lambda expression for the ActionListener event

• Includes exception handling with NumberFormatException for validation

Example (visual):

[ 4 ] + [ 6 ] = 10

If invalid input is entered:

You must enter an integer number.

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🚀 How to Run

1. Clone the repo:

git clone https://github.com/serxa92/JavaExercises.git

2. Open the project in IntelliJ (or any Java IDE)

3. Run the desired exercise .java file from the main method

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Feel free to contribute or add new logic challenges!