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🌟 Exception Handling in Java: A Practical Guide 🌟

Hey friends! I’ve come across an exciting challenge that I’m eager to join this week. It’s called Exception handling in Java, hosted by @kouba01. You can find more details and participate through this link: SLC S22 Week4 || Exception handling in Java.

Image Source: canva

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Source Code

All code examples are available at: GitHub Repository

Task 1: Detecting Faulty Sensor Readings

Code Overview

this code demonstrates handling invalid temperature readings from multiple sensors the code uses a custom expetison InvalidTemperatureException to handle negative temperatures, ensuring the system continues processing even when encountering invalid readings.

Key features:

• Custom exception for invalid temperatures from sensors
• ArrayList to store valid temperatures
• Error logging for invalid temperatures
• Continuous processing despite errors

Detailed Code Explanation

// Key components:
1. Custom Exception:
   class InvalidTemperatureException extends Exception
   - Handles negative temperature values
   - Provides detailed error messages

2. Temperature Processing:
   processTemperatures(List<Double> readings)
   - Takes a list of temperature readings
   - Filters out negative values
   - Returns only valid temperatures

3. Test Cases:
   temperatures1 = [23.0, -5.0, 18.0, 30.0]
   temperatures2 = [-23.0, 5.0, -18.0, -30.0]

Testing Results

Task 2: Age Validation System

Code Overview

this program an robust age validation system using custom exceptions it continuously prompts users until valid input is receiv, demonstrat proper exception handling for input validation

Key features:

• Custom InvalidAgeException
• Input validation loop
• Clear error messaging
• Scanner for user input

Detailed Code Explanation

// Core functionality:
1. Age Validation Rules:
   - Minimum age: 18
   - Maximum age: 60
   - Throws InvalidAgeException for invalid values

2. Input Processing:
   - Continuous loop until valid input
   - Scanner for user input
   - Exception handling for non-numeric input

3. Usage Example:
   Input: 15 -> Error: Age must be between 18 and 60
   Input: 25 -> Success: Age validated

Testing Results

Task 3: RPG Exception Hierarchy

Code Overview

this RPG system implements a hierarchical exception handling structure & multiple custom exception it demonstrat proper exception inheritance and contextual error handling

Key features:

• multiple custom exceptions (healthException, moveException, inventoryException)
• exception hierarchy & gameException as parentes
• interactive game loop
• health monitoring system

Detailed Code Explanation

// System Components:
1. Exception Hierarchy:
   GameException (parent)
           - HealthException (child)
           - MoveException (child)
           - InventoryException (child)

2. Game Mechanics:
   - Health: 0-100 points
   - Actions:
     * attack: -50 health
     * heal: +30 health
     * move: requires health > 20
     * use item: inventory check

3. Error Handling:
   - Health depletion checks
   - Movement validation
   - Inventory verification

Testing Results

Task 4: Banking Transaction System

code overview

the banking system implements comprehensive exception handling for various transaction scenarios it ensures safe money transfer & proper validation and error reporting

Key features:

• Multiple banking-specific exceptions
• Balance tracking
• Transaction validation
• Detailed error messages

Detailed Code Explanation

// Banking Features:
1. Exception Types:
   BankingException (parent)
         -InsufficientFundsException
          -NegativeTransferException

2. Transaction Rules:
   - Initial balance: 1000.0
   - No negative transfers
   - Balance must cover transfer amount

3. Error Handling:
   - Amount validation
   - Balance checking
   - Input validation for non-numeric values

Testing Results

Task 5: File Resource Management

Code Overview

this implementaion show proper resource management & multiple files, ensuring proper cleanup using try-&-resources and finally blocks.

Key features:

• multiple file handling
• proper resource cleanup
• error logging
• file processing feedback

Detailed Code Explanation

// Resource Management:
1. File Operations:
   - Multiple file reading
   - Automatic resource cleanup
   - BufferedReader implementation

2. Exception Handling:
   - FileNotFoundException
   - IOException
   - Resource cleanup in finally block

3. Testing Setup:
   - Create test files in src/
   - Test & existing and non-existing files

Testing Results

Task 6: Security Monitoring System

Code Overview

The security monitoring system tracks login attempts and alerts administrators of suspicious activity. It demonstrates practical application of exception handling in security contexts.

Key features:

• Login attempt tracking
• Admin alert system
• Custom security exception
• User authentication

Detailed Code Explanation

// Security Features:
1. User Management:
   - Predefined valid users
   - Password verification
   - Login attempt tracking

2. Security Measures:
   - Maximum 3 login attempts
   - Suspicious activity detection
   - Admin alert system

3. Implementation:
   - HashMap for user storage
   - Login attempt counter
   - Alert logging system

Testing Results

Conclusion

These implementations demonstrate various aspects of exception handling in Java, from basic input validation to complex resource management and security monitoring. Each example shows how proper exception handling can make applications more robust and user-friendly.

Remember to:

• Always use specific exceptions for different error cases
• Implement proper resource cleanup
• Provide clear error messages
• Log errors appropriately
• Handle exceptions at the appropriate level

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I want to invite @livinword, @kingit and @kore-1 join the contest.

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My introduction post on Steemit: link

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About the Author

👋 Hi, I’m Kafio!
Software Engineer | Data Science Enthusiast | Trading Buff | Development Geek | Computer Science Lover 💻📊📈

I’m passionate about exploring the intersection of technology and innovation, & a special interest in data science, trading, and software development. Whether it’s diving into the latest in computer science or developing new projects, I’m always excited to learn and share insights. 🚀

I also love to travel

Got questions or just want to connect? Feel free to reach out to me at: [email protected] 🌟

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