School Records: Data Integrity Guard (JavaBasics_Task_255_V0.1)

📖 Description

Ensuring that a system contains valid data is a core responsibility of an object. This project demonstrates Defensive Programming through encapsulation. By making the currentAge field private and providing a "Smart Setter", we prevent the student's age from ever becoming negative. The object acts as a gatekeeper, rejecting invalid inputs and providing feedback while maintaining its internal consistency.

📋 Requirements Compliance

• Encapsulated State: The currentAge field is strictly private.
• Validation Logic: Implemented an if-else check within the setter to filter out negative values.
• Feedback System: The program provides a specific error message when a validation rule is violated.
• State Persistence: Verified that invalid updates do not overwrite existing correct data.

🚀 Architectural Stack

• Java 8+ (Encapsulation, Setters with Validation, Logical Branching)

🏗️ Implementation Details

• SchoolStudent: The Model. Contains the business logic for age validation.
• Solution: The Controller. Tests the "attack" (negative age) and the "valid update".

📋 Expected result

Attention! The student's age cannot be negative. The value has not been updated.
10
15

💻 Code Example

Project Structure:

JavaBasics_Task_255/
├── src/
│   └── com/yurii/pavlenko/
│                  ├── SchoolStudent.java
│                  └── Solution.java
└── README.md

Code

package com.yurii.pavlenko;

public class Solution {

    public static void main(String[] args) {

        SchoolStudent student = new SchoolStudent(10);

        student.setCurrentAge(-5);
        System.out.println(student.getCurrentAge());

        student.setCurrentAge(15);
        System.out.println(student.getCurrentAge());
    }
}

package com.yurii.pavlenko;

public class SchoolStudent {
    private int currentAge;

    public SchoolStudent(int age) {
        this.currentAge = age;
    }

    public int getCurrentAge() {
        return currentAge;
    }

    public void setCurrentAge(int potentialAge) {
        if (potentialAge < 0) {
            System.out.println("Attention! The student's age cannot be negative. The value has not been updated.");
        } else {
            this.currentAge = potentialAge;
        }
    }
}

⚖️ License

This project is licensed under the MIT License.

Copyright (c) 2026 Yurii Pavlenko

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files...

License: MIT