Lesson: 76 | Expense Tracking Application

User Story

User Story: As a frequent traveler, I want to be able to track my expenses easily so that I can effectively manage my budget and analyze my spending habits.

Acceptance Criteria:

The application should allow me to create expense categories such as accommodation, transportation, meals, and entertainment.
I should be able to add new expenses, specifying the category, date, amount, and description.
The application should provide a summary of my total expenses and display them in a visually appealing manner, such as graphs or charts.
I should be able to filter and search for expenses based on categories, dates, or descriptions.
The application should allow me to export my expense data in a format compatible with spreadsheet software for further analysis.
I should be able to set a budget for each expense category and receive notifications when I exceed a certain threshold.
The application should provide a secure login system to protect my expense data.
It should be accessible and responsive, allowing me to use it on both desktop and mobile devices.

Solution

Abstract Class:

public abstract class Shape {
    public abstract Decimal calculateArea();
  
    public void display() {
        System.debug('This is a shape.');
    }
}

Rectangle Class:

public class Rectangle extends Shape {
    private Decimal width;
    private Decimal height;
  
    // Constructor
    public Rectangle(Decimal w, Decimal h) {
        width = w;
        height = h;
    }
  
    // Implementing the abstract method to calculate the area of the rectangle
    public Decimal calculateArea() {
        return width * height;
    }
}

Circle Class:

public class Circle extends Shape {
    private Decimal radius;
  
    // Constructor
    public Circle(Decimal r) {
        radius = r;
    }
  
    // Implementing the abstract method to calculate the area of the circle
    public Decimal calculateArea() {
        return 3.14 * radius * radius;
    }
}

Apex Codes for Usage:

Shape rectangle = new Rectangle(5, 10);
System.debug('Rectangle area: ' + rectangle.calculateArea()); // Output: 50

Shape circle = new Circle(7);
System.debug('Circle area: ' + circle.calculateArea()); // Output: 153.86

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Lesson: 76 | Expense Tracking Application

User Story

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