Exercises Java with Examples-
Practice Exercises Java 4,5 5 302940

Household accounts - Practice Exercises Java


Lesson 4:

Structures and Strings


Exercise 4.25:

Household accounts


Objetive:

Create a program in C # that can store up to 10000 costs and revenues, to create a small domestic accounting system. For each expense (or income), should be allowed to save the following information:

• Date (8 characters: YYYYMMDD format)
• Description of expenditure or revenue
• Category
• Amount (if positive income, negative if an expense)

The program should allow the user to perform the following operations:

1 - Add a new expense (the date should "look right": day 01 to 31 months from 01 to 12 years between 1000 and 3000). The description must not be empty. Needless to validate the other data.

2 - Show all expenses of a certain category (eg, "studies") between two certain dates (eg between "20110101" and "20111231"). Number is displayed, date (format DD / MM / YYYY), description, category in parentheses, and amount to two decimal places, all in the same line, separated by hyphens. At the end of all data show the total amount of data displayed.

3 - Search costs containing a certain text (in the description or category without distinguishing case sensitive). Number is displayed, the date and description (the description is displayed in the sixth truncated blank, if any spaces six or more).

4 - Modify a tab (tab number prompt the user, it will show the previous value of each field and press Enter to not be able to modify any of the data). Should be advised (but not re-order) if the user enters a wrong card number. Needless to validate any data.

5 - Delete some data, from the number that you enter. Should be advised (but not re-order) if you enter an incorrect number. It should show the card to be clear and prompt prior to deletion.

6 - Sort data alphabetically, by date and (if matched) description.

7 - Normalize descriptions: remove trailing spaces, spaces and mirror sites. If a description is all uppercase, will be converted to lowercase (except for the first letter, kept in uppercase).

T-End the use of the application (as we store the information, the data will be lost).


Source Code:


import java.util.*;
public class Main
{
	private final static class accountData
	{
		public String date;
		public String description;
		public String category;
		public double amount;

		public accountData clone()
		{
			accountData varCopy = new accountData();

			varCopy.date = this.date;
			varCopy.description = this.description;
			varCopy.category = this.category;
			varCopy.amount = this.amount;

			return varCopy;
		}
	}

	public static void main()
	{
		int capacity = 10000;
		accountData[] data = new accountData[capacity];
		boolean repeat = true;
		String option;
		int amountOfData = 0;

		do
		{
			System.out.println();
			System.out.println("Household accounts");
			System.out.println();
			System.out.println("1.- Add data.");
			System.out.println("2.- View all data.");
			System.out.println("3.- Search data.");
			System.out.println("4.- Modify data.");
			System.out.println("5.- Delete data.");
			System.out.println("6.- Sort alphabetically");
			System.out.println("7.- Fix spaces");
			System.out.println("Q,T.-Quit.");
			System.out.print("Option: ");
			option = new Scanner(System.in).nextLine();

			switch (option)
			{
				case "1": //add
					if (amountOfData > capacity - 1)
					{
						System.out.println("Database full!");
					}
					else
					{
						do
						{
							System.out.print("Enter date (YYYYMMDD): ");
							data[amountOfData].date = new Scanner(System.in).nextLine();
							// TODO: Individual validation for the date
						} while (data[amountOfData].date.length() == 0);

						do
						{
							System.out.print("Enter Description: ");
							data[amountOfData].description = new Scanner(System.in).nextLine();
							if (data[amountOfData].description.length() == 0)
							{
								System.out.print("Cannot be empty");
							}
						} while (data[amountOfData].description.length() == 0);

						System.out.print("Enter category: ");
						data[amountOfData].category = new Scanner(System.in).nextLine();

						System.out.print("Enter the amount: ");
						data[amountOfData].amount = Double.parseDouble(new Scanner(System.in).nextLine());

						amountOfData++;
					}
					break;

				case "2": //view
					if (amountOfData == 0)
					{
						System.out.println("No data!");
					}
					else
					{
						System.out.print("Enter the category: ");
						String categ = new Scanner(System.in).nextLine();
						System.out.print("Enter the start date (YYYYMMDD): ");
						String startDate = new Scanner(System.in).nextLine();
						System.out.print("Enter the end date (YYYYMMDD): ");
						String endDate = new Scanner(System.in).nextLine();

						for (int i = 0; i < amountOfData; i++)
						{
							if ((data[i].category.equals(categ)) && (data[i].date.compareTo(startDate) >= 0) && (data[i].date.compareTo(endDate) <= 0))
							{
								System.out.printf("%1$s - %2$s/%3$s/%4$s - %5$s -(%6$s) - %7$s" + "\r\n", i + 1, data[i].date.substring(6, 8), data[i].date.substring(4, 6), data[i].date.substring(0, 4), data[i].description, data[i].category, (new Double(data[i].amount)).toString("N2")); // Year -  Month -  Day
							}
						}
					}
					break;

				case "3": //search
					System.out.print("Enter part of the description or category: ");
					String search = new Scanner(System.in).nextLine().toUpperCase();
					boolean found = false;
					for (int i = 0; i < amountOfData; i++)
					{
						if (data[i].description.toUpperCase().contains(search) || data[i].category.toUpperCase().contains(search))
						{
							System.out.printf("%1$s: %2$s - %3$s" + "\r\n", i + 1, data[i].date, data[i].description);
							// TODO: Split in sixth space
							found = true;
						}
					}
					if (!found)
					{
						System.out.println("Not found!");
					}
					break;

				case "4": // modify
					System.out.print("Enter the record number: ");
					int recNumber = Integer.parseInt(new Scanner(System.in).nextLine()) - 1;

					if ((recNumber > amountOfData) || (recNumber < 0))
					{
						System.out.print("Out of range!");
					}
					else
					{
						System.out.printf("Date (was %1$s; hit ENTER to leave as is): ", data[recNumber].date);
						String newText = new Scanner(System.in).nextLine();
						if (!newText.equals(""))
						{
							data[recNumber].date = newText;
						}

						System.out.printf("Description (was %1$s; hit ENTER to leave as is): ", data[recNumber].description);
						newText = new Scanner(System.in).nextLine();
						if (!newText.equals(""))
						{
							data[recNumber].description = newText;
						}

						System.out.printf("Category (was %1$s; hit ENTER to leave as is): ", data[recNumber].category);
						newText = new Scanner(System.in).nextLine();
						if (!newText.equals(""))
						{
							data[recNumber].category = newText;
						}

						System.out.printf("Amount (was %1$s; hit ENTER to leave as is): ", data[recNumber].amount);
						newText = new Scanner(System.in).nextLine();
						if (!newText.equals(""))
						{
							data[recNumber].amount = Double.parseDouble(newText);
						}
					}
					break;

				case "5": //delete
					int position = 0;
					System.out.print("Enter the position number to delete: ");
					position = Integer.parseInt(new Scanner(System.in).nextLine()) - 1;
					if (position > amountOfData)
					{
						System.out.println("Error: out of range");
					}
					else
					{
						// TODO: Ask for confirmation
						for (int i = position; i < amountOfData; i++)
						{
							data[i] = data[i + 1].clone();
						}
						amountOfData--;
					}
					break;

				case "6": // Sort
					accountData aux = new accountData();
					for (int i = 0; i < amountOfData - 1; i++)
					{
						for (int j = i + 1; j < amountOfData; j++)
						{
							String data1 = data[i].date + data[i].description;
							String data2 = data[j].date + data[j].description;
							if (data1.compareTo(data2) > 0)
							{
								aux = data[i].clone();
								data[i] = data[j].clone();
								data[j] = aux.clone();
							}
						}
					}
					System.out.println("Sorted.");
					break;

				case "7": //replace "  " x " "
					for (int i = 0; i < amountOfData; i++)
					{
						data[i].description = data[i].description.trim();
						while (data[i].description.contains("  "))
						{
							data[i].description = data[i].description.replace("  ", " ");
						}
						if (data[i].description.toUpperCase().equals(data[i].description))
						{
							data[i].description = data[i].description.substring(0, 1).toUpperCase() + data[i].description.substring(1).toLowerCase();
						}
					}
					break;

				case "T":
				case "t":
				case "Q":
				case "q":
					repeat = false;
					break;

				default:
					System.out.println("Wrong option!");
					break;
			}
		} while (repeat != false);
		System.out.println("Bye!");
	}
}
Exercisey 4.25

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