Deleteing entries from arrays

[Dalranth]

Hi folks.

I am just learning Java, and am curious as to whether or not you can help me figure something out.

For reference, here is my code:

import java.text.*;

public class JavaMart3
{
	public static void main (String[] args)
	{


		//Declare and Initialize Variables
		boolean ismore = true;
		String[][] deptCode = new String[13][2];
		String[] itemNum = new String[5];
		String[] itemDesc = new String[5];
		String[] name = new String[25];//To display department name
		String letters;
		String stringConverter; //Used to sort array
		double[] unitPrice = new double[5];
		double doubleConverter; //Used to sort array
		double totalCost = 0;
		int[] itemQuant = new int[5];
		int choice = 0;
		int count = 0; //Count the number of transactions
		int flag = 0;
		int verify = 0;  //Test Variable
		int test = 0; //Test Variable			Both used for searching
		int i = 0;
		int length;
		int intConverter; //used to sort array

		//For Formatting numbers
		NumberFormat cf = NumberFormat.getCurrencyInstance();
		NumberFormat nf = NumberFormat.getNumberInstance();

		//Heading for Program
		System.out.println("\t\t\t\tJavaMart Inventory System");
		System.out.println("\t\t\tProgrammed by Cameron Platt");
		System.out.println("\t\t\tFor Karyn Mart");


		//Load Department Info into array...Can probably be done easier
		deptCode[0][0] = "AU";	deptCode[0][1] = "Automotive";
		deptCode[1][0] = "CO";	deptCode[1][1] = "Cosmetics";
		deptCode[2][0] = "CW";	deptCode[2][1] = "Children's Wear";
		deptCode[3][0] = "EL";		deptCode[3][1] = "Electronics";
		deptCode[4][0] = "FD";		deptCode[4][1] = "Food";
		deptCode[5][0] = "FR";		deptCode[5][1] = "Furniture";
		deptCode[6][0] = "HW";	deptCode[6][1] = "Hardware";
		deptCode[7][0] = "JE";		deptCode[7][1] = "Jewlery";
		deptCode[8][0] = "KB";	deptCode[8][1] = "Kitchen & Bath";
		deptCode[9][0] = "MW";	deptCode[9][1] = "Men's Wear";
		deptCode[10][0] = "PH";	deptCode[10][0] = "Pharmacy";
		deptCode[11][0] = "TO";	deptCode[11][1] = "Toys";
		deptCode[12][0] = "WW";	deptCode[12][1] = "Women's Wear";


		do
		{//Begin do loop

			choice = 0;
			flag = 0;

			System.out.println("\n\t\t1. Add an Inventory Item");
			System.out.println("\t\t2. Modify an Inventory Item");
			System.out.println("\t\t3. Delete an Inventory Item");
			System.out.println("\t\t4. Inventory Detail by Department");
			System.out.println("\t\t5. Inventory Summary by Department");
			System.out.println("\t\t6. Exit the Program");

			System.out.print("\n\t\tEnter your choice (1-6):");
			choice = TextIO.getlnInt();

			if ((choice < 1) || (choice > 6))
			{
				System.out.println("**ERROR** You must enter a number 1 through 6");
				ismore = true;
			}//end if

			if (choice == 1)
			{
				//Read in and verify Item Number
				do
				{
					verify = 0;
					i=0;
					test = 0;

					System.out.print("\nPlease enter the Item number:");
					itemNum[count] = TextIO.getlnString();
					itemNum[count] = itemNum[count].toUpperCase();

					//Validation of Length
					if (itemNum[count].length() == 5)
					{
						//Validation of 2 Letters

						letters = itemNum[count].substring(0,2);
						letters = letters.toUpperCase();

						while ((test == 0) && (verify < 13))
						{
							if (letters.equals(deptCode[verify][0]))
							{
								test = 1;
							}// end if
							else
							{
								i++;
								verify++;
								test = 0;
							}//end else
						}//end while
					if (test == 1)
					{
						//Validation of 3#'s
						if ((!Character.isLetter(itemNum[count].charAt(2))) && (!Character.isLetter(itemNum[count].charAt(3))) && (!Character.isLetter(itemNum[count].charAt(4))))
						{
							flag = 0;
						}//end if
						else
						{
							System.out.println("**ERROR03** Item Number must end with 3 numbers");
						}//End else
					}//end if
						else
						{
							System.out.println("**ERROR02** Item Number does not exist");
							flag = 1;
						}//end else
					}// end if
					else
					{
						System.out.println("**ERROR01** Item Number must be 5 characters");
						flag = 1;
					}//end else
				} while (flag == 1); //end inner do while loop

			name[count] = deptCode[verify][1];

			//Read in and Verify item description
			do
			{
				System.out.print("\nPlease enter Item Description:");
				itemDesc[count] = TextIO.getlnString();
				length = itemDesc[count].length();

				if ((length > 0) && (length <= 20))
				{
					flag = 0;
				}//End if
				else
				{
					System.out.println("**ERROR04** Item Description is required, and must be max 20 characters");
					flag = 1;
				}//end else
			} while (flag ==1); //End inner do while loop

			//Read in and Verify Unit Price
			do
			{
				System.out.print("\nPlease enter unit price:");
				unitPrice[count] = TextIO.getlnDouble();

				if ((unitPrice[count] >= 0.0) && (unitPrice[count] <=5000))
				{
					flag = 0;
				}//end if
				else
				{
					System.out.println("**ERROR05** -  Unit Price must be between 0 and 5000");
					flag = 1;
				}//end else
			}while (flag == 1);//end inner do while loop

			//Read in and Verify QOH
			do
			{
				System.out.print("\nPlease enter Quantity on Hand:");
				itemQuant[count] = TextIO.getlnInt();

				if ((itemQuant[count] >= 0) && (itemQuant[count] <=500))
				{
					System.out.print(" Item " +itemNum[count]);
					System.out.println(" has been added");
					flag = 0;
					ismore = true;
				}//end if
				else
				{
					System.out.println("**ERROR06** Quantity on Hand must be between 0 and 500");
					flag = 1;
				}//end else
			}while (flag == 1); //end inner do while loop
			//add to counter
			count++;
		}//end if (choice ==1)



			if (choice == 2)
			{
				System.out.println("\nOption not yet implemented");
				ismore = true;
			}//end if

			if (choice == 3)
			{
				if (count == 0)
				{ 
					System.out.println("Array is empty...Nothing to delete...");
					ismore = true;
				}// end if
				
				System.out.println("Enter item number: ");
				String delNum = textIO.getlnString();
				delNum = delNum.toUpperCase();
				
				
			}//end if

			if (choice == 4)
			{
				if (count == 0)
				{
					System.out.println("\nNo detail items to report");
					ismore = true;
				}// end if

				String currentMax = "";
				int currentMaxIndex;

				for (i = count - 1; i >= 1; i--)
				{
					//Find max in list
					currentMax = itemNum[i];
					currentMaxIndex = i;

					for (int j = i - 1; j >= 0; j--)
					{
						if (currentMax.compareTo(itemNum[j]) < 0)
						{
							currentMax = itemNum[j];
							currentMaxIndex = j;
						}//end if
					}//end inner for loop

					//swap [i] w/ [currentMaxIndex] (if neccessary)

					if (currentMaxIndex != i)
					{
						itemNum[currentMaxIndex] = itemNum[i];
						itemNum[i] = currentMax;

						stringConverter = name[currentMaxIndex];
						name[currentMaxIndex] = name[i];
						name[i] = stringConverter;

						stringConverter = itemDesc[currentMaxIndex];
						itemDesc[currentMaxIndex] = itemDesc[i];
						itemDesc[i] = stringConverter;

						intConverter = itemQuant[currentMaxIndex];
						itemQuant[currentMaxIndex] = itemQuant[i];
						itemQuant[i] = intConverter;

						doubleConverter = unitPrice[currentMaxIndex];
						unitPrice[currentMaxIndex] = unitPrice[i];
						unitPrice[i] = doubleConverter;

					}//end if
				}//end outer for

				//Display sorter Array
				System.out.println("\nNumber of item's in system: " + count);
				System.out.println("\n\tInventory Items by Department\n");

				for (i=0; i < count; i++)
				{
					double cost = itemQuant[i] * unitPrice[i];

					String priceCurrency = cf.format(unitPrice[i]);
					String quantNumber = nf.format(itemQuant[i]);
					String costCurrency = cf.format(cost);

					System.out.println(name[i] + "\t" + itemNum[i] + "\t" + itemDesc[i] + "\t" + quantNumber + "units @ " + priceCurrency + " /unit = " + costCurrency);

					totalCost += cost;
				}//end for loop

				String totalCostCurrency = cf.format(totalCost);

				System.out.println("TOTAL INVENTORY COST: " + totalCostCurrency);
				ismore = true;
			}//end if (choice == 4)

			if (choice == 5)
			{
				System.out.println("\nOption not yet Implemented");
				ismore = true;
			}//end if

			if (choice == 6)
			{
				ismore = false;
			}//end if

		} while (ismore);//end big do while loop
	}//end main
}//end class

The problem lies with deleteing an entry from the array (Selection 3 from the menu.) I have started coding it, but am not quite sure how to complete the code.

I have a slight thought as to what would be needed, but any input from you guys would be appriciated, as I need to have this code done ASAP.

Thanks!

[ComputerJy]

What's in the "TextIO" class?

[Dalranth]

TextIO is basically a way of reading in data from the user. We have the class provided to us.

So for example,

testNum = TextIO.getlnInt();

Would read in an integer from the user.

[ComputerJy]

In that case before I look at your code you should know you have a syntax error in line:

String delNum = TextIO.getlnString() ;

TextIO instead of textIO

[System_Error]

If you are using an array then my suggestion would be set the value at that position to zero or something. ArrayList would be easier to manage.