Array display on JTextarea using JRadiobutton and Jbutton.

[chris uchime]

Hi
Am trying to implement a jframe with the following components:
Jtextarea, Jtextfield1, Jtextfield2, Jtextfield3 and three grouped JRadio buttons namely (continuee, save, cancel) and a “Submit” button.
I have this code that is meant to store a list of sales items in an array, then displays them in Jtextarea and then continues to update the items if the “continue” button is selected, or displays array items in Jtextarea and save the items in the database if “save” button is selected, or deletes/refreshes the array items if “cancel” button is selected.
So far I have this code, but still have some issues to fix… like, 1) each item is displayed twice per entry. 2) the items are not stored as array. 3) cant get items displayed in jtextarea. 4) how can I really refresh an array?
These are my codes so far. Please any help would be much appreciated…..

//   Item.java
	//   Represents an item in a shopping cart.
	// ***************************************************************
	import java.text.NumberFormat;
	public class Item
	{
	    private String name;
	    private double price;
	    private int quantity;
	    // -------------------------------------------------------
	    //  Create a new item with the given attributes.
	    // -------------------------------------------------------
	    public Item (String itemName, double itemPrice, int numPurchased)
	    {
	    name = itemName;
	    price = itemPrice;
	    quantity = numPurchased;
	    }
	    // -------------------------------------------------------
	    //   Return a string with the information about the item
	    // -------------------------------------------------------
	    public String toString ()
	    {
	    NumberFormat fmt = NumberFormat.getCurrencyInstance();
    return (name + "\t" + fmt.format(price) + "\t" + quantity + "\t"
	        + fmt.format(price*quantity));
	    }
	    // -------------------------------------------------
	    //   Returns the unit price of the item
	    // -------------------------------------------------
	    public double getPrice()
	    {
	    return price;
	    }
	    // -------------------------------------------------
	    //   Returns the name of the item
	    // -------------------------------------------------
	    public String getName()
	    {
	    return name;
	    }
	    // -------------------------------------------------
	    //   Returns the quantity of the item
	    // -------------------------------------------------
	    public int getQuantity()
	    {
	    return quantity;
	    }
	}



	// ***************************************************************
	// Test.java
	// Uses the Item class to create items and add them to a shopping
	// cart stored in an ArrayList.
	// ***************************************************************
	import java.util.ArrayList;
	import java.util.Scanner;
	import java.text.NumberFormat;


public class Test extends javax.swing.JFrame {
  ArrayList<Item> Cart = new ArrayList<Item>();
Item item;
	      String itemName;
	      double itemPrice;
	      int quantity;
	   double totalPrice = 0.0;
	    double sum = 0.0;
   Scanner input = new Scanner(System.in);

private void submitActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
	         // *** create a new item and add it to the cart
	        item = new Item (itemName, itemPrice, quantity);
	            Cart.add(item);
              //*** declare and instantiate a variable cart to be an empty ArrayList
	     try{
                  itemName = Jtextfield1.getText();
                 input.next();
                 itemPrice = Double.parseDouble(Jtextfield2.getText());
                 input.next();
                 quantity = Integer.parseInt(Jtextfield3.getText());
         //     create a new item and add it to the cart
	        item = new Item (itemName, itemPrice, quantity);
	            Cart.add(item);
    //       print the contents of the cart object using println
if (continuee.isSelected()){
                input.next();
               for (int i = 0; i < Cart.size(); i++)
            {
                Item itm = Cart.get(i);
               jtextarea.setText(itm);
	            } 
            }
            else if (save.isSelected()){
                input.next();
                 for (int i = 0; i < Cart.size() ; i++)
	            {
	                Item itm = Cart.get(i);
	                jtextarea.setText(itm);
	                totalPrice = itm.getQuantity() * itm.getPrice();
	                sum += totalPrice;
	            }
NumberFormat fmt = NumberFormat.getCurrencyInstance();
           System.out.println("The total price is: " + fmt.format(sum)); 
     }
            else if (cancel.isSelected()){
                 }
          else {JOptionPane.showMessageDialog(null, "Error! - Please ensure your entries are correct and existing.");}
         }
        catch(Exception e){
            JOptionPane.showMessageDialog(null, "Error! - Please ENSURE your entries are correct and existing.");}      }   

[Campbell Ritchie]

Start with an application which stores the array and does not have any GUI code at all.

[chris uchime]

Hi
I came up with the following codes with JFrame and swing control.. everything seems to work fine but the items are not arrayed and it only displays the current text on the jtextfield... please any good suggestions will be appreciated: below are the codes for the jframe and swing ....

package test;


import java.text.*;
import java.util.*;
import javax.swing.*;
import test.Item;

public class testapp extends javax.swing.JFrame {

            ArrayList<Item> Cart = new ArrayList<Item>();

	 NumberFormat fmt = NumberFormat.getCurrencyInstance();

	   Item item;

	      String itemName;

	      double itemPrice;

	      int quantity;

	   double totalPrice = 0.0;

	    double sum = 0.0;

private void submitbtnActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        
        try{
                 itemName =Jtextfield1.getText();
                
                 itemPrice = Double.parseDouble(Jtextfield2.getText());
                
                 quantity = Integer.parseInt(Jtextfield3.getText());
           if(continuee.isSelected()){
                item = new Item (itemName, itemPrice, quantity);

         Cart.add(item);
                for (int i = 0; i < Cart.size(); i++)

	            {

	                Item itm = Cart.get(i);

	                jtextarea.setText(itm.toString());

	            } 
                 }
           else if (save.isSelected()){
               for (int i = 0; i < Cart.size() ; i++)

	            {
                         
	                 Item itm = Cart.get(i);

	                jtextarea.setText(itm.toString());

	                totalPrice = itm.getQuantity() * itm.getPrice();

	                sum += totalPrice;}
	           
                    jtextarea.setText("The total price is: " + fmt.format(sum)); 
           }
           else{JOptionPane.showMessageDialog(null,
                "Error!- Please ensure your entries are correct and existing.");
             }    
        
        }
        catch (Exception e){
        JOptionPane.showMessageDialog
                (null, "Error! - Please ENSURE your entries are correct and existing.");}
    }

[Campbell Ritchie]

I have already made a suggestion how to start. That was over a week ago.