Thread: Update Stock Code

I'm trying to figure out how to update stock from entering in a number in a text field and then either clicking the add stock or delete stock button to update the stock.

//These are imported classes, within the code you will see codes with the same name
//this is because I am refering to classes by name so I dont have to keep typing
//import javax.swing. 
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JTextField;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.text.DecimalFormat;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.*;
 
 
 
public class UpdateStock extends JFrame implements ActionListener {
    //This code is creating text fields for the user to enter data, buttons for the user to click on
    //and a text area where text is displayed. The decimal format code sets the format for the price
    //once it's displayed. 
    JTextField stockNo = new JTextField(7);
    JTextField newItem = new JTextField(7);
    JTextField deleteItem = new JTextField(7);
    JLabel numOneLabel = new JLabel("Add Stock:");
    JLabel numTwoLabel = new JLabel("Enter Stock Number:");
    JLabel numthreeLabel = new JLabel("Delete Stock:");
    TextArea information = new TextArea(6, 70);
    JButton check = new JButton("Add Stock");
    JButton delete = new JButton("Delete Stock");
    JButton update = new JButton("Check Stock");
    DecimalFormat pounds = new DecimalFormat("£#,##0.00");
    JPanel jp = new JPanel();
    JLabel jl = new JLabel();
    ImageIcon icon3 = new ImageIcon("plus.png");
    ImageIcon icon2 = new ImageIcon("minus.png");
 
    public static void main(String[] args) {
 
        UpdateStock us = new UpdateStock();
    }
    String key;
    int extra;
    public int getQuantity() { return quantity; }
    public int quantity;
 
 
    public UpdateStock() {
        //This code allows us to create the size, title and settings for the pop up menu.
        //This is where you can add the buttons and text fields/areas, you can tell the box
        //where it will be popping up. The code listens for if the buttons are clicked 
        //then activates a code. 
        setLayout(new BorderLayout());
        setBounds(100, 100, 650, 400);
        setTitle("Update Stock");
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        JPanel top = new JPanel();
        //top.add(new JLabel("Enter Stock Number:"));
        top.add(numTwoLabel);
        top.add(stockNo);
        top.setBackground(Color.CYAN);
        add(top);
        top.add(update);
        check.addActionListener(this);
        update.addActionListener(this);
        add("North", top);
        JPanel middle = new JPanel();
        middle.add(numOneLabel);
        middle.add(newItem);
        middle.add(check);
        middle.add(numthreeLabel);       
        middle.add(deleteItem);
        middle.add(delete);
        middle.add(information);
        middle.add(jp);
        middle.add(new JLabel("Enter in a number from 1 - 6 to Update the Stock"));
        middle.setBackground(Color.WHITE);
        add("Center", middle);
        check.setIcon(icon3);
        delete.setIcon(icon2);
//This code is saying if I want box to be rezideable and visible to the user.
        setResizable(false);
        setVisible(true);
    }
//This code is performing an action for when text is entered into the text field
//if the text in the field is unrecognisable then the code will display an error message
//and if the text is found relateable then it will display the price in pounds format
//and how many there are in stock.     
    public void actionPerformed(ActionEvent e) {
        if (e.getSource()== update) {
        String key = stockNo.getText();
        String name = StockData.getName(key);
        if (name == null) {
            information.setText("No such item in stock");
        }
        else {
            information.setText(name);
            information.append("\nPrice: " + pounds.format(StockData.getPrice(key)));
            information.append("\nNumber in stock: " + StockData.getQuantity(key));
            information.append("\nDescription: " + StockData.Description(key));
 
 
        }
 
 
        }
    } public void update(String key, int extra, ActionEvent e) {
  //  if (e.getSource()== check) {
    //JOptionPane.showMessageDialog (null, "This is a message box");
   // StockData.Item item = stock.get(key);
   // if (item != null) item.quantity += extra;
    }
    }

Originally Posted by KevinWorkman

And what's the problem? What does that code do? Does it compile? Does it run? Does it give you some kind of error?

The code runs a table which contains text fields and buttons. The problem is I want to update the quantity of an item by entering in a number to the text field and when i click either the add or delete button it will take the number I entered in the text field and take it away (or add) from the quantity. Each item has an item number so I will first enter the item number into one of the fields and then the number I want to update the quantity will be in another field. That's how the code will know where to update the number to.

Originally Posted by KevinWorkman

Okay, and which part of this is giving you trouble?

I don't know where to start to get the "Add Stock" & "Delete Stock" button to work. I need to make sure the add stock button adds the number that was put into the text field and added to the quantity that is already there and same for the Delete Stock button.

Originally Posted by Norm

Is the action listener method called when the button is pressed? Add a println() statement to print out a message to show if the listener method is called.

The action listener is called

Originally Posted by Norm

That's good. What does the listener need to do now? Can you explain what problems you are having here?
Where is the data it needs? How should it get that data and what should it do with the results?

Picture1.jpg
When I enter in a number the item information comes up (when I click "Check Stock") and you can see the quantity but now when i enter the number into those text fields beside Add Stock and Delete Stock. I want to either add stock to whats already there or delete. The image should make things more clearer.

Originally Posted by Norm

Get the number and add it to whats already there

YESS exactly this. I don't know how I can take the number that is in the text field and add it to the current quantity of the item.