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listModle.modif y

38 New Member
I have been adding buttons to my GUI to manipulate list data.
I added a Delete button this morning in case I decide I no longer needed a particular element.
I am now working on a modify button, in case I want to keep the element, but only modify a field or two.
This seemed easy after my Delete, but now I am having issues with it.
Is there a listModel command out there that I am unfamiliar with that will help me with this?
Right now I have modify set up exactly like delete, just to put architecture in place without creating an error.
Any tips on what I should change to make it work correctly? Here is entire class.
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  1. import java.util.*;
  2. import java.awt.*;
  3. import java.awt.event.*;
  4. import javax.swing.*;
  5. import javax.swing.event.*;
  6. import java.text.*;
  7. import java.lang.*;
  8. import javax.swing.JFrame;
  9.  
  10. public class Inventory2 extends JFrame
  11. {
  12.     private JLabel cdNameLabel; // name label 
  13.     private JLabel artistLabel; // item number label 
  14.     private JLabel nstockLabel; // units in stock label 
  15.     private JLabel priceLabel; // price each label 
  16.     private JLabel itemLabel; // item number label 
  17.     private JTextField cdNameField; // name display 
  18.     private JTextField artistField; // artist display 
  19.     private JFormattedTextField nstockField; // units in stock display 
  20.     private JFormattedTextField priceField; // price each display 
  21.     private JTextField itemField; // item number display 
  22.     private NumberFormat nstockFormat; // format field and parse numbers 
  23.     private NumberFormat priceFormat; // format field and parse numbers 
  24.     private JButton btnAdd; // first button 
  25.     private JButton btnPrev; // previous button 
  26.     private JButton btnNext; // next button 
  27.     private JButton btnDel; // last button 
  28.     private JButton btnFirst; // first button
  29.     private JButton btnLast; // last button
  30.     private JButton btnModify; // modify button
  31.     private JButton btnSave; // save button
  32.     private JButton btnSearch; // search button
  33.     private JPanel buttonJPanel; // JPanle to hold buttons 
  34.     private JPanel fieldJPanel; // JPanel to hold labels and displays 
  35.     private JPanel fontJPanel; // JPanel to display logo 
  36.     private int currCD; 
  37.     private double total = 0; // variable for total inventory 
  38.     private JList Inventorylist; // JList to take place of old array
  39.     private DefaultListModel listModel;
  40.     private JScrollPane jScrollPanel;  
  41.     private float Invtotal = .00f;
  42.  
  43.      DecimalFormat formatter = new DecimalFormat("$0.00");
  44.  
  45.     public Inventory2() // create class and method to perform GUI build 
  46.     { 
  47.         initComponents(); 
  48.     } 
  49.  
  50.     private void initComponents() 
  51.     { 
  52.  
  53.         // create label names 
  54.         cdNameLabel = new JLabel("CD Name:"); 
  55.         artistLabel = new JLabel("Artist:");
  56.         nstockLabel = new JLabel("In Stock:"); 
  57.         priceLabel = new JLabel("Each Item Cost:$"); 
  58.         itemLabel = new JLabel("Item Number:"); 
  59.  
  60.  
  61.         // initial fields
  62.         cdNameField = new JTextField(25);
  63.         cdNameField.setEditable(true);
  64.         artistField = new JTextField(15);
  65.         artistField.setEditable(true);
  66.         nstockField = new JFormattedTextField(nstockFormat);
  67.         nstockField.setEditable(true);
  68.         nstockField.setColumns(5);
  69.         priceField = new JFormattedTextField(priceFormat);
  70.         priceField.setEditable(true);
  71.         priceField.setColumns(5);
  72.         itemField = new JTextField(4);
  73.         itemField.setEditable(true);
  74.  
  75.         // JList
  76.         jScrollPanel = new JScrollPane();
  77.         Inventorylist = new JList(); 
  78.         currCD = 0;
  79.  
  80.  
  81.         // buttons 
  82.         btnAdd = new JButton(); 
  83.         btnNext = new JButton(); 
  84.         btnPrev = new JButton(); 
  85.         btnDel = new JButton();
  86.         btnLast = new JButton();
  87.         btnFirst = new JButton();
  88.         btnModify = new JButton(); 
  89.         btnSave = new JButton();
  90.         btnSearch = new JButton();
  91.  
  92.         getContentPane().setLayout(new FlowLayout());
  93.         setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
  94.  
  95.         // add shapesJPanel to frame
  96.         ShapesJPanel shapesJPanel = new ShapesJPanel();    
  97.         getContentPane().add( new ShapesJPanel() );            
  98.  
  99.         // place textFields and labels
  100.  
  101.         //artist
  102.         artistLabel.setText("Artist"); 
  103.         getContentPane().add(artistLabel); 
  104.  
  105.         artistField.setMinimumSize(new Dimension(70,20)); 
  106.         artistField.setPreferredSize(new Dimension(70,20));
  107.         getContentPane().add(artistField); 
  108.  
  109.         // cd name
  110.         cdNameLabel.setText("CD Name"); 
  111.         getContentPane().add(cdNameLabel); 
  112.  
  113.         cdNameField.setMinimumSize(new Dimension(70,20)); 
  114.         cdNameField.setPreferredSize(new Dimension(70,20));
  115.         getContentPane().add(cdNameField);
  116.  
  117.         // copies in stock
  118.         nstockLabel.setText("Copies In Stock"); 
  119.         getContentPane().add(nstockLabel); 
  120.  
  121.         nstockField.setMinimumSize(new Dimension(5,20)); 
  122.         nstockField.setPreferredSize(new Dimension(5,20));
  123.         getContentPane().add(nstockField); 
  124.  
  125.         //price of cd
  126.         priceLabel.setText("Price"); 
  127.         getContentPane().add(priceLabel); 
  128.  
  129.         priceField.setMinimumSize(new Dimension(20,20)); 
  130.         priceField.setPreferredSize(new Dimension(20,20));
  131.         getContentPane().add(priceField); 
  132.  
  133.         //item number of cd
  134.         itemLabel.setText("Item Number"); 
  135.         getContentPane().add(itemLabel); 
  136.  
  137.         itemField.setMinimumSize(new Dimension(5,20)); 
  138.         itemField.setPreferredSize(new Dimension(5,20));
  139.         getContentPane().add(itemField); 
  140.  
  141.  
  142.  
  143.         // add listeners
  144.  
  145.         btnAdd.setText("Add");
  146.         btnAdd.addActionListener(new ActionListener()
  147.         {
  148.             public void actionPerformed(ActionEvent evt)
  149.             {
  150.                 btnAddActionPerformed(evt);
  151.             }
  152.         });
  153.         getContentPane().add(btnAdd);
  154.  
  155.         // PREVIOUS
  156.         btnPrev.setText("Previous");
  157.         btnPrev.addActionListener(new ActionListener()
  158.         {
  159.             public void actionPerformed(ActionEvent evt)
  160.             {
  161.                 btnPrevActionPerformed(evt);
  162.             }
  163.         });
  164.         getContentPane().add(btnPrev);
  165.  
  166.         // NEXT
  167.         btnNext.setText("Next");
  168.         btnNext.addActionListener(new ActionListener()
  169.         {
  170.             public void actionPerformed(ActionEvent evt)
  171.             {
  172.                 btnNextActionPerformed(evt);
  173.             }
  174.         });
  175.         getContentPane().add(btnNext);
  176.  
  177.         // SEARCH
  178.         btnSearch.setText("Search");
  179.         btnSearch.addActionListener(new ActionListener()
  180.         {
  181.             public void actionPerformed(ActionEvent evt)
  182.             {
  183.                 btnAddActionPerformed(evt);
  184.             }
  185.         });
  186.         getContentPane().add(btnSearch);
  187.  
  188.         // FIRST
  189.         btnFirst.setText("First");
  190.         btnFirst.addActionListener(new ActionListener()
  191.         {
  192.             public void actionPerformed(ActionEvent evt)
  193.             {
  194.                 btnFirstActionPerformed(evt);
  195.             }
  196.         });
  197.         getContentPane().add(btnFirst);
  198.  
  199.         // LAST
  200.         btnLast.setText("Last");
  201.         btnLast.addActionListener(new ActionListener()
  202.         {
  203.             public void actionPerformed(ActionEvent evt)
  204.             {
  205.                 btnLastActionPerformed(evt);
  206.             }
  207.         });
  208.         getContentPane().add(btnLast);
  209.  
  210.         // MODIFY
  211.         btnModify.setText("Modify");
  212.         btnModify.addActionListener(new ActionListener()
  213.         {
  214.             public void actionPerformed(ActionEvent evt)
  215.             {
  216.                 btnModifyActionPerformed(evt);
  217.             }
  218.         });
  219.         getContentPane().add(btnModify);
  220.  
  221.         // SAVE
  222.         btnSave.setText("Save");
  223.         btnSave.addActionListener(new ActionListener()
  224.         {
  225.             public void actionPerformed(ActionEvent evt)
  226.             {
  227.                 btnAddActionPerformed(evt);
  228.             }
  229.         });
  230.         getContentPane().add(btnSave);
  231.  
  232.         // DELETE
  233.         btnDel.setText("Delete");
  234.         btnDel.addActionListener(new ActionListener()
  235.         {
  236.             public void actionPerformed(ActionEvent evt)
  237.             {
  238.                 btnDeleteActionPerformed(evt);
  239.             }
  240.         });
  241.         getContentPane().add(btnDel);
  242.  
  243.  
  244.         // new Jlist model
  245.         listModel = new DefaultListModel();
  246.         Inventorylist.setModel(listModel);
  247.  
  248.         jScrollPanel.setViewportView(Inventorylist);
  249.  
  250.         getContentPane().add(jScrollPanel);
  251.  
  252.         pack();
  253.     }// close
  254.  
  255.  
  256.         private void btnAddActionPerformed(ActionEvent evt)
  257.         {
  258.             // Create cd to add
  259.             CdwArtist newCD = new CdwArtist();
  260.             newCD.setArtist(artistField.getText());
  261.             newCD.setName(cdNameField.getText());    
  262.             newCD.setItemno(Integer.parseInt(itemField.getText()));
  263.             newCD.setNstock(Integer.parseInt(nstockField.getText()));
  264.             newCD.setPrice(Float.parseFloat(priceField.getText()));
  265.  
  266.             // Add cd to list
  267.             listModel.addElement(newCD);
  268.             currCD = listModel.size()-1;  // sets currCD to added index
  269.  
  270.  
  271.             // Clear the text fields after add
  272.             artistField.setText(null);
  273.             cdNameField.setText(null);    
  274.             itemField.setText(null);
  275.             nstockField.setText(null);
  276.          priceField.setText(null);
  277.  
  278.             }// end ADD
  279.  
  280.         private void btnPrevActionPerformed(ActionEvent evt)
  281.         {
  282.             // Grab Previous cd 
  283.             if (--currCD<0) currCD = listModel.size()-1;
  284.             CdwArtist newCD = (CdwArtist) listModel.get( currCD );
  285.  
  286.  
  287.             artistField.setText(newCD.getArtist());
  288.             cdNameField.setText(newCD.getName());    
  289.             itemField.setText(String.valueOf(newCD.getItemno()));
  290.             nstockField.setText(String.valueOf(newCD.getNstock()));
  291.             priceField.setText(formatter.format(newCD.getPrice()));
  292.  
  293.  
  294.             }// end PREV
  295.  
  296.                 private void btnNextActionPerformed(ActionEvent evt)
  297.             {
  298.             // Grab Next cd 
  299.             if (++currCD >= listModel.size()) currCD= 0;
  300.             CdwArtist newCD = (CdwArtist) listModel.get( currCD );
  301.  
  302.  
  303.             artistField.setText(newCD.getArtist());
  304.             cdNameField.setText(newCD.getName());    
  305.             itemField.setText(String.valueOf(newCD.getItemno()));
  306.             nstockField.setText(String.valueOf(newCD.getNstock()));
  307.             priceField.setText(formatter.format(newCD.getPrice()));
  308.  
  309.  
  310.             }// end NEXT
  311.  
  312.  
  313.                 private void btnFirstActionPerformed(ActionEvent evt)
  314.             {
  315.             // Grab First cd 
  316.             CdwArtist newCD = (CdwArtist) listModel.get(0);
  317.  
  318.  
  319.             artistField.setText(newCD.getArtist());
  320.             cdNameField.setText(newCD.getName());    
  321.             itemField.setText(String.valueOf(newCD.getItemno()));
  322.             nstockField.setText(String.valueOf(newCD.getNstock()));
  323.             priceField.setText(formatter.format(newCD.getPrice()));
  324.  
  325.  
  326.             }// end FIRST
  327.  
  328.  
  329.                 private void btnLastActionPerformed(ActionEvent evt)
  330.             {
  331.             // Grab Last cd 
  332.             CdwArtist newCD = (CdwArtist) listModel.lastElement();
  333.  
  334.  
  335.             artistField.setText(newCD.getArtist());
  336.             cdNameField.setText(newCD.getName());    
  337.             itemField.setText(String.valueOf(newCD.getItemno()));
  338.             nstockField.setText(String.valueOf(newCD.getNstock()));
  339.             priceField.setText(formatter.format(newCD.getPrice()));
  340.  
  341.  
  342.             }// end LAST
  343.  
  344.                 private void btnDeleteActionPerformed(ActionEvent evt)
  345.             {
  346.             // Delete cd 
  347.             listModel.remove(currCD);
  348.  
  349.  
  350.             // Clear the text fields after delete
  351.             artistField.setText(null);
  352.             cdNameField.setText(null);    
  353.             itemField.setText(null);
  354.             nstockField.setText(null);
  355.          priceField.setText(null);
  356.  
  357.  
  358.             }// end DELETE
  359.  
  360.                 private void btnModifyActionPerformed(ActionEvent evt)
  361.             {
  362.             // Modify cd 
  363.             listModel.remove(currCD);
  364.  
  365.  
  366.             // Clear the text fields after delete
  367.             artistField.setText(null);
  368.             cdNameField.setText(null);    
  369.             itemField.setText(null);
  370.             nstockField.setText(null);
  371.          priceField.setText(null);
  372.  
  373.  
  374.             }// end Modify
  375.  
  376.         // run it
  377.         public static void main(String args[])
  378.         {
  379.         //JFrame frame = new JFrame( "CD Inventory Logo" );
  380.       //frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
  381.  
  382.       // create ShapesJPanel
  383.       //ShapesJPanel shapesJPanel = new ShapesJPanel();
  384.       //frame.add( shapesJPanel ); // add shapesJPanel to frame
  385.       //frame.setSize( 125, 200 ); // set frame size
  386.       //frame.setVisible( true ); // display frame
  387.         java.awt.EventQueue.invokeLater(new Runnable()
  388.             {
  389.             public void run()
  390.                 {
  391.                 new Inventory2().setVisible(true);
  392.                }
  393.             });
  394.         }
  395.  
  396. } // close class
Jul 31 '07 #1
23 1980
JosAH
11,448 Recognized Expert MVP
You do keep track of a 'currCD' all the time, so why don't you just delete the
current 'currCD' and insert a new one?

kind regards,

Jos
Jul 31 '07 #2
r035198x
13,262 MVP
I have not tested your code to see what you're talking about, but you should model your modify around your add rather than your delete. The difference with add should be that with modify you have a product to display first and when a save is done, you don't create a new product but simply override an existing one.
Jul 31 '07 #3
r035198x
13,262 MVP
You do keep track of a 'currCD' all the time, so why don't you just delete the
current 'currCD' and insert a new one?

kind regards,

Jos
I haven't looked at the code but I would think they have a unique key for each product that they want to mantain after an edit.
Jul 31 '07 #4
JosAH
11,448 Recognized Expert MVP
I haven't looked at the code but I would think they have a unique key for each product that they want to mantain after an edit.
No he hasn't; check out the btnAddActionPer formed() logic: it just adds a new
CD to the list no matter what. A delete/insert pair would do fine for an update
here.

kind regards,

Jos
Jul 31 '07 #5
r035198x
13,262 MVP
No he hasn't; check out the btnAddActionPer formed() logic: it just adds a new
CD to the list no matter what. A delete/insert pair would do fine for an update
here.

kind regards,

Jos
I just thought even if he had some key, he could then create the new one using that old key anyway ...
Jul 31 '07 #6
no1zson
38 New Member
That is on the horizon ... sort of.
I will be changing the itemno field to stay in order. For example,
if I have 10 cds, they should be labeled 1-10 in order.
if we delete # 8, the remaining 9 should reorder accordingly ... if we add one, it should automatically take on the next number in line.

I do not think that will affect this current task at all though.
like listmodel.remov e, listmodel.add, listmodel.firss t and all that, I was hoping for a quick listmode.modify ... but if it does not exist I am willing to do a quick delete add.

this is what I have now:
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  1. private void btnModifyActionPerformed(ActionEvent evt)
  2.             {
  3.             // Modify cd
  4.             //listModel.addElement(newCD);
  5.             CdwArtist newCD = (CdwArtist) listModel.get( currCD );
  6.             newCD.setArtist(artistField.getText());
  7.             newCD.setName(cdNameField.getText());    
  8.             newCD.setItemno(Integer.parseInt(itemField.getText()));
  9.             newCD.setNstock(Integer.parseInt(nstockField.getText()));
  10.             newCD.setPrice(Float.parseFloat(priceField.getText()));
  11.  
  12.  
  13.             // Clear the text fields after Modify
  14.             artistField.setText(null);
  15.             cdNameField.setText(null);    
  16.             itemField.setText(null);
  17.             nstockField.setText(null);
  18.          priceField.setText(null);
  19.  
  20.  
  21.             }// end Modify
Jul 31 '07 #7
no1zson
38 New Member
I have tried to Delete current, and then Add new cd but it is not working.

Can you see my problem? Logic being, delete whatever cd I am currently looking at, take what is in the fields at that time (modified data) and create a new element. After new element is added, clear fields.
Expand|Select|Wrap|Line Numbers
  1.     // Modify cd
  2.             listModel.remove(currCD);
  3.  
  4.             // Create cd to add
  5.             CdwArtist newCD = new CdwArtist();
  6.             newCD.setArtist(artistField.getText());
  7.             newCD.setName(cdNameField.getText());    
  8.             newCD.setItemno(Integer.parseInt(itemField.getText()));
  9.             newCD.setNstock(Integer.parseInt(nstockField.getText()));
  10.             newCD.setPrice(Float.parseFloat(priceField.getText()));
  11.  
  12.             // Add cd to list
  13.             listModel.addElement(newCD);
  14.             currCD = listModel.size()-1;  // sets currCD to added index
  15.  
  16.  
  17.             // Clear the text fields after add
  18.             artistField.setText(null);
  19.             cdNameField.setText(null);    
  20.             itemField.setText(null);
  21.             nstockField.setText(null);
  22.          priceField.setText(null);
Jul 31 '07 #8
JosAH
11,448 Recognized Expert MVP
I have tried to Delete current, and then Add new cd but it is not working.
You have to elaborate a bit on what 'not working' means. Is the old CD gone?
Isn't the new CD added? Adre they both there in the list? Are none of the two
present in the list?

kind regards,

Jos
Jul 31 '07 #9
no1zson
38 New Member
You are correct, I am sorry. (new to this)
When I hit Modify ..
The last entered cd into my list is deleted, NOT the one I have in the fields ... then I get these errors
Expand|Select|Wrap|Line Numbers
  1. ---jGRASP exec: java Inventory2
  2.  
  3. Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "$1.00"
  4.     at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1224)
  5.     at java.lang.Float.parseFloat(Float.java:422)
  6.     at Inventory2.btnModifyActionPerformed(Inventory2.java:374)
  7.     at Inventory2.access$500(Inventory2.java:11)
  8.     at Inventory2$7.actionPerformed(Inventory2.java:219)
  9.     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
  10.     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
  11.     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
  12.     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
  13.     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
  14.     at java.awt.Component.processMouseEvent(Component.java:6038)
  15.     at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)
  16.     at java.awt.Component.processEvent(Component.java:5803)
  17.     at java.awt.Container.processEvent(Container.java:2058)
  18.     at java.awt.Component.dispatchEventImpl(Component.java:4410)
  19.     at java.awt.Container.dispatchEventImpl(Container.java:2116)
  20.     at java.awt.Component.dispatchEvent(Component.java:4240)
  21.     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
  22.     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
  23.     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
  24.     at java.awt.Container.dispatchEventImpl(Container.java:2102)
  25.     at java.awt.Window.dispatchEventImpl(Window.java:2429)
  26.     at java.awt.Component.dispatchEvent(Component.java:4240)
  27.     at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
  28.     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
  29.     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
  30.     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
  31.     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
  32.     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
  33.     at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Jul 31 '07 #10

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