Getting unique values from an arraylist

Hi
I have an arraylist that contains stringbuffer objects. The arraylist has duplicate values of the objects. I have to create another arraylist with only the unique values from the first arraylist. I tried it many ways and using many functions, but no luck. Can someone provide me the code for this , as i need to do this urgently.
Thank U
Mansoor,

> Sanity check: when are StringBuffers equal?
Same character sequence.
[EDIT] Or so I thought. Just tested, and found I was wrong. A quick glance at the API confirmed my error; StringBuffer doesn't override Object.equals().
~

Similar Messages

Getting unique values from internal table

Hi Gurus,
From time to time I hit this problem and so far I havn't found any nice solution. I've an internal table with several fields. I would like to get all unique values for one (or several) of these fields. However let say that this table has a lot of entries so making a copy is not an option. Also changing this table in any way is forbiden.
For example for table below I would like to get all unique values for field Number. In this case it would be 1,2,3,4.
Name | Number |
name1 | 1|
name2 | 2|
name3 | 2|
name4 | 3|
name5 | 4|
name5 | 3|
Can anyone propose me better solution than going in the loop through all entries in table? Maybe there is some ABAP functionality that I don't know about?
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Marcin Cholewczuk

Let's say that if I sort this table I won't be able to restore it to previous order which is important for me
True...If you sort the table you won't be able to restore. So the only option is to copy/move all the records into another table.
Sorting If you need to retrive unique values. I don't think without sorting the table would be a nice idea and proper programming to proceed ahead.
Regarding logic, as replied earlier
Either we can go with DELETE ADJACENT DUPLICATES or proceed as replied in my earlier post. There might be number of algorithms to resolve this. But we cannot go ahead without sorting or looping.

Get unique values from Parent List in Dropdown List SPServices

I have a dropdown list created using the SPServices ($().SPServices.SPCascadeDropdowns). It works as it should, I just need to add a requirement. I need to be able to filter the Parent Lookup list to show only unique values.
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I followed some of the recommendations from this blog:
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I this is what I tried:
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Thanks for looking into this. I'm not sure this would work: SPServices.SPCascadeDropdowns
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EM

Getting unique values from a list using XSL

I have a requirement to dynamically generate a unique list of categories that will be used to populate a drop-down box.
The XML that is being sent is in a format similar to this...
<item>
<title>random text1</title>
<category>research</category>
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<category>industry</category>
</item>
<item>
<title>random text2</title>
<category>research</category>
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<item>
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<xsl:param name="cat">all</xsl:param>
<xsl:key name="uniqueCategoryKey" match="item" use="./category"/>
<select name="cat">
<option value="all">all</option>
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               </xsl:when>
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          </xsl:choose>
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</select>
Any help appreciated on how to proceed
Thanks

Try changing these two lines:
<xsl:key name="uniqueCategoryKey" match="/" use="/item/category"/>
<xsl:for-each select="//[generate-id() = generate-id(key('uniqueCategoryKey', /item/category))]">And go back and read the article which you got the <xsl:key> idea from. It should explain why it did things that way. Understand that explanation and you should be able to modify the code to do what you like.

Getting unique values from a column within a hierarchy

I'm sort of new to working with databases and oracle so this is probably a beginner-ish question. I'm using oracle 9i on this.
I have a database that contains a table with an organizational hierarchy (dept_id, dept_name, parent_id), and another that contains a list of items for each department (like dept_id, item_id). Item_id joins with another table for the actual description of the items. Each department may have many items, and the departments may overlap with the items included in each.
I only want to contain that item list for leaf nodes in the hierarchy and for any departments that are not at the bottom, have a query pull a list of all unique items contained by its children, without the overlap. I know I can use START WITH and CONNECT BY to traverse the hierarchy but I'm not sure how I'd put all these pieces together into one query to get what I want, so I'd really appreciate help.

can you pls post a sample data and the output you are looking for.

Get unique value for a range of values from a table

Please help to identify the sql to get unique value for following scenario
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user7666373 wrote:
Please help to identify the sql to get unique value for following scenarioUnique combinations of three columns? If so:
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Select Statement to Get Unique values in a Column

I am trying to figure out how to get all the unique values from a
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select code from atable sort unique?
I am running 8.1.7
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Thanks,

Hi,
Here is the code for that.
Select empno from emp
group by empno
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Regards,
Ganesh R

Extracting unique values from (non-category) columns for chart

Hello:
I've created a worksheet to keep inventory of my Intellivision games. It has the following columns:
Publisher
Class
Network
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Quantity
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The "Class" represents whether the game is "complete in box" or "loose cartridge." The "Network" represents the general genre or game cateogory. The quantity is how much I have of each.
I have set the first three columns as categories: Publisher, Class, and Network. I also created a bar chart based on the Title and Quantity columns, to show how many I have of each.
The problem I have is that, although it looks real cool and helps me keep the games organized, since a title can appear in more than one "Class" (e.g., I can have one in box, and two loose), the chart includes duplicates, and they are not grouped together.
Is there a way that I can create a graph (or a secondary table) that exctracts only the UNIQUE values from a column that may contain duplicates?
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-dZ.

From the Numbers Help Menu, download the Numbers User Guide. Read the first three or four chapters to get a feel for the app. It's well written and won't take long to read that much.
Then use the Table of Contents and the Search tool to get additional specific directions.
First, delete all unneeded Rows and Columns from your data table. If you have patches of data in a larger table, Cut the patches and Paste them to a blank Sheet area to create separate dedicated tables for your various needs. These small special purpose tables are like Named Ranges in Excel. Name them in the Sheets Pane.
This is how Numbers was intended to be used. The User Guide will describe how to reference cells in one table from expressions in another table. If you use the point and click method of creating references from within the equation editor it won't matter a bit that the tables are separate.
Come back here for specific help on anything you are having trouble with.
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Hi Kranthi,
Every webdynpro component has a global controller called the component controller which is visible to all other controllers within the component.So whenever you want to share some data in between 2 different views you can just make it a point to use the component controller's context for the same. For your requirement (within your popups view context) you will have have to copy the component controllers context to your view. You then will have to (programmatically) fill this context with your desired data in this popup view. You can then be able to read this context from whichever view you want. I hope that this would have made it clear for you. Am also giving you an [example|http://****************/Tutorials/WebDynproABAP/Modalbox/page1.htm] which you can go through which would give you a perfect understanding of all this. In this example the user has an input field in the main view. The user enters a customer number & presses on a pushbutton. The corresponding sales orders are then displayed in a popup window for the user. The user can then select any sales order & press on a button in the popup. These values would then get copied to the table in the main view.
Regards,
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How to get the values from a html form embedded in a swing container

Hi all,
I am developing an application in which i have to read a html file and display it in a swing container.That task i made it with the help of a tool.But now i want to get the values from that page.ie when the submit button is clicked all the values of that form should be retrived by a servlet/standalone application.I don't know how to proceed further.Any help in this regard will be very greatful
Thanks in advance,
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By parsing the HTML.

How to get multiple values from the list

I've a list of an item which I queried it from the database. I also created a button that will takes a selected items from the list when it was clicked. I used javabean to get the data from database.
<%     // clicked on Select District Button
Vector vselectedDistrict = new Vector();
Vector vdistrictID = new Vector();
String tmpSelectDistrict = "";
tmpSelectDistrict = request.getParameter("bSelectDistrict");
if(tmpSelectDistrict != null)
     // get multiple values from the list
     String[] selectedDistrict = request.getParameterValues("usrTDistrict");
     vselectedDistrict.clear();
     vdistrictID.clear();
     if((selectedDistrict != null) && (selectedDistrict.length != 0))
                       for(int i=0;i<selectedDistrict.length;i++)
               vselectedDistrict.addElement(selectedDistrict);
          vdistrictID = dbaseInfo.getcurrentDistrictID(nstate,vselectedDistrict);
          for(int i=0;i<vdistrictID.size();i++)
               out.println("district = " + selectedDistrict[i]);                         out.println("district ID= " + vdistrictID.get(i).toString());
%>
// get vdistrict from the database here......
<select name="usrTDistrict" size="5" multiple>
<%     for(int i = 0; i< vdistrict.size(); i++)
%>
     <option value="<%=vdistrict.get(i).toString()%>"><%=vdistrict.get(i).toString()%></option>
<%
%>
</select>
<input type="submit" name="bSelectDistrict" value="Select District">
Lets say the item that i selected from the list is 'Xplace' and I clicked on the Select District button,
what I got is this error message:
org.apache.jasper.JasperException: Unable to convert string 'Xplace' to class java.util.Vector for attribute usrTDistrict: java.lang.IllegalArgumentException: Property Editor not registered with the PropertyEditorManager
So where is going wrong and what the message means?. Any help very much appreciated. Thanks

These are just guesses that might hopefully steer you in directions you haven't looked in yet.
I presume you used triangle brackets (< >) to avoid having the Jive Forum think it was the "italics" tag?
Are you certain this: dbaseInfo.getcurrentDistrictID(nstate,vselectedDistrict);
expects a Vector as its second parameter? And returns a Vector?
I don't believe you've shown how you use the javabean, or its code? Perhaps it should be rewritten to accept an array of strings instead of a Vector?

Get column values from list of values programmatically

hi all
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If this answers your question , please close this thread by marking it as answered.
Thanks

How can i get all values from jtable with out selecting?

i have one input table and two output tables (name it as output1, output2). Selected rows from input table are displayed in output1 table. The data in output1 table is temporary(means the dat wont store in database just for display purpose).
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thanks in advance.
raja

You could set the table's data model to be the same:
output2.setModel( output1.getModel() );

Getting the Values from a Tiled View

Hi,
I have a TiledView and I have checkbox in the tiled view. I am trying
to get the values of the checked boxes.
I have coded like this.
Object[] links = getRSystemLinks().getCbSystemUrl().getValues();
if I see the links.length i get only one. In html If I see the code
it appends the TileIndex in brackets. If I replace the TileIndex with
0 in all the fields in endCbSystemUrl method I get the correct values.
In the TiledView beginDisplay() method my code is like this.
if (getPrimaryModel() == null) throw new ModelControlException
("Primary model is null");
super.beginDisplay();
resetTileIndex();
pgCustomizeLinksViewBean parentBean = (pgCustomizeLinksViewBean)
getParent();
((DatasetModel) getDefaultModel()).setSize
(parentBean.SystemChoicesValue.size());
Any Suggestions on this.
Thanks
Namburi

Namburi--
Remember, the getValues() method does not return the values from a column in
a TiledView. It is strictly for use by fields that can have multiple
values, like multi-select list boxes.
DO NOT remove the indexing feature from the field names, especially in the
case of checkboxes, because checkboxes aren't submitted back to the server
unless they are checked. By overriding the automatic checkbox tracking
feature JATO provides, you won't be able to tell which checkboxes were
actually checked by row--you'll simply get back a list the same size as the
number of checkboxes that were checked, without any placeholders for the
ones that weren't checked.
Instead, on submit, you simply need to move through the tiledView and check
the value of checkbox on each row:
tiledView.beforeFirst();
while (tiledView.next())
if (getDisplayFieldBooleanValue("myCheckBox"))
You can use the same construct to build up an array or list:
List checkedList=new LinkedList();
tiledView.beforeFirst();
while (tiledView.next())
if (getDisplayFieldBooleanValue("myCheckBox"))
checkedList.add(new Boolean(true))
else
checkedList.add(new Boolean(false))
Todd
Todd Fast
Senior Engineer
Sun Microsystems, Inc.
todd.fast@s...
----- Original Message -----
From: <vnamboori@y...>
Sent: Wednesday, October 17, 2001 3:49 PM
Subject: [iPlanet-JATO] Getting the Values from a Tiled View
Hi,
I have a TiledView and I have checkbox in the tiled view. I am trying
to get the values of the checked boxes.
I have coded like this.
Object[] links = getRSystemLinks().getCbSystemUrl().getValues();
if I see the links.length i get only one. In html If I see the code
it appends the TileIndex in brackets. If I replace the TileIndex with
0 in all the fields in endCbSystemUrl method I get the correct values.
In the TiledView beginDisplay() method my code is like this.
if (getPrimaryModel() == null) throw new ModelControlException
("Primary model is null");
super.beginDisplay();
resetTileIndex();
pgCustomizeLinksViewBean parentBean = (pgCustomizeLinksViewBean)
getParent();
((DatasetModel) getDefaultModel()).setSize
(parentBean.SystemChoicesValue.size());
Any Suggestions on this.
Thanks
Namburi
[email protected]

NullPointerException - Cannot get the value from variable f_cashGiven

In SubCheckout.java (a POS), what I want is when Payment button (f_cashPayment) is pressed, the action "Cash" is performed, get the value from Cash Given (f_cashGiven), do the subtraction and post the value as Cash Return (f_cashReturn). The code is filled in actionPerformed. But I cannot get the value by using f_cashGiven.getValue() from VNumber class. It returns NULL. This should be quite straight forward, but I do not know what is wrong. Please help!
Enclosed please find the source code of SubCheckout.java and VNumber.java
This is the code of SubCheckout.java :
* The contents of this file are subject to the   Compiere License Version 1.1
* ("License"); You may not use this file except in compliance with the License
* You may obtain a copy of the License at http://www.compiere.org/license.html
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
* The Original Code is Compiere ERP & CRM Smart Business Solution. The Initial
* Developer of the Original Code is Jorg Janke. Portions created by Jorg Janke
* are Copyright (C) 1999-2005 Jorg Janke.
* All parts are Copyright (C) 1999-2005 ComPiere, Inc. All Rights Reserved.
* Contributor(s): ______________________________________.
package org.compiere.pos;
import java.awt.*;
import java.awt.event.*;
import java.math.BigDecimal;
import javax.swing.border.*;
import org.compiere.grid.ed.*;
import org.compiere.swing.*;
import org.compiere.util.*;
*     POS Checkout Sub Panel
* @author Jorg Janke
* @version $Id: SubCheckout.java,v 1.3 2005/03/11 20:28:22 jjanke Exp $
public class SubCheckout extends PosSubPanel implements ActionListener
      *      Constructor
      *     @param posPanel POS Panel
     public SubCheckout (PosPanel posPanel)
          super (posPanel);
     }     //     PosSubCheckout
     private CButton f_register = null;
     private CButton f_summary = null;
     private CButton f_process = null;
     private CButton f_print = null;
     private CLabel f_lcreditCardNumber = null;
     private CTextField f_creditCardNumber = null;
     private CLabel f_lcreditCardExp = null;
     private CTextField f_creditCardExp = null;
     private CLabel f_lcreditCardVV = null;
     private CTextField f_creditCardVV = null;
     private CButton f_cashPayment = null;
     private CLabel f_lcashGiven = null;
     private VNumber f_cashGiven = null;
     private CLabel f_lcashReturn = null;
     private VNumber f_cashReturn = null;
     private CButton f_creditPayment = null;
     /**     Logger               */
     private static CLogger log = CLogger.getCLogger(SubCheckout.class);
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     public void init()
          //     Title
          TitledBorder border = new TitledBorder(Msg.getMsg(Env.getCtx(), "Checkout"));
          setBorder(border);
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          setLayout(new GridBagLayout());
          GridBagConstraints gbc = new GridBagConstraints();
          gbc.insets = INSETS2;
          //     --     0
          gbc.gridx = 0;
          f_register = createButtonAction("Register", null);
          gbc.gridy = 0;
          add (f_register, gbc);
          f_summary = createButtonAction("Summary", null);
          gbc.gridy = 1;
          add (f_summary, gbc);
          f_process = createButtonAction("Process", null);
          gbc.gridy = 2;
          add (f_process, gbc);
          f_print = createButtonAction("Print", null);
          gbc.gridy = 3;
          add (f_print, gbc);
          //     --     1 -- Cash
          gbc.gridx = 1;
          gbc.gridheight = 2;
          gbc.fill = GridBagConstraints.BOTH;
          gbc.weightx = .1;
          CPanel cash = new CPanel(new GridBagLayout());
          cash.setBorder(new TitledBorder(Msg.getMsg(Env.getCtx(), "Cash")));
          gbc.gridy = 0;
          add (cash, gbc);
          GridBagConstraints gbc0 = new GridBagConstraints();
          gbc0.insets = INSETS2;
          gbc0.anchor = GridBagConstraints.WEST;
          f_lcashGiven = new CLabel(Msg.getMsg(Env.getCtx(),"CashGiven"));
          cash.add (f_lcashGiven, gbc0);
          f_cashGiven = new VNumber("CashGiven", false, false, true, DisplayType.Amount,
               Msg.translate(Env.getCtx(), "CashGiven"));
          f_cashGiven.addActionListener(this);
          f_cashGiven.setColumns(10, 25);
          cash.add (f_cashGiven, gbc0);
          f_cashGiven.setValue(Env.ZERO);
          f_lcashReturn = new CLabel(Msg.getMsg(Env.getCtx(),"CashReturn"));
          cash.add (f_lcashReturn, gbc0);
          f_cashReturn = new VNumber("CashReturn", false, true, false, DisplayType.Amount,
               "CashReturn");
          f_cashReturn.setColumns(10, 25);
          cash.add (f_cashReturn, gbc0);
          f_cashReturn.setValue(Env.ZERO);
          f_cashPayment = createButtonAction("Payment", null);
          f_cashPayment.setActionCommand("Cash");
          gbc0.anchor = GridBagConstraints.EAST;
          gbc0.weightx = 0.1;
          cash.add (f_cashPayment, gbc0);
          //     --     1 -- Creditcard
          CPanel creditcard = new CPanel(new GridBagLayout());
          creditcard.setBorder(new TitledBorder(Msg.translate(Env.getCtx(), "CreditCardType")));
          gbc.gridy = 2;
          add (creditcard, gbc);
          GridBagConstraints gbc1 = new GridBagConstraints();
          gbc1.insets = INSETS2;
          gbc1.anchor = GridBagConstraints.WEST;
          gbc1.gridx = 0;
          gbc1.gridy = 0;
          f_lcreditCardNumber = new CLabel(Msg.translate(Env.getCtx(), "CreditCardNumber"));
          creditcard.add (f_lcreditCardNumber, gbc1);
          gbc1.gridy = 1;
          f_creditCardNumber = new CTextField(18);
          creditcard.add (f_creditCardNumber, gbc1);
          gbc1.gridx = 1;
          gbc1.gridy = 0;
          f_lcreditCardExp = new CLabel(Msg.translate(Env.getCtx(),"CreditCardExp"));
          creditcard.add (f_lcreditCardExp, gbc1);
          gbc1.gridy = 1;
          f_creditCardExp = new CTextField(5);
          creditcard.add (f_creditCardExp, gbc1);
          gbc1.gridx = 2;
          gbc1.gridy = 0;
          f_lcreditCardVV = new CLabel(Msg.translate(Env.getCtx(), "CreditCardVV"));
          creditcard.add (f_lcreditCardVV, gbc1);
          gbc1.gridy = 1;
          f_creditCardVV = new CTextField(5);
          creditcard.add (f_creditCardVV, gbc1);
          gbc1.gridx = 3;
          gbc1.gridy = 0;
          gbc1.gridheight = 2;
          f_creditPayment = createButtonAction("Payment", null);
          f_creditPayment.setActionCommand("CreditCard");
          gbc1.anchor = GridBagConstraints.EAST;
          gbc1.weightx = 0.1;
          creditcard.add (f_creditPayment, gbc1);
     }     //     init
      *      Get Panel Position
     public GridBagConstraints getGridBagConstraints()
          GridBagConstraints gbc = super.getGridBagConstraints();
          gbc.gridx = 0;
          gbc.gridy = 3;
          return gbc;
     }     //     getGridBagConstraints
      *      Dispose - Free Resources
     public void dispose()
          super.dispose();
     }     //     dispose
      *      Action Listener
      *     @param e event
     public void actionPerformed (ActionEvent e)
          String action = e.getActionCommand();
          if (action == null || action.length() == 0)
               return;
          log.info( "PosSubCheckout - actionPerformed: " + action);
          if (e.getSource() == f_cashGiven) {
               f_cashGiven.setValue(f_cashGiven.getValue());
               System.out.println("f_cashGiven"+f_cashGiven.getDisplay());
          //     Register
          //     Summary
          //     Print
          if (action.equals("Cash")) {
               BigDecimal CashGiven, GrandTotal, CashReturn;
               System.out.println("Cash given is "+f_cashGiven.getDisplay());
               CashGiven = (BigDecimal)f_cashGiven.getValue();
               GrandTotal = (BigDecimal)p_posPanel.f_curLine.getOrder().getGrandTotal();
               CashReturn = CashGiven.subtract(GrandTotal);
               f_cashReturn.setValue(CashReturn);
          //     Cash (Payment)
          //     CreditCard (Payment)
     }     //     actionPerformed
}     //     PosSubCheckoutThis is the code of VNumber.java :
* The contents of this file are subject to the   Compiere License Version 1.1
* ("License"); You may not use this file except in compliance with the License
* You may obtain a copy of the License at http://www.compiere.org/license.html
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
* The Original Code is Compiere ERP & CRM Smart Business Solution. The Initial
* Developer of the Original Code is Jorg Janke. Portions created by Jorg Janke
* are Copyright (C) 1999-2005 Jorg Janke.
* All parts are Copyright (C) 1999-2005 ComPiere, Inc. All Rights Reserved.
* Contributor(s): ______________________________________.
package org.compiere.grid.ed;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.math.*;
import java.text.*;
import java.util.logging.*;
import javax.swing.*;
import javax.swing.text.*;
import org.compiere.apps.*;
import org.compiere.model.*;
import org.compiere.swing.*;
import org.compiere.util.*;
*     Number Control
*      @author      Jorg Janke
*      @version      $Id: VNumber.java,v 1.41 2005/09/03 01:57:16 jjanke Exp $
public final class VNumber extends JComponent
     implements VEditor, ActionListener, KeyListener, FocusListener
     /**     Number of Columns (12)          */
     public final static int SIZE = 12;
      * IDE Bean Constructor
     public VNumber()
          this("Number", false, false, true, DisplayType.Number, "Number");
     }   // VNumber
      *     Create right aligned Number field.
      *     no popup, if WindowNo == 0 (for IDs)
      * @param columnName column name
      * @param mandatory mandatory
      * @param isReadOnly read only
      * @param isUpdateable updateable
      * @param displayType display type
      * @param title title
     public VNumber(String columnName, boolean mandatory, boolean isReadOnly, boolean isUpdateable,
          int displayType, String title)
          super();
          super.setName(columnName);
          m_columnName = columnName;
          m_title = title;
          setDisplayType(displayType);
          LookAndFeel.installBorder(this, "TextField.border");
          this.setLayout(new BorderLayout());
//          this.setPreferredSize(m_text.getPreferredSize());          //     causes r/o to be the same length
//          int height = m_text.getPreferredSize().height;
//          setMinimumSize(new Dimension (30,height));
          //     ***     Text     ***
          m_text.setBorder(null);
          m_text.setHorizontalAlignment(JTextField.TRAILING);
          m_text.addKeyListener(this);
          m_text.addFocusListener(this);
          //     Background
          setMandatory(mandatory);
          this.add(m_text, BorderLayout.CENTER);
          //     ***     Button     ***
          m_button.setIcon(Env.getImageIcon("Calculator10.gif"));
          m_button.setMargin(new Insets(0, 0, 0, 0));
          m_button.setFocusable(false);
          m_button.addActionListener(this);
          this.add (m_button, BorderLayout.EAST);
          //     Prefereed Size
          this.setPreferredSize(this.getPreferredSize());          //     causes r/o to be the same length
          // Size
          setColumns(SIZE, CComboBox.FIELD_HIGHT-4);
          //     ReadWrite
          if (isReadOnly || !isUpdateable)
               setReadWrite(false);
          else
               setReadWrite(true);
     }     //     VNumber
      * Dispose
     public void dispose()
          m_text = null;
          m_button = null;
          m_mField = null;
     }   // dispose
      *     Set Document
      * @param doc document
     protected void setDocument(Document doc)
          m_text.setDocument(doc);
     }     //     getDocument
     private String               m_columnName;
     protected int               m_displayType;     // Currency / UoM via Context
     private DecimalFormat     m_format;
     private String               m_title;
     private boolean               m_setting;
     private String               m_oldText;
     private String               m_initialText;
     private boolean               m_rangeSet = false;
     private Double               m_minValue;
     private Double               m_maxValue;
     private boolean               m_modified = false;
     /** The Field                  */
     private CTextField          m_text = new CTextField(SIZE);     //     Standard
     /** The Button                  */
     private CButton              m_button = new CButton();
     private MField          m_mField = null;
     /**     Logger               */
     private static CLogger log = CLogger.getCLogger(VNumber.class);
      *      Set no of Columns
      *     @param columns columns
     public void setColumns (int columns, int height)
          m_text.setPreferredSize(null);
          m_text.setColumns(columns);
          Dimension size = m_text.getPreferredSize();
          if (height > size.height)               //     default 16
               size.height = height;
          if (CComboBox.FIELD_HIGHT-4 > size.height)
               size.height = VLookup.FIELD_HIGHT-4;
          this.setPreferredSize(size);          //     causes r/o to be the same length
          this.setMinimumSize(new Dimension (columns*10, size.height));
          m_button.setPreferredSize(new Dimension(size.height, size.height));
     }     //     setColumns
      *     Set Range with min & max
      * @param minValue min value
      * @param maxValue max value
      *     @return true, if accepted
     public boolean setRange(Double minValue, Double maxValue)
          m_rangeSet = true;
          m_minValue = minValue;
          m_maxValue = maxValue;
          return m_rangeSet;
     }     //     setRange
      *     Set Range with min & max = parse US style number w/o Gouping
      * @param minValue min value
      * @param maxValue max value
      * @return true if accepted
     public boolean setRange(String minValue, String maxValue)
          if (minValue == null || maxValue == null)
               return false;
          try
               m_minValue = Double.valueOf(minValue);
               m_maxValue = Double.valueOf(maxValue);
          catch (NumberFormatException nfe)
               return false;
          m_rangeSet = true;
          return m_rangeSet;
     }     //     setRange
      * Set and check DisplayType
      * @param displayType display type
     public void setDisplayType (int displayType)
          m_displayType = displayType;
          if (!DisplayType.isNumeric(displayType))
               m_displayType = DisplayType.Number;
          m_format = DisplayType.getNumberFormat(displayType);
          m_text.setDocument (new MDocNumber(displayType, m_format, m_text, m_title));
     }   // setDisplayType
      *     Set ReadWrite
      * @param value value
     public void setReadWrite (boolean value)
          if (m_text.isReadWrite() != value)
               m_text.setReadWrite(value);
          if (m_button.isReadWrite() != value)
               m_button.setReadWrite(value);
          //     Don't show button if not ReadWrite
          if (m_button.isVisible() != value)
               m_button.setVisible(value);
     }     //     setReadWrite
      *     IsReadWrite
      * @return true if rw
     public boolean isReadWrite()
          return m_text.isReadWrite();
     }     //     isReadWrite
      *     Set Mandatory (and back bolor)
      * @param mandatory mandatory
     public void setMandatory (boolean mandatory)
          m_text.setMandatory(mandatory);
     }     //     setMandatory
      *     Is it mandatory
      * @return true if mandatory
     public boolean isMandatory()
          return m_text.isMandatory();
     }     //     isMandatory
      *     Set Background
      * @param color color
     public void setBackground(Color color)
          m_text.setBackground(color);
     }     //     setBackground
      *     Set Background
      * @param error error
     public void setBackground (boolean error)
          m_text.setBackground(error);
     }     //     setBackground
      * Set Foreground
      * @param fg foreground
     public void setForeground(Color fg)
          m_text.setForeground(fg);
     }   // setForeground
      *     Set Editor to value
      * @param value value
     public void setValue(Object value)
          log.finest("Value=" + value);
          if (value == null)
               m_oldText = "";
          else
               m_oldText = m_format.format(value);
          //     only set when not updated here
          if (m_setting)
               return;
          m_text.setText (m_oldText);
          m_initialText = m_oldText;
          m_modified = false;
     }     //     setValue
      * Property Change Listener
      * @param evt event
     public void propertyChange (PropertyChangeEvent evt)
          if (evt.getPropertyName().equals(org.compiere.model.MField.PROPERTY))
               setValue(evt.getNewValue());
     }   // propertyChange
      *     Return Editor value
      * @return value value (big decimal or integer)
     public Object getValue()
          if (m_text == null || m_text.getText() == null || m_text.getText().length() == 0)
               return null;
          String value = m_text.getText();
          //     return 0 if text deleted
          if (value == null || value.length() == 0)
               if (!m_modified)
                    return null;
               if (m_displayType == DisplayType.Integer)
                    return new Integer(0);
               return Env.ZERO;
          if (value.equals(".") || value.equals(",") || value.equals("-"))
               value = "0";
          try
               Number number = m_format.parse(value);
               value = number.toString();      //     converts it to US w/o thousands
               BigDecimal bd = new BigDecimal(value);
               if (m_displayType == DisplayType.Integer)
                    return new Integer(bd.intValue());
               if (bd.signum() == 0)
                    return bd;
               return bd.setScale(m_format.getMaximumFractionDigits(), BigDecimal.ROUND_HALF_UP);
          catch (Exception e)
               log.log(Level.SEVERE, "Value=" + value, e);
          if (m_displayType == DisplayType.Integer)
               return new Integer(0);
          return Env.ZERO;
     }     //     getValue
      * Return Display Value
      * @return value
     public String getDisplay()
          return m_text.getText();
     }   // getDisplay
      *      Get Title
      *     @return title
     public String getTitle()
          return m_title;
     }     //     getTitle
      *      Plus - add one.
      *      Also sets Value
      *     @return new value
     public Object plus()
          Object value = getValue();
          if (value == null)
               if (m_displayType == DisplayType.Integer)
                    value = new Integer(0);
               else
                    value = Env.ZERO;
          //     Add
          if (value instanceof BigDecimal)
               value = ((BigDecimal)value).add(Env.ONE);
          else
               value = new Integer(((Integer)value).intValue() + 1);
          setValue(value);
          return value;
     }     //     plus
      *      Minus - subtract one, but not below minimum.
      *      Also sets Value
      *     @param minimum minimum
      *     @return new value
     public Object minus (int minimum)
          Object value = getValue();
          if (value == null)
               if (m_displayType == DisplayType.Integer)
                    value = new Integer(minimum);
               else
                    value = new BigDecimal(minimum);
               setValue(value);
               return value;
          //     Subtract
          if (value instanceof BigDecimal)
               BigDecimal bd = ((BigDecimal)value).subtract(Env.ONE);
               BigDecimal min = new BigDecimal(minimum);
               if (bd.compareTo(min) < 0)
                    value = min;
               else
                    value = bd;
          else
               int i = ((Integer)value).intValue();
               i--;
               if (i < minimum)
                    i = minimum;
               value = new Integer(i);
          setValue(value);
          return value;
     }     //     minus
      *     Action Listener
      * @param e event
     public void actionPerformed (ActionEvent e)
          log.config(e.getActionCommand());
          if (ValuePreference.NAME.equals(e.getActionCommand()))
               if (MRole.getDefault().isShowPreference())
                    ValuePreference.start (m_mField, getValue());
               return;
          if (e.getSource() == m_button)
               m_button.setEnabled(false);
               String str = startCalculator(this, m_text.getText(), m_format, m_displayType, m_title);
               m_text.setText(str);
               m_button.setEnabled(true);
               try
                    fireVetoableChange (m_columnName, m_oldText, getValue());
               catch (PropertyVetoException pve)     {}
               m_text.requestFocus();
     }     //     actionPerformed
      *     Key Listener Interface
      * @param e event
     public void keyTyped(KeyEvent e)    {}
     public void keyPressed(KeyEvent e) {}
      *     Key Listener.
      *          - Escape           - Restore old Text
      *          - firstChange     - signal change
      * @param e event
     public void keyReleased(KeyEvent e)
          log.finest("Key=" + e.getKeyCode() + " - " + e.getKeyChar()
                       + " -> " + m_text.getText());
          // ESC
          if (e.getKeyCode() == KeyEvent.VK_ESCAPE)
               m_text.setText(m_initialText);
          m_modified = true;
          m_setting = true;
          try
               if (e.getKeyCode() == KeyEvent.VK_ENTER)     //     10
                    fireVetoableChange (m_columnName, m_oldText, getValue());
                    fireActionPerformed();
               else     //     indicate change
                    fireVetoableChange (m_columnName, m_oldText, null);
          catch (PropertyVetoException pve)     {}
          m_setting = false;
     }     //     keyReleased
      *     Focus Gained
      * @param e event
     public void focusGained (FocusEvent e)
          if (m_text != null)
               m_text.selectAll();
     }     //     focusGained
      *     Data Binding to MTable (via GridController.vetoableChange).
      * @param e event
     public void focusLost (FocusEvent e)
     //          log.finest(e.toString());
          //     APanel - Escape
          if (e.getOppositeComponent() instanceof AGlassPane)
               m_text.setText(m_initialText);
               return;
          try
               fireVetoableChange (m_columnName, m_initialText, getValue());
               fireActionPerformed();
          catch (PropertyVetoException pve)     {}
     }   // focusLost
      *     Invalid Entry - Start Calculator
      * @param jc parent
      * @param value value
      * @param format format
      * @param displayType display type
      * @param title title
      * @return value
     public static String startCalculator(Container jc, String value,
          DecimalFormat format, int displayType, String title)
          log.config("Value=" + value);
          BigDecimal startValue = new BigDecimal(0.0);
          try
               if (value != null && value.length() > 0)
                    Number number = format.parse(value);
                    startValue = new BigDecimal (number.toString());
          catch (ParseException pe)
               log.info("InvalidEntry - " + pe.getMessage());
          //     Find frame
          Frame frame = Env.getFrame(jc);
          //     Actual Call
          Calculator calc = new Calculator(frame, title,
               displayType, format, startValue);
          AEnv.showCenterWindow(frame, calc);
          BigDecimal result = calc.getNumber();
          log.config( "Result=" + result);
          calc = null;
          if (result != null)
               return format.format(result);
          else
               return value;          //     original value
     }     //     startCalculator
      * Set Field/WindowNo for ValuePreference
      * @param mField field
     public void setField (MField mField)
          m_mField = mField;
          if (m_mField != null
               && MRole.getDefault().isShowPreference())
               ValuePreference.addMenu (this, popupMenu);
     }   // setField
      *      Remove Action Listner
      *      @param l Action Listener
     public void removeActionListener(ActionListener l)
          listenerList.remove(ActionListener.class, l);
     }     //     removeActionListener
      *      Add Action Listner
      *      @param l Action Listener
     public void addActionListener(ActionListener l)
          listenerList.add(ActionListener.class, l);
     }     //     addActionListener
      *      Fire Action Event to listeners
     protected void fireActionPerformed()
          int modifiers = 0;
          AWTEvent currentEvent = EventQueue.getCurrentEvent();
          if (currentEvent instanceof InputEvent)
               modifiers = ((InputEvent)currentEvent).getModifiers();
          else if (currentEvent instanceof ActionEvent)
               modifiers = ((ActionEvent)currentEvent).getModifiers();
          ActionEvent ae = new ActionEvent (this, ActionEvent.ACTION_PERFORMED,
               "VNumber", EventQueue.getMostRecentEventTime(), modifiers);
          // Guaranteed to return a non-null array
          Object[] listeners = listenerList.getListenerList();
          // Process the listeners last to first, notifying those that are interested in this event
          for (int i = listeners.length-2; i>=0; i-=2)
               if (listeners==ActionListener.class)
                    ((ActionListener)listeners[i+1]).actionPerformed(ae);
     }     //     fireActionPerformed
}     //     VNumber

If getValue() returns null, you need to trace the execution of the code and figure out which sequence of code is leading to the return of null. This method looks complex - a lot of if statements. If you do not have a debugger, put System.out.println statements inside the method to figure out what's going on.

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