Get numerical values from 2D array of string

Hello!
I start by saying that I have a base knowledge of LabView. I'm using LabView 2011. I'm doing some communications test via Can-Bus protocol. As you can see in pictures of the block diagram and of the front panel that I've attached I'm using "Transmit Receive same Port" LabView example. It works very good but I would need to insert the 8 data bytes that I receive from the server in 8 different numerical variables so that I could use them to make some operations. How can I get numerical values from the 2D array of string that I attached?
Every example that you can provide is important!
Thank you very much!
Attachments:
1.jpg ‏69 KB
2.jpg ‏149 KB

Hi martiflix,
ehm: to unbundle data from a cluster I would use the function Unbundle(ByName)…
When you are new to LabVIEW you should take all the FREE online resources offered by NI on their website!
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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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): ______________________________________.
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import org.compiere.swing.*;
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* 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): ______________________________________.
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import java.math.*;
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import org.compiere.model.*;
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     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.

Swing: when trying to get the values from a JTable inside an event handler

Hi,
I am trying to write a graphical interface to compute the Gauss Elimination procedure for solving linear systems. The class for computing the output of a linear system already works fine on console mode, but I am fighting a little bit to make it work with Swing.
I put two buttons (plus labels) and a JTextField . The buttons have the following role:
One of them gets the value from the JTextField and it will be used to the system dimension. The other should compute the solution. I also added a JTable so that the user can type the values in the screen.
So whenever the user hits the button Dimensiona the program should retrieve the values from the table cells and pass them to a 2D Array. However, the program throws a NullPointerException when I try to
do it. I have put the code for copying this Matrix inside a method and I call it from the inner class event handler.
I would thank you very much for the help.
Daniel V. Gomes
here goes the code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import AdvanceMath.*;
public class MathF2 extends JFrame {
private JTextField ArrayOfFields[];
private JTextField DimOfSis;
private JButton Calcular;
private JButton Ativar;
private JLabel label1;
private JLabel label2;
private Container container;
private int value;
private JTable DataTable;
private double[][] A;
private double[] B;
private boolean dimensionado = false;
private boolean podecalc = false;
public MathF2 (){
super("Math Calcs");
Container container = getContentPane();
container.setLayout( new FlowLayout(FlowLayout.CENTER) );
Calcular = new JButton("Resolver");
Calcular.setEnabled(false);
Ativar = new JButton("Dimensionar");
label1 = new JLabel("Clique no bot�o para resolver o sistema.");
label2 = new JLabel("Qual a ordem do sistema?");
DimOfSis = new JTextField(4);
DimOfSis.setText("0");
JTable DataTable = new JTable(10,10);
container.add(label2);
container.add(DimOfSis);
container.add(Ativar);
container.add(label1);
container.add(Calcular);
container.add(DataTable);
for ( int i = 0; i < 10 ; i ++ ){
for ( int j = 0 ; j < 10 ; j++) {
DataTable.setValueAt("0",i,j);
myHandler handler = new myHandler();
Calcular.addActionListener(handler);
Ativar.addActionListener(handler);
setSize( 500 , 500 );
setVisible( true );
public static void main ( String args[] ){
MathF2 application = new MathF2();
application.addWindowListener(
new WindowAdapter(){
public void windowClosing (WindowEvent event)
System.exit( 0 );
private class myHandler implements ActionListener {
public void actionPerformed ( ActionEvent event ){
if ( event.getSource()== Calcular ) {
if ( event.getSource()== Ativar ) {
//dimensiona a Matriz A
if (dimensionado == false) {
if (DimOfSis.getText()=="0") {
value = 2;
} else {
value = Integer.parseInt(DimOfSis.getText());
dimensionado = true;
Ativar.setEnabled(false);
System.out.println(value);
} else {
Ativar.setEnabled(false);
Calcular.setEnabled(true);
podecalc = true;
try {
InitValores( DataTable, value );
} catch (Exception e) {
System.out.println("Erro ao criar matriz" + e );
private class myHandler2 implements ItemListener {
public void itemStateChanged( ItemEvent event ){
private void InitValores( JTable table, int n ) {
A = new double[n][n];
B = new double[n];
javax.swing.table.TableModel model = table.getModel();
for ( int i = 0 ; i < n ; i++ ){
for (int j = 0 ; j < n ; j++ ){
Object temp1 = model.getValueAt(i,j);
String temp2 = String.valueOf(temp1);
A[i][j] = Double.parseDouble(temp2);

What I did is set up a :
// This code will setup a listener for the table to handle a selection
players.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = players.getSelectionModel();
rowSM.addListSelectionListener(new Delete_Player_row_Selection(this));
//Class will take the event and call a method inside the Delete_Player object.
class Delete_Player_row_Selection
implements javax.swing.event.ListSelectionListener
Delete_Player adaptee;
Delete_Player_row_Selection (Delete_Player temp)
adaptee = temp;
public void valueChanged (ListSelectionEvent listSelectionEvent)
adaptee.row_Selection(listSelectionEvent);
in the row_Selection function
if(ex.getValueIsAdjusting()) //To remove double selection
return;
ListSelectionModel lsm = (ListSelectionModel) ex.getSource();
if(lsm.isSelectionEmpty())
System.out.println("EMtpy");
else
int selected_row = lsm.getMinSelectionIndex();
ResultSetTableModel model = (ResultSetTableModel) players.getModel();
String name = (String) model.getValueAt(selected_row, 1);
Integer id = (Integer) model.getValueAt(selected_row, 3);
This is how I got info out of a table when the user selected it

Need help assigning values to an array of Strings

why do i get an error message saying this isn't a statement?
String customer[z] = {"::" + s1 + ":" + s2 + ":" + s3};
what is the correct syntax for assigning values to an array of strings?

help helpArrays in Java are static, meaning their size cannot change once they've been created. Somewhere in your code you need to declare the String array like this,
String[] costumer = new String[10];Now customer has 10 elements (room for 10 strings) and you can do for example this,
int z = 0;
costumer[z] = "string1" + "string2";This means the two strings are added and assigned to element 0 of the array.
If you can't take it from here you need to step back for a while and carefully study a beginners textbook on Java.

Get numerical values from 2D array of string

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