2D Array Help

[Joe Namdt]

How do I select a column in the array? I can select the row just fine but for my ComboBox I need to select the column as the values for the combobox.

Thanks in advance.

import javax.swing.*;
 
import java.awt.*;
import java.awt.event.*;
 
 
 
public class PlainWrap extends JFrame implements ActionListener, ItemListener{
 
String[][] partNumberString =
{
{"PR214","MR43T", "RBL8","14K22"},
{"PR223","R43","RJ6 ","14K24"},
{"PR224","R43N ","RN4 ","14K30"},
{"PR246","R46N","RN8 ","14K32"}};
 

 

//All the GUI objects
JPanel mainPanel = new JPanel();
JPanel addPanel = new JPanel();
[I][B]JComboBox plainWrapComboBox = new JComboBox(partNumberString[???]);[/B][/I]        
        JTextField brandATextField = new JTextField(6);
JTextField brandCTextField = new JTextField(6);
JTextField brandXTextField = new JTextField(6);
JTextField newPlainWrapTextField = new JTextField(6);
JTextField newBrandATextField = new JTextField(6);
JTextField newBrandCTextField = new JTextField(6);
JTextField newBrandXTextField = new JTextField(6);
JButton addButton = new JButton("Add");
JButton okButton = new JButton("Ok");
JButton cancelButton = new JButton("Cancel");
JButton clearButton = new JButton("Clear");
JButton listButton = new JButton("List");
JTextArea outputTextArea = new JTextArea("Parts List", 20,50);
JScrollPane outputScrollPane = new JScrollPane(outputTextArea);

public static void main(String[] args) 
{
//create an object of the class and close button
PlainWrap partsStore = new PlainWrap();
partsStore.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}
 
public PlainWrap()
{
designFrame();
add(mainPanel);
setTitle("Plain Wrap Auto Parts");
setSize(900,400);
setVisible(true);
}

public void designFrame()
{
//add components to add panel
addPanel.add(new JLabel("Plain Wrap Part#"));
addPanel.add(newPlainWrapTextField);
addPanel.add(new JLabel("        Brand A Part#"));
addPanel.add(newBrandATextField);
addPanel.add(new JLabel("        Brand C Part#"));
addPanel.add(newBrandCTextField);
addPanel.add(new JLabel("        Brand X Part#"));
addPanel.add(newBrandXTextField);
addPanel.add(okButton);
addPanel.add(cancelButton);
addPanel.setVisible(false);

//add components to main panel
mainPanel.add(new JLabel("Plain Wrap Part#"));
mainPanel.add(plainWrapComboBox);
mainPanel.add(new JLabel("        Brand A Part#"));
mainPanel.add(brandATextField);
mainPanel.add(new JLabel("Brand C Part#"));
mainPanel.add(brandCTextField);
mainPanel.add(new JLabel("Brand X Part#"));
mainPanel.add(brandXTextField);
mainPanel.add(addButton);
mainPanel.add(clearButton);
mainPanel.add(addPanel);
mainPanel.add(outputScrollPane);
mainPanel.add(listButton);

//add listeners
plainWrapComboBox.addItemListener(this);
brandXTextField.addActionListener(this);
newBrandXTextField.addActionListener(this);
okButton.addActionListener(this);
cancelButton.addActionListener(this);
addButton.addActionListener(this);
clearButton.addActionListener(this);
listButton.addActionListener(this);
}

public void itemStateChanged(ItemEvent evt)
{
//listen for item state changes in ComboBox
int selection = plainWrapComboBox.getSelectedIndex();
brandATextField.setText(partNumberString[selection][1]);
brandCTextField.setText(partNumberString[selection][2]);
brandXTextField.setText(partNumberString[selection][3]);
 
}

public void actionPerformed(ActionEvent evt)
{
//determine action to perform once button is pushed
Object sourceObject = evt.getSource();
//if add button pushed add fields are visible
if(sourceObject == addButton)
{
displayFields();
}
//if clear button is pushed everything clears
if(sourceObject == clearButton)
{
clearAll();
}
//if list button is pushed all parts are listed
if(sourceObject == listButton)
{
list();
}
//if OK button is pushed new parts are added
if(sourceObject == okButton)
{
add();
}
//if cancel button is pushed fields are cleared and hidden
if(sourceObject == cancelButton)
{
clearAdd();
}
}

public void displayFields()
{
addPanel.setVisible(true);
}

public void clearAll()
{
addPanel.setVisible(false);
plainWrapComboBox.setSelectedIndex(0);
brandATextField.setText("");
brandCTextField.setText("");
brandXTextField.setText("");
newPlainWrapTextField.setText("");
newBrandATextField.setText("");
newBrandCTextField.setText("");
newBrandXTextField.setText("");
 
}
 
public void list()
{

}
 
public void add()
{


}
 

 
public void clearAdd()
{
newPlainWrapTextField.setText("");
newBrandATextField.setText("");
newBrandCTextField.setText("");
newBrandXTextField.setText("");
newPlainWrapTextField.requestFocus();
}
 
}
  

[ May 27, 2008: Message edited by: Joe Namdt ]
[ May 27, 2008: Message edited by: Joe Namdt ]

[Campbell Ritchie]

I am very sorry, but I moved your original post to another forum because it appeared to be more appropriate there.

The original seems to have vanished mysteriously, and I am sure I didn't send it to the wrong place. I am afraid I still think this is more of a specific Swing topic than a general beginner's topic, so I shall transfer this thread to Swing as well.

[Rob Spoor]

String[][] partNumberString = {
    {"PR214","MR43T", "RBL8","14K22"},
    {"PR223","R43","RJ6 ","14K24"},
    {"PR224","R43N ","RN4 ","14K30"},
    {"PR246","R46N","RN8 ","14K32"}};

Like you already know, getting rows is quite easy. There is no way to get a column directly though - partNumberString is not a matrix but an array, with each element being an array of Strings.

To get the second column (numbered 1), you need to create a new array:

String[] column = new String[partNumberString.length];
for (int i = 0; i < partNumberString.length; i++)
{
    column[i] = partNumberString[i][1];
}

You will need to make 100% sure that all arrays in partNumberString have the same length, or this code may fail. Fortunately, in your code that's ok.