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From: Roberto Sagoleo <roberto.sagoleo@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: JComboBox with IDentifiers
Date: Fri, 10 Aug 2012 14:41:33 -0700 (PDT)
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Hi Guys,
 here I am again with another amazing trouble!   08-)

I need to create a JComboBox containing a list of Items, each of which has its own IDentifier!

So: when I select an Item of the JComboBox, I need to get its IDentifier (ie: its ID in a DataBase Table).

I wrote the following four classes example, and I hope this could help someone else with my same needs!

Check it out at: http://www.jesax.net/?demo/java/jcombobox-identifier

Please, let me know if and how it can be useful!

Best Regards,
 Roberto Sagoleo.
  [2012/07/19] 08-)





///////////////////////////////////////////////////////////////////
//
// JESAX.NET [ http://www.jesax.net/ ] 
//  
// JAVA/script Environmental Subroutines for Accessible XML 
//  
// BoF :: "JSX_JAVA_Main.java"
// 
// (C) CopyRight JESAX.net / SagoSoft.it [1984 - 2012] 
// 
// Last update: 2012/07/19 - 12:34 
//
///////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////
//
// Class.
//
public class JSX_JAVA_Main 
	{

	public static void main(String[] args) 
		{
		System.out.println( "JSX:: JAVA 'JComboBox-IDentifier' starting..." );
		JSX_JAVA_JFrame_IDentifier l_jsx_jframe_identifier;
		l_jsx_jframe_identifier = new JSX_JAVA_JFrame_IDentifier( "JSX.JAVA     >>>>> JComboBox-IDentifier <<<<<" );
		l_jsx_jframe_identifier.setVisible(true);
		}//main

	}//class
///////////////////////////////////////////////////////////////////
	
///////////////////////////////////////////////////////////////////
// EoF :: "JSX_JAVA_Main.java"
///////////////////////////////////////////////////////////////////





///////////////////////////////////////////////////////////////////
//
// JESAX.NET [ http://www.jesax.net/ ] 
//  
// JAVA/script Environmental Subroutines for Accessible XML 
//  
// BoF :: "JSX_JAVA_JFRame_IDentifier.java"
// 
// (C) CopyRight JESAX.net / SagoSoft.it [1984 - 2012] 
// 
// Last update: 2012/07/19 - 12:34 
//
///////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////
//
// Imports.
//
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.SwingConstants;

///////////////////////////////////////////////////////////////////
//
// Class.
//
public class JSX_JAVA_JFrame_IDentifier extends JFrame
	{
	private static final long              serialVersionUID = 1L;
	private JSX_JAVA_JComboBox_IDentifier  m_jcombobox_identifier ;
	private JButton                        m_jbutton_continue     ;
	private JLabel                         m_jlabel_identifier    ;
	private JLabel                         m_jlabel_index         ;
	private JPanel                         m_jpanel_identifier    ;
	private JSeparator                     m_jseparator_v01       ;
	private JSeparator                     m_jseparator_v02       ;
	private JSeparator                     m_jseparator_v03       ;

	public JSX_JAVA_JFrame_IDentifier( String p_title )
		{

		// Inits.
		super( p_title );
		this.setLocationRelativeTo(null);
		this.setSize(new Dimension(500,300));
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Custom data.
		Object[] itemData_0 = new Object[] { 0, "Please select an Item..."                                            , "zero" };
		Object[] itemData_1 = new Object[] { 1, "The first Item has an IDentifier with Value 1"                       , "1st"  };
		Object[] itemData_2 = new Object[] { 2, "The second Item has an IDentifier like its Position"                 , "2nd"  };
		Object[] itemData_3 = new Object[] { 5, "The third Item switches its IDentifier with the 5th Item"            , "3rd"  };
		Object[] itemData_4 = new Object[] { 4, "The fourth Item has has an IDentifier corresponding to its Position" , "4th"  };
		Object[] itemData_5 = new Object[] { 3, "The fifth Item switches its IDentifier with the 3rd Item"            , "5th"  };

		// Graphics.		
		m_jpanel_identifier = new JPanel();

		// Separators.
		m_jseparator_v01 = new JSeparator( SwingConstants.VERTICAL   ); 
		m_jseparator_v02 = new JSeparator( SwingConstants.VERTICAL   ); 
		m_jseparator_v03 = new JSeparator( SwingConstants.VERTICAL   ); 
		m_jseparator_v01.setSize(500, 10);
		m_jseparator_v02.setSize(500, 10);
		m_jseparator_v03.setSize(500, 10);
		m_jseparator_v01.setPreferredSize(new Dimension(500,10));
		m_jseparator_v02.setPreferredSize(new Dimension(500,10));
		m_jseparator_v03.setPreferredSize(new Dimension(500,10));
		
		// Combos.
		m_jcombobox_identifier = new JSX_JAVA_JComboBox_IDentifier();
		m_jcombobox_identifier.setSize(400, 50);
		m_jcombobox_identifier.setPreferredSize(new Dimension(400,50));
		
		// Custom data.
		m_jcombobox_identifier.addItem( itemData_0 );
		m_jcombobox_identifier.addItem( itemData_1 );
		m_jcombobox_identifier.addItem( itemData_2 );
		m_jcombobox_identifier.addItem( itemData_3 ); 
		m_jcombobox_identifier.addItem( itemData_4 );
		m_jcombobox_identifier.addItem( itemData_5 );
		m_jcombobox_identifier.setSize(400, 50);
		m_jcombobox_identifier.setPreferredSize(new Dimension(400,50));

		// Buttons.
		m_jbutton_continue  = new JButton( "Update..." );
		m_jbutton_continue.setSize(400, 50);
		m_jbutton_continue.setPreferredSize(new Dimension(400,50));
		m_jbutton_continue.setSize( new Dimension(400,50));
		m_jbutton_continue.setAlignmentX(Component.CENTER_ALIGNMENT);

		// Labels.
		m_jlabel_index      = new JLabel( "Index: N/A"      );
		m_jlabel_identifier = new JLabel( "Identifier: N/A" );
		m_jlabel_index.setHorizontalTextPosition(JLabel.LEFT);
		m_jlabel_identifier.setHorizontalTextPosition(JLabel.LEFT);
		m_jlabel_index.setVerticalTextPosition(JLabel.TOP);
		m_jlabel_identifier.setVerticalTextPosition(JLabel.TOP);
		m_jlabel_index.setAlignmentX(Component.LEFT_ALIGNMENT);
		m_jlabel_identifier.setAlignmentX(Component.LEFT_ALIGNMENT);

		// Rendering.
		this.add( m_jpanel_identifier );
		m_jpanel_identifier.add( m_jcombobox_identifier );
		m_jpanel_identifier.add( m_jseparator_v01       );
		m_jpanel_identifier.add( m_jbutton_continue     );
		m_jpanel_identifier.add( m_jseparator_v02       );
		m_jpanel_identifier.add( m_jlabel_index         );
		m_jpanel_identifier.add( m_jseparator_v03       );
		m_jpanel_identifier.add( m_jlabel_identifier    );
			
		// Listeners.
		ActionListener actionlistener_continue = new ActionListener() 
			{
			@Override public void actionPerformed(ActionEvent ev) 
				{
				UpdateIndexAndIdentifier( );
				}//actionPerformed
			};//actionlistener_continue
		m_jbutton_continue.addActionListener(actionlistener_continue);
		
		}//constructor

	private void UpdateIndexAndIdentifier( )
		{
		Integer  l_selectedIndex      ;
		Integer  l_selectedIDentifier ;
		String   l_index_str          ;
		String   l_identifier_str     ;
				
		// Index.	
		l_selectedIndex = m_jcombobox_identifier.getSelectedIndex();

		// IDentifier.
		l_selectedIDentifier = m_jcombobox_identifier.getIdentifierAt( l_selectedIndex );

		// Labels.
		l_index_str      = String.valueOf( l_selectedIndex      );
		l_identifier_str = String.valueOf( l_selectedIDentifier );
		m_jlabel_index.setText( "Index= " + l_index_str );
		m_jlabel_identifier.setText( "IDentifier= " + l_identifier_str );
		
		}//UpdateIndexAndIdentifier

	}//class
///////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////
// EoF :: "JSX_JAVA_JFRame_IDentifier.java"
///////////////////////////////////////////////////////////////////





///////////////////////////////////////////////////////////////////
//
// JESAX.NET [ http://www.jesax.net/ ] 
//  
// JAVA/script Environmental Subroutines for Accessible XML 
//  
// BoF :: "JSX_JAVA_JComboBox_IDentifier.java"
// 
// (C) CopyRight JESAX.net / SagoSoft.it [1984 - 2012] 
// 
// Last update: 2012/07/19 - 12:34 
//
///////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////
//
// Imports.
//
import java.util.ArrayList;
import javax.swing.JComboBox;
import java.awt.List;
import javax.swing.*; 
import java.awt.*;
import java.awt.List;
import java.awt.event.*;
import java.lang.Object;
import java.util.*;

///////////////////////////////////////////////////////////////////
//
// Class.
//
public class JSX_JAVA_JComboBox_IDentifier extends JComboBox
	{

	ArrayList<JSX_JAVA_NamVal> m_namval_list;

	public JSX_JAVA_JComboBox_IDentifier()
		{	
		super( );

		m_namval_list = new ArrayList<JSX_JAVA_NamVal>();
		}//constructor
		
	public void addItem( Object[] p_obj )
		{ 
		String   l_jsx_nam; 
		int      l_jsx_val; 
		
		// Data.
		l_jsx_val = (Integer) p_obj[0];
		l_jsx_nam = (String)  p_obj[1];
		
		// Super.
		super.addItem( (Object)l_jsx_nam );

		JSX_JAVA_NamVal l_namval_obj;
		l_namval_obj = new JSX_JAVA_NamVal();
		l_namval_obj._SetNam( l_jsx_nam );
		l_namval_obj._SetVal( l_jsx_val );
		m_namval_list.add( l_namval_obj );

		}//addItem

	public int getIdentifierAt( int p_iIndex )
		{
		JSX_JAVA_NamVal l_namval_obj;
		int      l_val;
		
		// IDentifier.
		l_namval_obj = this.m_namval_list.get( p_iIndex );
		l_val = l_namval_obj._GetVal();

		// Return value.
		return( l_val );

		}//getIdentifierAt

	}//class
///////////////////////////////////////////////////////////////////
	
///////////////////////////////////////////////////////////////////
// EoF :: "JSX_JAVA_JComboBox_IDentifier.java"
///////////////////////////////////////////////////////////////////





///////////////////////////////////////////////////////////////////
//
// JESAX.NET [ http://www.jesax.net/ ] 
//  
// JAVA/script Environmental Subroutines for Accessible XML 
//  
// BoF :: "JSX_JAVA_NamVal.java"
// 
// (C) CopyRight JESAX.net / SagoSoft.it [1984 - 2012] 
// 
// Last update: 2012/07/19 - 12:34 
//
///////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////
//
// Imports.
//
import java.lang.Object;
import java.util.*;

///////////////////////////////////////////////////////////////////
//
// Class.
//
public class JSX_JAVA_NamVal 
	{

	int      m_jsx_java_val;
	String   m_jsx_java_nam;

	public JSX_JAVA_NamVal()
		{	
		this.m_jsx_java_val = 0;
		this.m_jsx_java_nam = "";
		}//constructor
		
	public void _SetVal( int p_val )
		{
		int l_val;
		l_val = p_val;
		this.m_jsx_java_val = l_val;
		}//_SetVal
	public int _GetVal( )
		{
		int l_val;
		l_val = this.m_jsx_java_val;
		return( l_val );
	}//_GetVal
	
	public void _SetNam( String p_nam )
		{
		String l_nam;
		l_nam = p_nam;
		this.m_jsx_java_nam = l_nam;
		}//_SetNam
	public String _GetNam( )
		{
		String l_nam;
		l_nam = this.m_jsx_java_nam;
		return( l_nam );
	}//_GetNam
 
	@Override public String toString()
		{
		String l_nam;
		l_nam = super.toString();
		l_nam = this._GetNam();
		return( l_nam );
		}//toString

	}//class
///////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////
// EoF :: "JSX_JAVA_NamVal.java"
///////////////////////////////////////////////////////////////////