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Nov 10th, 2008

Combo Box Question...

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I wrote the code for the following 2 combo boxes which display a drop-down list of dorm buildings and meal plans for a college student. The code works, and both boxes are displayed. I have completed what I have to do, but want to find a way to get the total of both categories, and display that value. I am confused as to how to display that value when the array that holds the information is a String.... Is there a way to assign a value to each array item? Here is what I have....

(Toggle Plain Text)

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Main extends JFrame
{
    private JPanel dormPanel;
    private JPanel selectedDormPanel;
    private JComboBox dormBox;
    private JLabel dormLabel;
    private JTextField selectedDorm;
    
    private JPanel mealPanel;
    private JPanel selectedMealPanel;
    private JComboBox mealBox;
    private JLabel mealLabel;
    private JTextField selectedMeal;
    
    
    
    private String[] dorm = { "Allen Hall: $1500/semester", "Pike Hall: $1600/semester", "Farthing Hall: $1200/semester", "University Suites: $1800/semester"};
   private String[] meal = {"7 meals per week: $560/ semester", "14 meals per week: $1,095/ semester", "Unlimited meals: $1,500/ semester"};


public Main()
{
    super("Selection");
        
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        setLayout(new BorderLayout());
        
        buildDormPanel();
        buildSelectedDormPanel();
        buildMealPanel();
        buildSelectedMealPanel();

        add(dormPanel, BorderLayout.CENTER);
        add(selectedDormPanel, BorderLayout.SOUTH);
        add(mealPanel, BorderLayout.CENTER);
        add(selectedMealPanel, BorderLayout.SOUTH);
        pack();
        setVisible(true);
}

 private void buildDormPanel()
    {
        dormPanel = new JPanel();
        dormBox = new JComboBox(dorm);
        dormBox.addActionListener(new DormListener());
        dormPanel.add(dormBox);
        
        
    }
 
 private void buildMealPanel()
    {
        mealPanel = new JPanel();
        mealBox = new JComboBox(meal);
        mealBox.addActionListener(new MealListener());
        mealPanel.add(mealBox);
        
        
    }
   
   
    
    private void buildSelectedDormPanel()
    {
        selectedDormPanel = new JPanel();
        
        dormLabel = new JLabel("Dorm: ");
        selectedDorm = new JTextField (25);
        selectedDorm.setEditable(false);
        
        selectedDormPanel.add(dormLabel);
        selectedDormPanel.add(selectedDorm);
       
    }
    
   
    private void buildSelectedMealPanel()
    {
        selectedMealPanel = new JPanel();
        
        mealLabel = new JLabel("Meal: ");
        selectedMeal = new JTextField (25);
        selectedMeal.setEditable(false);
        
        selectedMealPanel.add(mealLabel);
        selectedMealPanel.add(selectedMeal);
       
    }
    
    
    
    private class DormListener implements ActionListener
    {

        public void actionPerformed(ActionEvent e) 
        {
            String selection = (String) dormBox.getSelectedItem();
            selectedDorm.setText(selection);
        }
    }
    private class MealListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            String selection = (String) mealBox.getSelectedItem();
            selectedMeal.setText(selection);
        }
    }
    

        
    
    public static void main(String[] args)
    {
        new Dorm();
        new Meal();
    }
}

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Main extends JFrame
{
    private JPanel dormPanel;
    private JPanel selectedDormPanel;
    private JComboBox dormBox;
    private JLabel dormLabel;
    private JTextField selectedDorm;
    
    private JPanel mealPanel;
    private JPanel selectedMealPanel;
    private JComboBox mealBox;
    private JLabel mealLabel;
    private JTextField selectedMeal;
    
    
    
    private String[] dorm = { "Allen Hall: $1500/semester", "Pike Hall: $1600/semester", "Farthing Hall: $1200/semester", "University Suites: $1800/semester"};
   private String[] meal = {"7 meals per week: $560/ semester", "14 meals per week: $1,095/ semester", "Unlimited meals: $1,500/ semester"};


public Main()
{
    super("Selection");
        
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        setLayout(new BorderLayout());
        
        buildDormPanel();
        buildSelectedDormPanel();
        buildMealPanel();
        buildSelectedMealPanel();

        add(dormPanel, BorderLayout.CENTER);
        add(selectedDormPanel, BorderLayout.SOUTH);
        add(mealPanel, BorderLayout.CENTER);
        add(selectedMealPanel, BorderLayout.SOUTH);
        pack();
        setVisible(true);
}

 private void buildDormPanel()
    {
        dormPanel = new JPanel();
        dormBox = new JComboBox(dorm);
        dormBox.addActionListener(new DormListener());
        dormPanel.add(dormBox);
        
        
    }
 
 private void buildMealPanel()
    {
        mealPanel = new JPanel();
        mealBox = new JComboBox(meal);
        mealBox.addActionListener(new MealListener());
        mealPanel.add(mealBox);
        
        
    }
   
   
    
    private void buildSelectedDormPanel()
    {
        selectedDormPanel = new JPanel();
        
        dormLabel = new JLabel("Dorm: ");
        selectedDorm = new JTextField (25);
        selectedDorm.setEditable(false);
        
        selectedDormPanel.add(dormLabel);
        selectedDormPanel.add(selectedDorm);
       
    }
    
   
    private void buildSelectedMealPanel()
    {
        selectedMealPanel = new JPanel();
        
        mealLabel = new JLabel("Meal: ");
        selectedMeal = new JTextField (25);
        selectedMeal.setEditable(false);
        
        selectedMealPanel.add(mealLabel);
        selectedMealPanel.add(selectedMeal);
       
    }
    
    
    
    private class DormListener implements ActionListener
    {

        public void actionPerformed(ActionEvent e) 
        {
            String selection = (String) dormBox.getSelectedItem();
            selectedDorm.setText(selection);
        }
    }
    private class MealListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            String selection = (String) mealBox.getSelectedItem();
            selectedMeal.setText(selection);
        }
    }
    

        
    
    public static void main(String[] args)
    {
        new Dorm();
        new Meal();
    }
}

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cproud21

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Nov 10th, 2008

Re: Combo Box Question...

Yes, that's what objects are for and you can place any object type you want into a combo box. The toString() value of the object will be displayed as the text if the object is not itself a String. So consider how a small class like this could be used

java Syntax (Toggle Plain Text)
class DormPlan {
 
    private String name;
    private int cost;
 
    public DormPlan(String name, int cost) {
        this.name = name;
        this.cost = cost;
    }
 
    @Override
    public String toString() {
        return name + ": $" + cost + "/semester";
    }
 
    public int getCost(){
        return cost;
    }
}
class DormPlan {

    private String name;
    private int cost;

    public DormPlan(String name, int cost) {
        this.name = name;
        this.cost = cost;
    }

    @Override
    public String toString() {
        return name + ": $" + cost + "/semester";
    }

    public int getCost(){
        return cost;
    }
}

(Edit: Example class intentionally left a little bit incomplete.)

Last edited by Ezzaral; Nov 10th, 2008 at 4:48 pm.

Ezzaral

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Nov 10th, 2008

-1

Re: Combo Box Question...

@cproud21 why do you have always create new post just continue with same question? Same topic you started here

peter_budo

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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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