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JCombobox changes another JCombobox

I am trying to combine 2 jcomboboxes. 1 combobox is intended for displaying a category of expenses. and the second combobox is reading a file from a text file to display product types. If I changed the first combobox, I would like the second combobox to change depending on which user selects the first.

Is it possible that I can load another command with a list of text files? These subelements will not be arrays, but the same as before, as they are at the bottom of the code for cboperson.

edited code:

private JComboBox cboCategory;
private JComboBox cboPerson;
private JComboBox cboItem;
public String itemChange = "groceries.txt";

public ExpenditureTracker() {......


    String[] items = {"Select Item", "Groceries", "Bills", "Travelling", "Leasure", "Other"};
    mainComboBox = new JComboBox(items);
    mainComboBox.addActionListener(this);
    mainComboBox.addItemListener(this);
    //prevent action events from being fired when the up/down arrow keys are used
    //mainComboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
    mainComboBox.setBounds(113, 138, 85, 20);
    importPanel.add(mainComboBox);


    subComboBox = new JComboBox();//  Create sub combo box with multiple models
    subComboBox.setPrototypeDisplayValue("XXXXXXXXXX"); // JDK1.4
    subComboBox.addItemListener(this);
    subComboBox.setBounds(113, 188, 85, 20);
    importPanel.add(subComboBox);


    String[] subItems1 = {"Select Color", "Red", "Blue", "Green"};
    subItems.put(items[1], subItems1);
    String[] subItems2 = {"Select Shape", "Circle", "Square", "Triangle"};
    subItems.put(items[2], subItems2);
    String[] subItems3 = {"Select Fruit", "Apple", "Orange", "Banana"};
    subItems.put(items[3], subItems3);
    String[] subItems4 = {"Select Fruit", "Apple", "Orange", "Banana"};
    subItems.put(items[4], subItems3);
    String[] subItems5 = {"Select Fruit", "Apple", "Orange", "Banana"};
    subItems.put(items[5], subItems3);


    loadDataTocboPerson();
}




private void loadDataToCboPerson() {
    Scanner fileReader = new Scanner(getClass().getResourceAsStream(
            itemChange));
    try {
        DefaultComboBoxModel model = new DefaultComboBoxModel();
        while (fileReader.hasNextLine()) {
            model.addElement(fileReader.nextLine());
        }
        cboItem.setModel(model);
    } finally {
        fileReader.close();
    }
}
+3
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3 answers

eg

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class ComboBoxTwo extends JFrame implements ActionListener, ItemListener {

    private static final long serialVersionUID = 1L;
    private JComboBox mainComboBox;
    private JComboBox subComboBox;
    private Hashtable<Object, Object> subItems = new Hashtable<Object, Object>();

    public ComboBoxTwo() {
        String[] items = {"Select Item", "Color", "Shape", "Fruit"};
        mainComboBox = new JComboBox(items);
        mainComboBox.addActionListener(this);
        mainComboBox.addItemListener(this);
        //prevent action events from being fired when the up/down arrow keys are used
        //mainComboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
        getContentPane().add(mainComboBox, BorderLayout.WEST);
        subComboBox = new JComboBox();//  Create sub combo box with multiple models
        subComboBox.setPrototypeDisplayValue("XXXXXXXXXX"); // JDK1.4
        subComboBox.addItemListener(this);
        getContentPane().add(subComboBox, BorderLayout.EAST);
        String[] subItems1 = {"Select Color", "Red", "Blue", "Green"};
        subItems.put(items[1], subItems1);
        String[] subItems2 = {"Select Shape", "Circle", "Square", "Triangle"};
        subItems.put(items[2], subItems2);
        String[] subItems3 = {"Select Fruit", "Apple", "Orange", "Banana"};
        subItems.put(items[3], subItems3);
//      mainComboBox.setSelectedIndex(1);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String item = (String) mainComboBox.getSelectedItem();
        Object o = subItems.get(item);
        if (o == null) {
            subComboBox.setModel(new DefaultComboBoxModel());
        } else {
            subComboBox.setModel(new DefaultComboBoxModel((String[]) o));
        }
    }

    @Override
    public void itemStateChanged(ItemEvent e) {
        if (e.getStateChange() == ItemEvent.SELECTED) {
            if (e.getSource() == mainComboBox) {
                if (mainComboBox.getSelectedIndex() != 0) {
                    FirstDialog firstDialog = new FirstDialog(ComboBoxTwo.this,
                            mainComboBox.getSelectedItem().toString(), "Please wait,  Searching for ..... ");
                }
            } 
        }
    }

    private class FirstDialog extends JDialog {

        private static final long serialVersionUID = 1L;

        FirstDialog(final Frame parent, String winTitle, String msgString) {
            super(parent, winTitle);
            setModalityType(Dialog.ModalityType.APPLICATION_MODAL);
            JLabel myLabel = new JLabel(msgString);
            JButton bNext = new JButton("Stop Processes");
            add(myLabel, BorderLayout.CENTER);
            add(bNext, BorderLayout.SOUTH);
            bNext.addActionListener(new ActionListener() {

                @Override
                public void actionPerformed(ActionEvent evt) {
                    setVisible(false);
                }
            });
            javax.swing.Timer t = new javax.swing.Timer(1000, new ActionListener() {

                @Override
                public void actionPerformed(ActionEvent e) {
                    setVisible(false);
                }
            });
            t.setRepeats(false);
            t.start();
            setLocationRelativeTo(parent);
            setSize(new Dimension(400, 100));
            setVisible(true);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new ComboBoxTwo();
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}
+4
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-, ==, equals equalsIgnoreCase. .

:

if (item == "Groceries") {

:

if ("Groceries".equalsIgnoreCase(item.toString())) {

toString() , , String String. , null, - .

+1
 if(jComboBox1.getSelectedItem() == "First Choice"){
   jComboBox2.removeAllItems();
   jComboBox2.addItem("First Choice Item 1");
 }
 if(jComboBox1.getSelectedItem() == "Another Choice"){
   jComboBox2.removeAllItems();
   jComboBox2.addItem("Another Choice Item 1");
 }

or you can include elements in an array if there are too many of them.

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