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Thread: Adding another related combo box ?

  1. #1
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    Default Adding another related combo box ?

    Hi,

    I have a question. How can I add a third combo box to this program which will do the same thing the second combo box does with the first. I mean I know how to add the combo box but I want the third combo box to depend on the action of the second combo box. As you can see the method that controls the action of the first and the second combo box operates by if/else, and if I did the same thing for the third combo box, then it would be a mile long code?

    So please help me think of another way of making this method, or post an example similar to this but with more combo boxes. Thank you.


    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
    public class Compare extends JFrame implements ItemListener {
            JComboBox combo, lcombo;
     
            public Compare() {
                    setLayout(null);
                    String a[] = { "Select", "Watches", "Mobiles", "shoes" };
                    combo = new JComboBox(a);
                    combo.setBounds(50, 50, 100, 20);
                    combo.addItemListener(this);
                    add(combo);
     
                    lcombo = new JComboBox();
                    lcombo.addItemListener(this);
                    lcombo.setEnabled(false);
                    add(lcombo);
                    lcombo.setBounds(50, 100, 100, 20);
     
                    setSize(300, 300);
            }
     
            public void itemStateChanged(ItemEvent e) {
                    String b[] = { "Titan", "HMT" };
                    String c[] = { "Nokia", "Sony", "Motorola", "Samsung" };
                    String d[] = { "Liberty", "Action", "Bata", "Campus", "Relaxo" };
     
                    if (e.getSource() == combo) {
                            if (combo.getSelectedItem().equals("Select")) {
                                    lcombo.setEnabled(false);
                            } else if (combo.getSelectedItem().equals("Watches")) {
                                    lcombo.setEnabled(true);
                                    lcombo.removeAllItems();
                                    for (int i = 0; i < b.length; i++) {
                                            lcombo.addItem(b[i]);
                                    }
                            } else if (combo.getSelectedItem().equals("Mobiles")) {
                                    lcombo.setEnabled(true);
                                    lcombo.removeAllItems();
                                    for (int i = 0; i < c.length; i++) {
                                            lcombo.removeItem(c[i]);
                                            lcombo.addItem(c[i]);
                                    }
                            } else if (combo.getSelectedItem().equals("shoes")) {
                                    lcombo.setEnabled(true);
                                    lcombo.removeAllItems();
                                    for (int i = 0; i < d.length; i++) {
                                            lcombo.addItem(d[i]);
                                    }
                            }
                    }
            }
     
            public static void main(String args[]) {
                    (new Compare()).setVisible(true);
            }


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Adding another related combo box ?

    You could use a series of Maps instead of a series of arrays.
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