I'm new here, I need help about the codes in Java. And asking question here is my last option, and there you go. I already squeezed every last bit in my brain. I didn't get the output that I want. This code was posted here in stackoverflow. And this code was just the same thing that I want to create.
I just want to get the value of the 2nd JComboBox.
For example:
I clicked "Shape" in first ComboBox. Then I choose "Triangle". Then the last part was I'll put some or it will show the description about that "Triangle". Like "Triangle has three sides." something like that.
Another example
I chose "Color" in the first ComboBox. Then I clicked the "Red". Then I want to show the description of the color "Red" on the last part of the output.
Example of the output after choosing in JComboBox is:
"Shape: Triangle
Triangle has three sides."
I hope it makes sense.
Here's the sample code..
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);
getContentPane().add(mainComboBox, BorderLayout.WEST);
subComboBox = new JComboBox();
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);
}
@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);
}
} ///////
This works
package test1;
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<String> mainComboBox;
private JComboBox<String> subComboBox;
private JLabel label;
private String[][] descriptions;
private Hashtable<Object, Object> subItems = new Hashtable<Object, Object> ();
public ComboBoxTwo() {
String[] items = {"Select Item", "Color", "Shape", "Fruit"};
this.getContentPane().setLayout(null);
this.setSize(400, 400);
mainComboBox = new JComboBox<String>(items);
mainComboBox.addActionListener(this);
mainComboBox.addItemListener(this);
mainComboBox.setSize(100, 100);
mainComboBox.setLocation(0, 100);
subComboBox = new JComboBox<String>();
subComboBox.setPrototypeDisplayValue("XXXXXXXXXX"); // JDK1.4
subComboBox.addItemListener(this);
subComboBox.setSize(100, 100);
subComboBox.setLocation(this.getSize().width - 120, 100);
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);
label = new JLabel();
label.setSize(300, 25);
label.setLocation(this.getSize().width /2 - label.getSize().width /2, 25);
label.setText("This is a label: currently nothing selected");
label.setVisible(true);
getContentPane().add(subComboBox);
getContentPane().add(mainComboBox);
getContentPane().add(label);
descriptions = new String[][]
{
{"The red color", "The blue color", "A green color"},
{"This shape is round", "Looks rectangular", "Has three sides"},
{"Didn't fall far from the tree", "Seems quite orangy", "Look i've got a banana in my trousers"}
};
}
@Override
public void actionPerformed(ActionEvent e) {
String item = (String) mainComboBox.getSelectedItem();
Object o = subItems.get(item);
if (o == null) {
subComboBox.setModel(new DefaultComboBoxModel<String>());
} else {
subComboBox.setModel(new DefaultComboBoxModel<String>((String[]) o));
}
}
@SuppressWarnings("unchecked")
@Override
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
if (mainComboBox.getSelectedIndex() == 0 && subComboBox.getSelectedIndex() == 0)
{
label.setText("This is a label: currently nothing selected");
}
else if (mainComboBox.getSelectedIndex() >= 0)
{
label.setText("The first combobox has been altered");
}
if (e.getSource() == mainComboBox) {
if (mainComboBox.getSelectedIndex() != 0) {
FirstDialog firstDialog = new FirstDialog(ComboBoxTwo.this,
mainComboBox.getSelectedItem().toString(), "Please wait, Searching for ..... ");
}
}
else if (e.getSource() == subComboBox)
{
label.setText(descriptions[mainComboBox.getSelectedIndex() -1][((JComboBox<String>) e.getSource()).getSelectedIndex() -1]);
}
}
}
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.setLocationRelativeTo(null);
frame.setVisible(true);
}
}