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import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeSet;
import javax.swing.AbstractListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListModel;
class SortedListModel extends AbstractListModel {
SortedSet<Object> model;
public SortedListModel() {
model = new TreeSet<Object>();
}
public int getSize() {
return model.size();
}
public Object getElementAt(int index) {
return model.toArray()[index];
}
public void add(Object element) {
if (model.add(element)) {
fireContentsChanged(this, 0, getSize());
}
}
public void addAll(Object elements[]) {
Collection<Object> c = Arrays.asList(elements);
model.addAll(c);
fireContentsChanged(this, 0, getSize());
}
public void clear() {
model.clear();
fireContentsChanged(this, 0, getSize());
}
public boolean contains(Object element) {
return model.contains(element);
}
public Object firstElement() {
return model.first();
}
public Iterator iterator() {
return model.iterator();
}
public Object lastElement() {
return model.last();
}
public boolean removeElement(Object element) {
boolean removed = model.remove(element);
if (removed) {
fireContentsChanged(this, 0, getSize());
}
return removed;
}
}
public class DualListBox extends JPanel {
private JList sourceList;
private SortedListModel sourceListModel;
private JList destList;
private SortedListModel destListModel;
private JButton addButton;
private JButton removeButton;
public DualListBox() {
initScreen();
}
public void clearSourceListModel() {
sourceListModel.clear();
}
public void clearDestinationListModel() {
destListModel.clear();
}
public void addSourceElements(ListModel newValue) {
fillListModel(sourceListModel, newValue);
}
public void setSourceElements(ListModel newValue) {
clearSourceListModel();
addSourceElements(newValue);
}
public void addDestinationElements(ListModel newValue) {
fillListModel(destListModel, newValue);
}
private void fillListModel(SortedListModel model, ListModel newValues) {
int size = newValues.getSize();
for (int i = 0; i < size; i++) {
model.add(newValues.getElementAt(i));
}
}
public void addSourceElements(Object newValue[]) {
fillListModel(sourceListModel, newValue);
}
public void setSourceElements(Object newValue[]) {
clearSourceListModel();
addSourceElements(newValue);
}
public void addDestinationElements(Object newValue[]) {
fillListModel(destListModel, newValue);
}
private void fillListModel(SortedListModel model, Object newValues[]) {
model.addAll(newValues);
}
private void clearSourceSelected() {
Object selected[] = sourceList.getSelectedValues();
for (int i = selected.length - 1; i >= 0; --i) {
sourceListModel.removeElement(selected[i]);
}
sourceList.getSelectionModel().clearSelection();
}
private void clearDestinationSelected() {
Object selected[] = destList.getSelectedValues();
for (int i = selected.length - 1; i >= 0; --i) {
destListModel.removeElement(selected[i]);
}
destList.getSelectionModel().clearSelection();
}
private void initScreen() {
setLayout(new GridLayout(0, 2));
sourceListModel = new SortedListModel();
sourceList = new JList(sourceListModel);
addButton = new JButton(">>");
addButton.addActionListener(new AddListener());
removeButton = new JButton("<<");
removeButton.addActionListener(new RemoveListener());
destListModel = new SortedListModel();
destList = new JList(destListModel);
JPanel leftPanel = new JPanel(new BorderLayout());
leftPanel.add(new JLabel("Available Elements:"), BorderLayout.NORTH);
leftPanel.add(new JScrollPane(sourceList), BorderLayout.CENTER);
leftPanel.add(addButton, BorderLayout.SOUTH);
JPanel rightPanel = new JPanel(new BorderLayout());
rightPanel.add(new JLabel("Selected Elements:"), BorderLayout.NORTH);
rightPanel.add(new JScrollPane(destList), BorderLayout.CENTER);
rightPanel.add(removeButton, BorderLayout.SOUTH);
add(leftPanel);
add(rightPanel);
}
private class AddListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
Object selected[] = sourceList.getSelectedValues();
addDestinationElements(selected);
clearSourceSelected();
}
}
private class RemoveListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
Object selected[] = destList.getSelectedValues();
addSourceElements(selected);
clearDestinationSelected();
}
}
public static void main(String args[]) {
JFrame frame = new JFrame("Dual List Box Tester");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DualListBox dual = new DualListBox();
dual.addSourceElements(new String[] { "One", "Two", "Three" });
dual.addSourceElements(new String[] { "Four", "Five", "Six" });
dual.addSourceElements(new String[] { "Seven", "Eight", "Nine" });
dual.addSourceElements(new String[] { "Ten", "Eleven", "Twelve" });
dual.addSourceElements(new String[] { "Thirteen", "Fourteen", "Fifteen" });
dual.addSourceElements(new String[] { "Sixteen", "Seventeen", "Eighteen" });
dual.addSourceElements(new String[] { "Nineteen", "Twenty", "Thirty" });
frame.add(dual, BorderLayout.CENTER);
frame.setSize(400, 300);
frame.setVisible(true);
}
}
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