Java by API/javax.swing/DefaultListModel
Содержание
- 1 DefaultListModel: addElement(Object obj)
- 2 DefaultListModel: add(int index, Object element)
- 3 DefaultListModel: clear()
- 4 DefaultListModel: ensureCapacity(int count)
- 5 DefaultListModel: getSize()
- 6 DefaultListModel: insertElementAt(Object obj, int index)
- 7 DefaultListModel: removeAllElements()
- 8 DefaultListModel: removeElementAt(int index)
- 9 DefaultListModel: remove(int index)
- 10 DefaultListModel: removeRange(int fromIndex, int toIndex)
- 11 DefaultListModel: setElementAt(Object obj, int index)
- 12 DefaultListModel: set(int index, Object element)
DefaultListModel: addElement(Object obj)
<source lang="java">
import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; public class MainClass {
public static void main(final String args[]) {
String labels[] = { "A", "B", "C", "D", "E" };
JFrame frame = new JFrame("Sizing Samples");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DefaultListModel model = new DefaultListModel();
model.ensureCapacity(1000);
for (int i = 0; i < 100; i++) {
for (int j = 0; j < 5; j++) {
model.addElement(labels[j]);
}
}
JList jlist2 = new JList(model);
jlist2.setVisibleRowCount(4);
jlist2.setFixedCellHeight(12);
jlist2.setFixedCellWidth(200);
JScrollPane scrollPane2 = new JScrollPane(jlist2);
frame.add(scrollPane2, BorderLayout.CENTER);
frame.setSize(300, 350);
frame.setVisible(true);
}
}
</source>
DefaultListModel: add(int index, Object element)
<source lang="java">
/*Type: Interval Added , Index0: 0 , Index1: 0 [First, a, b, c, d] Type: Interval Added , Index0: 5 , Index1: 5 [First, a, b, c, d, Last] Type: Interval Added , Index0: 3 , Index1: 3 [First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 0 , Index1: 0 [New First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 6 , Index1: 6 [New First, a, b, Middle, c, d, New Last] Type: Interval Added , Index0: 7 , Index1: 7 [New First, a, b, Middle, c, d, New Last, a] Type: Interval Added , Index0: 8 , Index1: 8 [New First, a, b, Middle, c, d, New Last, a, b] Type: Interval Added , Index0: 9 , Index1: 9 [New First, a, b, Middle, c, d, New Last, a, b, c] Type: Interval Added , Index0: 10 , Index1: 10 [New First, a, b, Middle, c, d, New Last, a, b, c, d] Type: Interval Removed , Index0: 0 , Index1: 10 []
* */
import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; public class MainClass {
static String labels[] = { "a", "b", "c", "d" };
public static void main(String args[]) {
JFrame frame = new JFrame("Modifying Model");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final DefaultListModel model = new DefaultListModel();
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
JList jlist = new JList(model);
JScrollPane scrollPane1 = new JScrollPane(jlist);
frame.add(scrollPane1, BorderLayout.WEST);
ListDataListener listDataListener = new ListDataListener() {
public void contentsChanged(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalAdded(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalRemoved(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
private void appendEvent(ListDataEvent listDataEvent) {
switch (listDataEvent.getType()) {
case ListDataEvent.CONTENTS_CHANGED:
System.out.println("Type: Contents Changed");
break;
case ListDataEvent.INTERVAL_ADDED:
System.out.println("Type: Interval Added");
break;
case ListDataEvent.INTERVAL_REMOVED:
System.out.println("Type: Interval Removed");
break;
}
System.out.println(", Index0: " + listDataEvent.getIndex0());
System.out.println(", Index1: " + listDataEvent.getIndex1());
DefaultListModel theModel = (DefaultListModel) listDataEvent.getSource();
System.out.println(theModel);
}
};
model.addListDataListener(listDataListener);
model.add(0, "First");
model.addElement("Last");
int size = model.getSize();
model.insertElementAt("Middle", size / 2);
size = model.getSize();
if (size != 0)
model.set(0, "New First");
size = model.getSize();
if (size != 0)
model.setElementAt("New Last", size - 1);
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
model.clear();
size = model.getSize();
if (size != 0)
model.remove(0);
model.removeAllElements();
model.removeElement("Last");
size = model.getSize();
if (size != 0)
model.removeElementAt(size / 2);
size = model.getSize();
if (size != 0)
model.removeRange(0, size / 2);
frame.setSize(640, 300);
frame.setVisible(true);
}
}
</source>
DefaultListModel: clear()
<source lang="java">
import javax.swing.DefaultListModel; import javax.swing.JList; public class Main {
public static void main(String[] argv) throws Exception {
DefaultListModel model = new DefaultListModel();
JList list = new JList(model);
// Remove the first item
int pos = 0;
model.remove(pos);
// Remove the last item
pos = model.getSize() - 1;
if (pos >= 0) {
model.remove(pos);
}
// Remove all items
model.clear();
}
}
</source>
DefaultListModel: ensureCapacity(int count)
<source lang="java">
import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; public class MainClass {
public static void main(final String args[]) {
String labels[] = { "A", "B", "C", "D", "E" };
JFrame frame = new JFrame("Sizing Samples");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DefaultListModel model = new DefaultListModel();
model.ensureCapacity(1000);
for (int i = 0; i < 100; i++) {
for (int j = 0; j < 5; j++) {
model.addElement(labels[j]);
}
}
JList jlist2 = new JList(model);
jlist2.setVisibleRowCount(4);
jlist2.setFixedCellHeight(12);
jlist2.setFixedCellWidth(200);
JScrollPane scrollPane2 = new JScrollPane(jlist2);
frame.add(scrollPane2, BorderLayout.CENTER);
frame.setSize(300, 350);
frame.setVisible(true);
}
}
</source>
DefaultListModel: getSize()
<source lang="java">
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.DefaultListModel; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JScrollPane; public class MainClass extends JPanel {
JList list;
DefaultListModel model;
int counter = 15;
public MainClass() {
setLayout(new BorderLayout());
model = new DefaultListModel();
list = new JList(model);
JScrollPane pane = new JScrollPane(list);
JButton addButton = new JButton("Add Element");
JButton removeButton = new JButton("Remove Element");
for (int i = 0; i < 15; i++)
model.addElement("Element " + i);
addButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
model.addElement("Element " + counter);
counter++;
}
});
removeButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (model.getSize() > 0)
model.removeElementAt(0);
}
});
add(pane, BorderLayout.NORTH);
add(addButton, BorderLayout.WEST);
add(removeButton, BorderLayout.EAST);
}
public static void main(String s[]) {
JFrame frame = new JFrame("List Model Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new MainClass());
frame.setSize(260, 200);
frame.setVisible(true);
}
}
</source>
DefaultListModel: insertElementAt(Object obj, int index)
<source lang="java">
/*Type: Interval Added , Index0: 0 , Index1: 0 [First, a, b, c, d] Type: Interval Added , Index0: 5 , Index1: 5 [First, a, b, c, d, Last] Type: Interval Added , Index0: 3 , Index1: 3 [First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 0 , Index1: 0 [New First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 6 , Index1: 6 [New First, a, b, Middle, c, d, New Last] Type: Interval Added , Index0: 7 , Index1: 7 [New First, a, b, Middle, c, d, New Last, a] Type: Interval Added , Index0: 8 , Index1: 8 [New First, a, b, Middle, c, d, New Last, a, b] Type: Interval Added , Index0: 9 , Index1: 9 [New First, a, b, Middle, c, d, New Last, a, b, c] Type: Interval Added , Index0: 10 , Index1: 10 [New First, a, b, Middle, c, d, New Last, a, b, c, d] Type: Interval Removed , Index0: 0 , Index1: 10 []
* */
import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; public class MainClass {
static String labels[] = { "a", "b", "c", "d" };
public static void main(String args[]) {
JFrame frame = new JFrame("Modifying Model");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final DefaultListModel model = new DefaultListModel();
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
JList jlist = new JList(model);
JScrollPane scrollPane1 = new JScrollPane(jlist);
frame.add(scrollPane1, BorderLayout.WEST);
ListDataListener listDataListener = new ListDataListener() {
public void contentsChanged(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalAdded(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalRemoved(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
private void appendEvent(ListDataEvent listDataEvent) {
switch (listDataEvent.getType()) {
case ListDataEvent.CONTENTS_CHANGED:
System.out.println("Type: Contents Changed");
break;
case ListDataEvent.INTERVAL_ADDED:
System.out.println("Type: Interval Added");
break;
case ListDataEvent.INTERVAL_REMOVED:
System.out.println("Type: Interval Removed");
break;
}
System.out.println(", Index0: " + listDataEvent.getIndex0());
System.out.println(", Index1: " + listDataEvent.getIndex1());
DefaultListModel theModel = (DefaultListModel) listDataEvent.getSource();
System.out.println(theModel);
}
};
model.addListDataListener(listDataListener);
model.add(0, "First");
model.addElement("Last");
int size = model.getSize();
model.insertElementAt("Middle", size / 2);
size = model.getSize();
if (size != 0)
model.set(0, "New First");
size = model.getSize();
if (size != 0)
model.setElementAt("New Last", size - 1);
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
model.clear();
size = model.getSize();
if (size != 0)
model.remove(0);
model.removeAllElements();
model.removeElement("Last");
size = model.getSize();
if (size != 0)
model.removeElementAt(size / 2);
size = model.getSize();
if (size != 0)
model.removeRange(0, size / 2);
frame.setSize(640, 300);
frame.setVisible(true);
}
}
</source>
DefaultListModel: removeAllElements()
<source lang="java">
/*Type: Interval Added , Index0: 0 , Index1: 0 [First, a, b, c, d] Type: Interval Added , Index0: 5 , Index1: 5 [First, a, b, c, d, Last] Type: Interval Added , Index0: 3 , Index1: 3 [First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 0 , Index1: 0 [New First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 6 , Index1: 6 [New First, a, b, Middle, c, d, New Last] Type: Interval Added , Index0: 7 , Index1: 7 [New First, a, b, Middle, c, d, New Last, a] Type: Interval Added , Index0: 8 , Index1: 8 [New First, a, b, Middle, c, d, New Last, a, b] Type: Interval Added , Index0: 9 , Index1: 9 [New First, a, b, Middle, c, d, New Last, a, b, c] Type: Interval Added , Index0: 10 , Index1: 10 [New First, a, b, Middle, c, d, New Last, a, b, c, d] Type: Interval Removed , Index0: 0 , Index1: 10 []
* */
import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; public class MainClass {
static String labels[] = { "a", "b", "c", "d" };
public static void main(String args[]) {
JFrame frame = new JFrame("Modifying Model");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final DefaultListModel model = new DefaultListModel();
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
JList jlist = new JList(model);
JScrollPane scrollPane1 = new JScrollPane(jlist);
frame.add(scrollPane1, BorderLayout.WEST);
ListDataListener listDataListener = new ListDataListener() {
public void contentsChanged(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalAdded(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalRemoved(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
private void appendEvent(ListDataEvent listDataEvent) {
switch (listDataEvent.getType()) {
case ListDataEvent.CONTENTS_CHANGED:
System.out.println("Type: Contents Changed");
break;
case ListDataEvent.INTERVAL_ADDED:
System.out.println("Type: Interval Added");
break;
case ListDataEvent.INTERVAL_REMOVED:
System.out.println("Type: Interval Removed");
break;
}
System.out.println(", Index0: " + listDataEvent.getIndex0());
System.out.println(", Index1: " + listDataEvent.getIndex1());
DefaultListModel theModel = (DefaultListModel) listDataEvent.getSource();
System.out.println(theModel);
}
};
model.addListDataListener(listDataListener);
model.add(0, "First");
model.addElement("Last");
int size = model.getSize();
model.insertElementAt("Middle", size / 2);
size = model.getSize();
if (size != 0)
model.set(0, "New First");
size = model.getSize();
if (size != 0)
model.setElementAt("New Last", size - 1);
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
model.clear();
size = model.getSize();
if (size != 0)
model.remove(0);
model.removeAllElements();
model.removeElement("Last");
size = model.getSize();
if (size != 0)
model.removeElementAt(size / 2);
size = model.getSize();
if (size != 0)
model.removeRange(0, size / 2);
frame.setSize(640, 300);
frame.setVisible(true);
}
}
</source>
DefaultListModel: removeElementAt(int index)
<source lang="java">
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.DefaultListModel; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JScrollPane; public class MainClass extends JPanel {
JList list;
DefaultListModel model;
int counter = 15;
public MainClass() {
setLayout(new BorderLayout());
model = new DefaultListModel();
list = new JList(model);
JScrollPane pane = new JScrollPane(list);
JButton addButton = new JButton("Add Element");
JButton removeButton = new JButton("Remove Element");
for (int i = 0; i < 15; i++)
model.addElement("Element " + i);
addButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
model.addElement("Element " + counter);
counter++;
}
});
removeButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (model.getSize() > 0)
model.removeElementAt(0);
}
});
add(pane, BorderLayout.NORTH);
add(addButton, BorderLayout.WEST);
add(removeButton, BorderLayout.EAST);
}
public static void main(String s[]) {
JFrame frame = new JFrame("List Model Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new MainClass());
frame.setSize(260, 200);
frame.setVisible(true);
}
}
</source>
DefaultListModel: remove(int index)
<source lang="java">
/*Type: Interval Added , Index0: 0 , Index1: 0 [First, a, b, c, d] Type: Interval Added , Index0: 5 , Index1: 5 [First, a, b, c, d, Last] Type: Interval Added , Index0: 3 , Index1: 3 [First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 0 , Index1: 0 [New First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 6 , Index1: 6 [New First, a, b, Middle, c, d, New Last] Type: Interval Added , Index0: 7 , Index1: 7 [New First, a, b, Middle, c, d, New Last, a] Type: Interval Added , Index0: 8 , Index1: 8 [New First, a, b, Middle, c, d, New Last, a, b] Type: Interval Added , Index0: 9 , Index1: 9 [New First, a, b, Middle, c, d, New Last, a, b, c] Type: Interval Added , Index0: 10 , Index1: 10 [New First, a, b, Middle, c, d, New Last, a, b, c, d] Type: Interval Removed , Index0: 0 , Index1: 10 []
* */
import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; public class MainClass {
static String labels[] = { "a", "b", "c", "d" };
public static void main(String args[]) {
JFrame frame = new JFrame("Modifying Model");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final DefaultListModel model = new DefaultListModel();
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
JList jlist = new JList(model);
JScrollPane scrollPane1 = new JScrollPane(jlist);
frame.add(scrollPane1, BorderLayout.WEST);
ListDataListener listDataListener = new ListDataListener() {
public void contentsChanged(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalAdded(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalRemoved(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
private void appendEvent(ListDataEvent listDataEvent) {
switch (listDataEvent.getType()) {
case ListDataEvent.CONTENTS_CHANGED:
System.out.println("Type: Contents Changed");
break;
case ListDataEvent.INTERVAL_ADDED:
System.out.println("Type: Interval Added");
break;
case ListDataEvent.INTERVAL_REMOVED:
System.out.println("Type: Interval Removed");
break;
}
System.out.println(", Index0: " + listDataEvent.getIndex0());
System.out.println(", Index1: " + listDataEvent.getIndex1());
DefaultListModel theModel = (DefaultListModel) listDataEvent.getSource();
System.out.println(theModel);
}
};
model.addListDataListener(listDataListener);
model.add(0, "First");
model.addElement("Last");
int size = model.getSize();
model.insertElementAt("Middle", size / 2);
size = model.getSize();
if (size != 0)
model.set(0, "New First");
size = model.getSize();
if (size != 0)
model.setElementAt("New Last", size - 1);
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
model.clear();
size = model.getSize();
if (size != 0)
model.remove(0);
model.removeAllElements();
model.removeElement("Last");
size = model.getSize();
if (size != 0)
model.removeElementAt(size / 2);
size = model.getSize();
if (size != 0)
model.removeRange(0, size / 2);
frame.setSize(640, 300);
frame.setVisible(true);
}
}
</source>
DefaultListModel: removeRange(int fromIndex, int toIndex)
<source lang="java">
/*Type: Interval Added , Index0: 0 , Index1: 0 [First, a, b, c, d] Type: Interval Added , Index0: 5 , Index1: 5 [First, a, b, c, d, Last] Type: Interval Added , Index0: 3 , Index1: 3 [First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 0 , Index1: 0 [New First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 6 , Index1: 6 [New First, a, b, Middle, c, d, New Last] Type: Interval Added , Index0: 7 , Index1: 7 [New First, a, b, Middle, c, d, New Last, a] Type: Interval Added , Index0: 8 , Index1: 8 [New First, a, b, Middle, c, d, New Last, a, b] Type: Interval Added , Index0: 9 , Index1: 9 [New First, a, b, Middle, c, d, New Last, a, b, c] Type: Interval Added , Index0: 10 , Index1: 10 [New First, a, b, Middle, c, d, New Last, a, b, c, d] Type: Interval Removed , Index0: 0 , Index1: 10 []
* */
import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; public class MainClass {
static String labels[] = { "a", "b", "c", "d" };
public static void main(String args[]) {
JFrame frame = new JFrame("Modifying Model");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final DefaultListModel model = new DefaultListModel();
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
JList jlist = new JList(model);
JScrollPane scrollPane1 = new JScrollPane(jlist);
frame.add(scrollPane1, BorderLayout.WEST);
ListDataListener listDataListener = new ListDataListener() {
public void contentsChanged(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalAdded(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalRemoved(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
private void appendEvent(ListDataEvent listDataEvent) {
switch (listDataEvent.getType()) {
case ListDataEvent.CONTENTS_CHANGED:
System.out.println("Type: Contents Changed");
break;
case ListDataEvent.INTERVAL_ADDED:
System.out.println("Type: Interval Added");
break;
case ListDataEvent.INTERVAL_REMOVED:
System.out.println("Type: Interval Removed");
break;
}
System.out.println(", Index0: " + listDataEvent.getIndex0());
System.out.println(", Index1: " + listDataEvent.getIndex1());
DefaultListModel theModel = (DefaultListModel) listDataEvent.getSource();
System.out.println(theModel);
}
};
model.addListDataListener(listDataListener);
model.add(0, "First");
model.addElement("Last");
int size = model.getSize();
model.insertElementAt("Middle", size / 2);
size = model.getSize();
if (size != 0)
model.set(0, "New First");
size = model.getSize();
if (size != 0)
model.setElementAt("New Last", size - 1);
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
model.clear();
size = model.getSize();
if (size != 0)
model.remove(0);
model.removeAllElements();
model.removeElement("Last");
size = model.getSize();
if (size != 0)
model.removeElementAt(size / 2);
size = model.getSize();
if (size != 0)
model.removeRange(0, size / 2);
frame.setSize(640, 300);
frame.setVisible(true);
}
}
</source>
DefaultListModel: setElementAt(Object obj, int index)
<source lang="java">
/*Type: Interval Added , Index0: 0 , Index1: 0 [First, a, b, c, d] Type: Interval Added , Index0: 5 , Index1: 5 [First, a, b, c, d, Last] Type: Interval Added , Index0: 3 , Index1: 3 [First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 0 , Index1: 0 [New First, a, b, Middle, c, d, Last] Type: Contents Changed , Index0: 6 , Index1: 6 [New First, a, b, Middle, c, d, New Last] Type: Interval Added , Index0: 7 , Index1: 7 [New First, a, b, Middle, c, d, New Last, a] Type: Interval Added , Index0: 8 , Index1: 8 [New First, a, b, Middle, c, d, New Last, a, b] Type: Interval Added , Index0: 9 , Index1: 9 [New First, a, b, Middle, c, d, New Last, a, b, c] Type: Interval Added , Index0: 10 , Index1: 10 [New First, a, b, Middle, c, d, New Last, a, b, c, d] Type: Interval Removed , Index0: 0 , Index1: 10 []
* */
import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; public class MainClass {
static String labels[] = { "a", "b", "c", "d" };
public static void main(String args[]) {
JFrame frame = new JFrame("Modifying Model");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final DefaultListModel model = new DefaultListModel();
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
JList jlist = new JList(model);
JScrollPane scrollPane1 = new JScrollPane(jlist);
frame.add(scrollPane1, BorderLayout.WEST);
ListDataListener listDataListener = new ListDataListener() {
public void contentsChanged(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalAdded(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
public void intervalRemoved(ListDataEvent listDataEvent) {
appendEvent(listDataEvent);
}
private void appendEvent(ListDataEvent listDataEvent) {
switch (listDataEvent.getType()) {
case ListDataEvent.CONTENTS_CHANGED:
System.out.println("Type: Contents Changed");
break;
case ListDataEvent.INTERVAL_ADDED:
System.out.println("Type: Interval Added");
break;
case ListDataEvent.INTERVAL_REMOVED:
System.out.println("Type: Interval Removed");
break;
}
System.out.println(", Index0: " + listDataEvent.getIndex0());
System.out.println(", Index1: " + listDataEvent.getIndex1());
DefaultListModel theModel = (DefaultListModel) listDataEvent.getSource();
System.out.println(theModel);
}
};
model.addListDataListener(listDataListener);
model.add(0, "First");
model.addElement("Last");
int size = model.getSize();
model.insertElementAt("Middle", size / 2);
size = model.getSize();
if (size != 0)
model.set(0, "New First");
size = model.getSize();
if (size != 0)
model.setElementAt("New Last", size - 1);
for (int i = 0, n = labels.length; i < n; i++) {
model.addElement(labels[i]);
}
model.clear();
size = model.getSize();
if (size != 0)
model.remove(0);
model.removeAllElements();
model.removeElement("Last");
size = model.getSize();
if (size != 0)
model.removeElementAt(size / 2);
size = model.getSize();
if (size != 0)
model.removeRange(0, size / 2);
frame.setSize(640, 300);
frame.setVisible(true);
}
}
</source>
DefaultListModel: set(int index, Object element)
<source lang="java">
import javax.swing.DefaultListModel; import javax.swing.JList; public class Main {
public static void main(String[] argv) throws Exception {
DefaultListModel model = new DefaultListModel();
JList list = new JList(model);
// Replace the 2nd item
int pos = 1;
model.set(pos, "b");
}
}
</source>
