以下是一個關于JTree構建模型的例子，代碼貼出來如下:
package
?day18_JTree;
import
?java.awt.
*
;
import
?java.awt.event.
*
;
import
?javax.swing.
*
;
import
?javax.swing.tree.
*
;
class
?TreeEditFrame?
extends
?JFrame?
implements
?ActionListener?
{
????
private
?
static
?
final
?
long
?serialVersionUID?
=
?
1L
;
????
private
?DefaultTreeModel?model;
????
private
?JTree?tree;
????
private
?JButton?addSiblingButton;
????
private
?JButton?addChildButton;
????
private
?JButton?deleteButton;
????
????
public
?TreeEditFrame()?
{
????
????????setTitle(
"
TreeEditTest
"
);
????????setSize(
300
,?
200
);
????????
this
.pack();
????????
this
.setSize(
500
,
200
);
????????Toolkit?tool?
=
?Toolkit.getDefaultToolkit();
????????
double
?width?
=
?tool.getScreenSize().getWidth();
????????
double
?height?
=
?tool.getScreenSize().getHeight();
????????
this
.setLocation(((
int
)(width
-
this
.getWidth()))
/
2
,(
int
)(height
-
this
.getHeight())
/
2
);
????????
this
.setVisible(
true
);
????????
this
.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
????????TreeNode?root?
=
?makeSampleTree();
????????model?
=
?
new
?DefaultTreeModel(root);
????????tree?
=
?
new
?JTree(model);
????????DefaultTreeCellRenderer?renderer
=
new
?DefaultTreeCellRenderer();
????????renderer.setLeafIcon(
new
?ImageIcon(
"
1.gif
"
));
????????renderer.setClosedIcon(
new
?ImageIcon(
"
2.gif
"
));
????????renderer.setOpenIcon(
new
?ImageIcon(
"
3.gif
"
));
????????
//
renderer.setBackgroundNonSelectionColor(Color.BLUE);
????????
//
renderer.setBackgroundSelectionColor(Color.RED);
????????renderer.setBorderSelectionColor(Color.RED);
????????tree.setCellRenderer(renderer);
????????Container?contentPane?
=
?getContentPane();
????????JScrollPane?scrollPane?
=
?
new
?JScrollPane(tree);
????????contentPane.add(scrollPane,?
"
Center
"
);
????????JPanel?panel?
=
?
new
?JPanel();
????????addSiblingButton?
=
?
new
?JButton(
"
Add???Sibling
"
);
????????addSiblingButton.addActionListener(
this
);
????????panel.add(addSiblingButton);
????????addChildButton?
=
?
new
?JButton(
"
Add???Child
"
);
????????addChildButton.addActionListener(
this
);
????????panel.add(addChildButton);
????????deleteButton?
=
?
new
?JButton(
"
Delete
"
);
????????deleteButton.addActionListener(
this
);
????????panel.add(deleteButton);
????????contentPane.add(panel,?
"
South
"
);
????}
????
public
?TreeNode?makeSampleTree()?
{
????????DefaultMutableTreeNode?root?
=
?
new
?DefaultMutableTreeNode(
"
World
"
);
????????DefaultMutableTreeNode?country?
=
?
new
?DefaultMutableTreeNode(
"
USA
"
);
????????root.add(country);
????????DefaultMutableTreeNode?state?
=
?
new
?DefaultMutableTreeNode(
"
California
"
);
????????country.add(state);
????????DefaultMutableTreeNode?city?
=
?
new
?DefaultMutableTreeNode(
"
San???Jose
"
);
????????state.add(city);
????????city?
=
?
new
?DefaultMutableTreeNode(
"
Cupertino
"
);
????????state.add(city);
????????state?
=
?
new
?DefaultMutableTreeNode(
"
Michigan
"
);
????????country.add(state);
????????city?
=
?
new
?DefaultMutableTreeNode(
"
Ann???Arbor
"
);
????????state.add(city);
????????country?
=
?
new
?DefaultMutableTreeNode(
"
Germany
"
);
????????root.add(country);
????????state?
=
?
new
?DefaultMutableTreeNode(
"
Schleswig-Holstein
"
);
????????country.add(state);
????????city?
=
?
new
?DefaultMutableTreeNode(
"
Kiel
"
);
????????state.add(city);
????????
return
?root;
????}
????
public
?
void
?actionPerformed(ActionEvent?event)?
{
????????DefaultMutableTreeNode?selectedNode?
=
?(DefaultMutableTreeNode)?tree
????????.getLastSelectedPathComponent();
????????
if
?(selectedNode?
==
?
null
)
????????????
return
;
????????
if
?(event.getSource().equals(deleteButton))?
{
????????????
if
?(selectedNode.getParent()?
!=
?
null
)
????????????????model.removeNodeFromParent(selectedNode);
????????????
return
;
????????}
????????DefaultMutableTreeNode?newNode?
=
?
new
?DefaultMutableTreeNode(
"
New
"
);
????????
if
?(event.getSource().equals(addSiblingButton))?
{
????????????DefaultMutableTreeNode?parent?
=
?(DefaultMutableTreeNode)?selectedNode
????????????.getParent();
????????????
if
?(parent?
!=
?
null
)?
{
????????????????
int
?selectedIndex?
=
?parent.getIndex(selectedNode);
????????????????model.insertNodeInto(newNode,?parent,?selectedIndex?
+
?
1
);
????????????}
????????}
?
else
?
if
?(event.getSource().equals(addChildButton))?
{
????????????model.insertNodeInto(newNode,?selectedNode,?selectedNode
????????????????????.getChildCount());
????????}
????????TreeNode[]?nodes?
=
?model.getPathToRoot(newNode);
????????TreePath?path?
=
?
new
?TreePath(nodes);
????????tree.scrollPathToVisible(path);
????}
}
?
public
?
class
?TreeEditTest?
{
????
public
?
static
?
void
?main(String[]?args)?
{
????????JFrame?frame?
=
?
new
?TreeEditFrame();
????????frame.show();
????}
}
截圖：
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