以下是一个关于JTree构建模型的例子，代码贴出来如下:
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();
}
}
截图：
