取出f层的DefaultMutableTreeNode node;
用node.add(new DefaultMutableTreeNode("你要的节点"));
这样就可以了
还可以用这方法,也是对node的。
insert(MutableTreeNode newChild, int childIndex)
用node.add(new DefaultMutableTreeNode("你要的节点"));
这样就可以了
还可以用这方法,也是对node的。
insert(MutableTreeNode newChild, int childIndex)
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怎样取出f层的DefaultMutableTreeNode node?
/*
* This code is based on an example provided by Richard Stanford,
* a tutorial reader.
*/import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.tree.DefaultMutableTreeNode;public class DynamicTreeDemo extends JPanel
implements ActionListener {
private int newNodeSuffix = 1;
private static String ADD_COMMAND = "add";
private static String REMOVE_COMMAND = "remove";
private static String CLEAR_COMMAND = "clear";
private DynamicTree treePanel; public DynamicTreeDemo() {
super(new BorderLayout());
//Create the components.
treePanel = new DynamicTree();
populateTree(treePanel); JButton addButton = new JButton("Add");
addButton.setActionCommand(ADD_COMMAND);
addButton.addActionListener(this);
JButton removeButton = new JButton("Remove");
removeButton.setActionCommand(REMOVE_COMMAND);
removeButton.addActionListener(this);
JButton clearButton = new JButton("Clear");
clearButton.setActionCommand(CLEAR_COMMAND);
clearButton.addActionListener(this); //Lay everything out.
treePanel.setPreferredSize(new Dimension(300, 150));
add(treePanel, BorderLayout.CENTER); JPanel panel = new JPanel(new GridLayout(0,1));
panel.add(addButton);
panel.add(removeButton);
panel.add(clearButton);
add(panel, BorderLayout.LINE_END);
} public void populateTree(DynamicTree treePanel) {
String p1Name = new String("Parent 1");
String p2Name = new String("Parent 2");
String c1Name = new String("Child 1");
String c2Name = new String("Child 2"); DefaultMutableTreeNode p1, p2; p1 = treePanel.addObject(null, p1Name);
p2 = treePanel.addObject(null, p2Name); treePanel.addObject(p1, c1Name);
treePanel.addObject(p1, c2Name); treePanel.addObject(p2, c1Name);
treePanel.addObject(p2, c2Name);
}
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (ADD_COMMAND.equals(command)) {
//Add button clicked
treePanel.addObject("New Node " + newNodeSuffix++);
} else if (REMOVE_COMMAND.equals(command)) {
//Remove button clicked
treePanel.removeCurrentNode();
} else if (CLEAR_COMMAND.equals(command)) {
//Clear button clicked.
treePanel.clear();
}
} /**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true); //Create and set up the window.
JFrame frame = new JFrame("DynamicTreeDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane.
DynamicTreeDemo newContentPane = new DynamicTreeDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane); //Display the window.
frame.pack();
frame.setVisible(true);
} public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}