import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
public class Main {
public static void main(String args[]) {
JFrame f = new JFrame("JTree Demo");
f.setSize(260, 240);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode aNode = new DefaultMutableTreeNode("A");
root.add(aNode);
DefaultMutableTreeNode bNode = new DefaultMutableTreeNode("B");
aNode.add(bNode);
DefaultMutableTreeNode cNode = new DefaultMutableTreeNode("C");
aNode.add(cNode);
cNode.add(new DefaultMutableTreeNode("D"));
cNode.add(new DefaultMutableTreeNode("E"));
DefaultMutableTreeNode fNode = new DefaultMutableTreeNode("F");
root.add(fNode);
DefaultMutableTreeNode gNode = new DefaultMutableTreeNode("G");
fNode.add(gNode);
fNode.add(new DefaultMutableTreeNode("H"));
gNode.add(new DefaultMutableTreeNode("I"));
JTree jtree = new JTree(root);
jtree.setEditable(true);
TreeSelectionModel tsm = jtree.getSelectionModel();
tsm.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
jtree.addTreeExpansionListener(new TreeExpansionListener() {
public void treeExpanded(TreeExpansionEvent tee) {
TreePath tp = tee.getPath();
System.out.println("Expansion: " + tp.getLastPathComponent());
}
public void treeCollapsed(TreeExpansionEvent tee) {
TreePath tp = tee.getPath();
System.out.println("Collapse: " + tp.getLastPathComponent());
}
});
jtree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent tse) {
TreePath tp = tse.getPath();
System.out.println("Selection event: " + tp.getLastPathComponent());
}
});
jtree.getModel().addTreeModelListener(new TreeModelListener() {
public void treeNodesChanged(TreeModelEvent tme) {
TreePath tp = tme.getTreePath();
Object[] children = tme.getChildren();
DefaultMutableTreeNode changedNode;
if (children != null)
changedNode = (DefaultMutableTreeNode) children[0];
else
changedNode = (DefaultMutableTreeNode) tp.getLastPathComponent();
System.out.println("Model change path: " + tp + "New data: "
+ changedNode.getUserObject());
}
public void treeNodesInserted(TreeModelEvent tme) {
}
public void treeNodesRemoved(TreeModelEvent tme) {
}
public void treeStructureChanged(TreeModelEvent tme) {
}
});
f.add(new JScrollPane(jtree));
f.setVisible(true);
}
}