Login    New User    Forgot Password    Help      

Tree

Java Tutorials

Example Tree

// Tree
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;

 

public class swing7 extends JApplet
{

JTree tree;
JTextField jtf;

 

public void init()
{
Container contentPane = getContentPane();

contentPane.setLayout(new BorderLayout());

DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options");

DefaultMutableTreeNode a = new DefaultMutableTreeNode("A");
top.add(a);
DefaultMutableTreeNode a1 = new DefaultMutableTreeNode("A1");
a.add(a1);
DefaultMutableTreeNode a2 = new DefaultMutableTreeNode("A2");
a.add(a2);

 

DefaultMutableTreeNode b = new DefaultMutableTreeNode("B");
top.add(b);
DefaultMutableTreeNode b1 = new DefaultMutableTreeNode("B1");
b.add(b1);
DefaultMutableTreeNode b2 = new DefaultMutableTreeNode("B2");
b.add(b2);
DefaultMutableTreeNode b3 = new DefaultMutableTreeNode("B3");
b.add(b3);

 

tree = new JTree(top);

int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;

JScrollPane jsp = new JScrollPane(tree, v,h);

contentPane.add(jsp,BorderLayout.CENTER);

jtf = new JTextField(" ",20);
contentPane.add(jtf, BorderLayout.SOUTH);

tree.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent me)
{
doMouseClicked(me);
}
});
}

void doMouseClicked(MouseEvent me)
{
TreePath tp = tree.getPathForLocation(me.getX(), me.getY());
if(tp != null)
jtf.setText(tp.toString());
else
jtf.setText(" ");
}
}

 

Ouput

Java Tutorials