JTree範例

package net.codejava.swing;

import javax.swing.JFrame;

import javax.swing.JTree;

import javax.swing.SwingUtilities;

import javax.swing.tree.DefaultMutableTreeNode;

public class TreeExample extends JFrame

{

    private JTree tree;

    public TreeExample() {

        //create the root node

        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");

        //create the child nodes

        DefaultMutableTreeNode vegetableNode = new DefaultMutableTreeNode("Vegetables");

        DefaultMutableTreeNode vegetableNode = new DefaultMutableTreeNode("Vegetables");

            vegetableNode.add(new DefaultMutableTreeNode("Capsicum"));

            vegetableNode.add(new DefaultMutableTreeNode("Carrot"));

            vegetableNode.add(new DefaultMutableTreeNode("Tomato"));

            vegetableNode.add(new DefaultMutableTreeNode("Potato"));

        DefaultMutableTreeNode fruitNode = new DefaultMutableTreeNode("Fruits");

            fruitNode.add(new DefaultMutableTreeNode("Banana"));

            fruitNode.add(new DefaultMutableTreeNode("Mango"));

            fruitNode.add(new DefaultMutableTreeNode("Apple"));

            fruitNode.add(new DefaultMutableTreeNode("Grapes"));

            fruitNode.add(new DefaultMutableTreeNode("Orange")

        //add the child nodes to the root node

        root.add(vegetableNode);

        root.add(fruitNode);

        

        //create the tree by passing in the root node

        tree = new JTree(root);

        add(tree);

        

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        this.setTitle("JTree Example");      

        this.pack();

        this.setVisible(true);

    }

    

    public static void main(String[] args)

    {

        SwingUtilities.invokeLater(new Runnable() {

            @Override

            public void run() {

                new TreeExample();

            }

        });

    }      

}