?? simpletree.java
字號(hào):
/**
@version 1.01 2001-07-17
@author Cay Horstmann
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
/**
This program shows a simple tree.
*/
public class SimpleTree
{
public static void main(String[] args)
{
JFrame frame = new SimpleTreeFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
/**
This frame contains a simple tree that displays a
manually constructed tree model.
*/
class SimpleTreeFrame extends JFrame
{
public SimpleTreeFrame()
{
setTitle("SimpleTree");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// set up tree model data
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);
// construct tree and put it in a scroll pane
JTree tree = new JTree(root);
Container contentPane = getContentPane();
contentPane.add(new JScrollPane(tree));
}
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 200;
}
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