JTree como se utiliza?

personajillo
16 de Abril del 2003
Como se añaden nodos y se borran, he visto varios ejemplos en paginas web pero los pongo igual y no funciona. Alguien me podrí decir algún manual decente para utilizarlo.

Gracias y saludos.

Luis
16 de Abril del 2003
Un ejemplo sencillo. Esta dentro de la aplicacion "java web start".

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import javax.accessibility.*;

import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.util.*;
import java.io.*;
import java.applet.*;
import java.net.*;

/**
* JTree Demo
*
* @version 1.3 10/10/99
* @author Jeff Dinkins
*/
public class TreeDemo extends DemoModule {

/**
* main method allows us to run as a standalone demo.
*/
public static void main(String[] args) {
TreeDemo demo = new TreeDemo(null);
demo.mainImpl();
}

/**
* TreeDemo Constructor
*/
public TreeDemo(SwingSet2 swingset) {
// Set the title for this demo, and an icon used to represent this
// demo inside the SwingSet2 app.
super(swingset, "TreeDemo", "toolbar/JTree.gif");

getDemoPanel().add(createTree(), BorderLayout.CENTER);
}

public JScrollPane createTree() {
DefaultMutableTreeNode top = new DefaultMutableTreeNode(getString("TreeDemo.music"));
DefaultMutableTreeNode catagory = null ;
DefaultMutableTreeNode artist = null;
DefaultMutableTreeNode record = null;

// open tree data
URL url = getClass().getResource("/resources/tree.txt");

try {
// convert url to buffered string
InputStream is = url.openStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader reader = new BufferedReader(isr);

// read one line at a time, put into tree
String line = reader.readLine();
while(line != null) {
// System.out.println("reading in: ->" + line + "<-");
char linetype = line.charAt(0);
switch(linetype) {
case 'C':
catagory = new DefaultMutableTreeNode(line.substring(2));
top.add(catagory);
break;
case 'A':
if(catagory != null) {
catagory.add(artist = new DefaultMutableTreeNode(line.substring(2)));
}
break;
case 'R':
if(artist != null) {
artist.add(record = new DefaultMutableTreeNode(line.substring(2)));
}
break;
case 'S':
if(record != null) {
record.add(new DefaultMutableTreeNode(line.substring(2)));
}
break;
default:
break;
}
line = reader.readLine();
}
} catch (IOException e) {
}

JTree tree = new JTree(top) {
public Insets getInsets() {
return new Insets(5,5,5,5);
}
};
return new JScrollPane(tree);
}

}