JTree in Java Swing

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A control that displays a set of hierarchical data as an outline. A specific node in a tree can be identified either by a TreePath (an object that encapsulates a node and all of its ancestors), or by its display row, where each row in the display area displays one node. An expanded node is a non-leaf node (as identified by TreeModel.isLeaf(node) returning false) that will displays its children when all its ancestors are expanded. A collapsed node is one which hides them. A hidden node is one which is under a collapsed ancestor. All of a viewable nodes parents are expanded, but may or may not be displayed. A displayed node is both viewable and in the display area, where it can be seen.

JTree displays its data vertically. Each row displayed by the tree contains exactly one item of data, which is called a node. Every tree has a root node from which all nodes descend. By default, the tree displays the root node, but you can decree otherwise. A node can either have children or not. We refer to nodes that can have children — whether or not they currently have children — as branch nodes. Nodes that can not have children are leaf nodes.

The following JTree methods use "visible" to mean "displayed":

1. isRootVisible()
2. setRootVisible()
3. scrollPathToVisible()
4. scrollRowToVisible()
5. getVisibleRowCount()
6. setVisibleRowCount()

The next group of JTree methods use "visible" to mean "viewable" (under an expanded parent):

1. isVisible()
2. makeVisible()

The below program show how to use JTree in java swing...

/* =========================================================== File Name : JTreeDemo.java WebSite : http://javaproglang.blogspot.in/ Facebook : https://www.facebook.com/AdvanceJavaProgramming Twitter ID : https://twitter.com/AdvanceJava Created By : Bintu Chaudhary =========================================================== */ import java.awt.*; import java.net.*; import java.io.*; import java.sql.*; import javax.swing.*; import java.awt.event.*; import java.awt.print.*; import java.awt.geom.*; import javax.swing.event.*; import javax.swing.table.*; import javax.swing.border.*; import java.util.Calendar; import javax.swing.colorchooser.*; import javax.swing.tree.*; import javax.swing.text.html.*; import javax.swing.text.html.HTMLDocument; import javax.swing.ImageIcon; public class JTreeDemo extends JFrame implements ActionListener,TreeSelectionListener { Color c1=new Color(255,146,34); Color c2=new Color(251,254,120);//yellow Color c3=new Color(140,140,255);//Sky blue Color c4=new Color(120,120,230); Color c5=new Color(190,190,240); Color c6=new Color(147,255,174);//Light Green Font f1=new Font("Times New Roman",Font.BOLD,40); Font f2=new Font("Times New Roman",Font.BOLD,14); Font f3=new Font("Times New Roman",Font.BOLD,18); Font f4=new Font("Times New Roman",Font.BOLD,12); Font f5=new Font("Times New Roman",Font.BOLD,11); Font f6=new Font("COMIC SANS MS",Font.BOLD,22); Font fp=new Font("Times New Roman",Font.BOLD,45); Font fp1=new Font("COMIC SANS SERIF",Font.BOLD,30); Border border; Container c; JPanel p1,p2,p3,p4,p5; JLabel lbl_find,logoname; JButton btn_infor; JTextField txt_infor,txtTree; TextArea ta_east; JTree tree; DefaultMutableTreeNode root; DefaultMutableTreeNode file,edit,view,search,help,exit; DefaultMutableTreeNode newaddmission; DefaultMutableTreeNode update,delete; DefaultMutableTreeNode viewrcd; DefaultMutableTreeNode searchrcd; DefaultMutableTreeNode helpsys; DefaultMutableTreeNode exitsys; public JTreeDemo() { super("JTreeDemo"); c=getContentPane(); c.setLayout(new BorderLayout()); p1=new JPanel(); p2=new JPanel(); p3=new JPanel(); p4=new JPanel(); p5=new JPanel(); p1.setBackground(c5); p2.setBackground(c5); p3.setBackground(c5); p4.setBackground(c5); p5.setBackground(c5); logoname=new JLabel("Java Programming"); logoname.setFont(fp); logoname.setForeground(c4); p1.add(logoname); c.add(p1,"North"); root=new DefaultMutableTreeNode("Root Panel"); file=new DefaultMutableTreeNode(" File Panel "); newaddmission=new DefaultMutableTreeNode("New"); exitsys=new DefaultMutableTreeNode("Exit"); file.add(newaddmission); file.add(exitsys); root.add(file); edit=new DefaultMutableTreeNode(" Edit Panel "); update=new DefaultMutableTreeNode("Update"); delete=new DefaultMutableTreeNode("Delete"); edit.add(update); edit.add(delete); root.add(edit); search=new DefaultMutableTreeNode(" Search Panel "); searchrcd=new DefaultMutableTreeNode("Search"); search.add(searchrcd); root.add(search); help=new DefaultMutableTreeNode(" Help Panel "); helpsys=new DefaultMutableTreeNode("Help"); help.add(helpsys); root.add(help); tree=new JTree(root); tree.addTreeSelectionListener(this); p2.add(new JScrollPane(tree),BorderLayout.CENTER); p2.setSize(100,100); p2.setVisible(true); p2.setBorder(BorderFactory.createTitledBorder("JTreeDemo")); c.add(p2,"West"); ta_east=new TextArea(25,87); ta_east.setEditable(false); ta_east.setFont(f5); p3.add(ta_east); p3.setBorder(BorderFactory.createTitledBorder("Your Search")); c.add(p3,"East"); border=new BevelBorder(BevelBorder.LOWERED); lbl_find=new JLabel("Find What",SwingConstants.CENTER); txt_infor=new JTextField(35); txt_infor.setBorder(border); btn_infor=new JButton(" Find What "); btn_infor.setBackground(c5); lbl_find.setFont(f2); txt_infor.setFont(f5); btn_infor.setFont(f4); btn_infor.setMnemonic(KeyEvent.VK_F); btn_infor.addActionListener(this); p4.setBorder(BorderFactory.createTitledBorder("Find What")); p4.add(lbl_find); p4.add(txt_infor); p4.add(btn_infor); c.add(p4,"South"); c.add(p5,"Center"); //This JTextField Free txtTree=new JTextField(20); } public void valueChanged(TreeSelectionEvent te) { JTextArea tafree=new JTextArea(); tafree.setText(tree.getLastSelectedPathComponent().toString()); String str_Tree=tafree.getText(); String str_new ="New"; String str_exit ="Exit"; String str_up ="Update"; String str_del ="Delete"; String str_src ="Search"; String str_help ="Help"; if(str_Tree.equalsIgnoreCase(str_new)) { ta_east.append("\n--New--\n"); } if(str_Tree.equalsIgnoreCase(str_exit)) { ta_east.append("\n--Exit--\n"); } if(str_Tree.equalsIgnoreCase(str_up)) { ta_east.append("\n--Update--\n"); } if(str_Tree.equalsIgnoreCase(str_del)) { ta_east.append("\n--Delete--\n"); } if(str_Tree.equalsIgnoreCase(str_src)) { ta_east.append("\n--Search--\n"); } if(str_Tree.equalsIgnoreCase(str_help)) { ta_east.append("\n--Help--\n"); } } public void actionPerformed(ActionEvent ae) { if(ae.getSource()==btn_infor) { String str_infor=txt_infor.getText(); if(str_infor.length()==0) { JOptionPane.showMessageDialog(null,"Please Enter the Find Field"); txt_infor.requestFocus(); return; } else { // FindWhat(); } } } //________________________________________________________________________________________ /* MAIN CLASS */ //---------------------------------------------------------------------------------------- public static void main(String args[]) { JTreeDemo tdemo=new JTreeDemo(); tdemo.setSize(800,600); tdemo.setVisible(true); tdemo.setResizable(false); } } /* END OF THE JTreeDemo MAIN CLASS */ //******************************************************************************** /* JTreeDemo Created by Bintu Chaudhary */ //********************************************************************************

C:\>jdk1.4\bin>javac JTreeDemo.java
C:\>jdk1.4\bin>java JTreeDemo

"Output of JTreeDemo.class"

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Java Swing-II

JOptionPane Class	Input Dialog Boxes	JSliders
JProgressBars	JTables	JTabbedPane
JMenu	JPopupMenu	JToolBar
JFileChooser	JScrollBar	JScrollPane
JRootPane	JTextPane	JTree
JSplitPane	JDesktopPane	JEditorPane