JTree class of java

[Owen Fernandes]

Hello friend,

I am new to the field of java programming language. The 'JTree class' of java seems very complicated to understand. According to my knowledge JTree class is oftenly used class of java. I have referred many advanced java books for JTree class, but nothing was helpful. If you posses sound knowledge about the JTree class of java, then please let me know that. I would greatly appreciate your any help.

[Praetor]

A specific node in a Jtree class 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.

[Katty]

Please refer following example of JTree class of java:

import javax.swing.JTree;
import javax.swing.JFrame;
import javax.swing.JScrollPane;

public class JTreeDemo
 {
  public static void main(String args[]) {
    JFrame fU = new JFrame("JTree Sample");
    fU.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = fU.getContentPane();
    JTree tree = new JTree();
    JScrollPane scrollPane2 = new JScrollPane(tree);
    content.add(scrollPane2, BorderLayout.CENTER);
    fU.setSize(400, 200);
    fU.setVisible(true);
  }
}

[kelfro]

Hello friend,

A JTree class comprises four nested class, see below:

• JTree.TreeSelectionRedirector: This class is used for handling creation of TreeSelectionEvent
• JTree.AccessibleJTree: This class is used for implementation of access
• Tree.TreeModelHandler: This class is used for the updation of expandedState
• JTree.EmptySelectionModel: This class is has same working as TreeSelectionModel

[Zecho]

I have one program of java, which will depict you the use of JTree class of java. Please review following example :

import javax.swing.JTree;

public class TreeLinesDemo {
  public static void main(String args[]) {
    JFrame frameP = new JFrame("Tree Lines");
    frameP.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Container content = frameP.getContentPane();
    Box box = Box.createHorizontalBox();

    JTree tree01 = new JTree();
    tree01.putClientProperty("JTree.lineStyle", "Angled");
    JScrollPane scrollPane1 = new JScrollPane(tree01);
    tree01.setAutoscrolls(true);

    JTree tree02 = new JTree();
    JScrollPane scrollPane2 = new JScrollPane(tree02);

    box.add(scrollPane1, BorderLayout.WEST);
    box.add(scrollPane2, BorderLayout.EAST);

    frameP.getContentPane().add(box, BorderLayout.CENTER);
    frameP.setSize(200, 240);
    frameP.setVisible(true);
  }
}

[Reegan]

Hi,

we can use various fields with JTree class of java, following are some of them:

1. ROOT_VISIBLE_PROPERTY Field
2. invokesStopCellEditing Field
3. INVOKES_STOP_CELL_EDITING_PROPERTY Field
4. CELL_EDITOR_PROPERTY Field
5. ANCHOR_SELECTION_PATH_PROPERTY Field