Source Code : Add and remove tree Node and expand the tree node

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Add and remove tree Node and expand the tree node

    
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class ModelJTree extends JFrame {

  private JTree tree;

  private DefaultTreeModel model;

  private DefaultMutableTreeNode rootNode;

  public ModelJTree() {
    DefaultMutableTreeNode philosophersNode = getPhilosopherTree();
    model = new DefaultTreeModel(philosophersNode);
    tree = new JTree(model);
    JButton addButton = new JButton("Add Philosopher");
    addButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        addPhilosopher();
      }
    });
    JButton removeButton = new JButton("Remove Selected Philosopher");
    removeButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        removeSelectedPhilosopher();
      }
    });
    JPanel inputPanel = new JPanel();
    inputPanel.add(addButton);
    inputPanel.add(removeButton);

    Container container = getContentPane();

    container.add(new JScrollPane(tree), BorderLayout.CENTER);

    container.add(inputPanel, BorderLayout.NORTH);

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(400, 300);
    setVisible(true);

  }

  private void addPhilosopher() {
    DefaultMutableTreeNode parent = getSelectedNode();
    if (parent == null) {
      JOptionPane.showMessageDialog(ModelJTree.this, "Select an era.", "Error",
          JOptionPane.ERROR_MESSAGE);

      return;
    }
    String name = JOptionPane.showInputDialog(ModelJTree.this, "Enter Name:");
    model.insertNodeInto(new DefaultMutableTreeNode(name), parent, parent.getChildCount());

  }

  private void removeSelectedPhilosopher() {
    DefaultMutableTreeNode selectedNode = getSelectedNode();
    if (selectedNode != null)
      model.removeNodeFromParent(selectedNode);
  }

  private DefaultMutableTreeNode getSelectedNode() {
    return (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
  }

  private DefaultMutableTreeNode getPhilosopherTree() {
    DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Philosophers");
    DefaultMutableTreeNode ancient = new DefaultMutableTreeNode("Ancient");
    rootNode.add(ancient);

    ancient.add(new DefaultMutableTreeNode("Socrates"));

    DefaultMutableTreeNode medieval = new DefaultMutableTreeNode("Medieval");
    rootNode.add(medieval);

    return rootNode;
  }
  public static void main(String args[]) {
    new ModelJTree();
  }
}
           
         
    
    
    
  

Thank with us