How to add new element under existing element in jlist using java swing?

Question

I,m using jlist to display my database data. The process works fine with fetching data from database and displaying in jlist element. I need to display my data under a jlist element by a click event. Example: Jlist containing user names, once i click the particular user it should display the attributes of the user below the jlist element.

Suggest me, if there is a way to do this process or it is not possible to display under a particular jlist element.

Thanks-in-advance.

Answer 1

@Arunachalam This is example of tree node contain images by using DefaultTreeCellRenderer.

import java.awt.Component;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;

public class DatabaseTree implements TreeSelectionListener {

  JFrame frame;
  DefaultTreeModel treeModel;
  DefaultTreeCellRenderer cellRenderer;
  JScrollPane pane;
  JTree tree;
  Connection connection;
  PreparedStatement pst;
  ResultSet rs;
  List<String> databaseNode = new ArrayList<String>();

  public DatabaseTree() {
    // JFrame.setDefaultLookAndFeelDecorated(true);
    frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    DefaultMutableTreeNode root = new DefaultMutableTreeNode();
    root.setUserObject(new JLabel("Databases", new ImageIcon("/images/g.jpg"), JLabel.CENTER));
    treeModel = new DefaultTreeModel(root);
    try {
      Class.forName("com.mysql.jdbc.Driver");
      connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/ganesh", "root",
          "admina");
      pst = connection.prepareStatement("show databases");
      rs = pst.executeQuery();
      while (rs.next()) {
        String text = rs.getString(1);
        databaseNode.add(text);
        root.add(new DefaultMutableTreeNode(new JLabel(text, new ImageIcon("/images/g.jpg"),
            JLabel.CENTER)));
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    tree = new JTree(treeModel);
    tree.setCellRenderer(new MyTreeCellRenderer());
    tree.addTreeSelectionListener(this);
    tree.setRootVisible(true);
    tree.expandRow(0);
    pane = new JScrollPane(tree);
    frame.setContentPane(pane);
    frame.setVisible(true);

  }

  public static void main(String args[]) {
    new DatabaseTree();
  }

  @Override
  public void valueChanged(TreeSelectionEvent e) {
    DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.getPath().getLastPathComponent();
    String text = ((JLabel) node.getUserObject()).getText();
    JLabel label = null;
    if (databaseNode.contains(text)) {
      if (node.getChildCount() == 0) {
        try {
          pst = connection.prepareStatement("show tables in " + text);
          rs = pst.executeQuery();
          while (rs.next()) {
            String data = rs.getString(1);
            label = new JLabel(data);
            node.add(new DefaultMutableTreeNode(label));
          }
        } catch (Exception ee) {
          ee.printStackTrace();
        }
      }
    }
  }

  class MyTreeCellRenderer extends DefaultTreeCellRenderer {

    JLabel label;

    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected,
                                                  boolean expanded, boolean leaf, int row,
                                                  boolean hasFocus) {

      DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
      label = (JLabel) node.getUserObject();

      if (selected) {
        label.setBackground(backgroundSelectionColor);
        label.setForeground(textSelectionColor);
      } else {
        label.setBackground(backgroundNonSelectionColor);
        label.setForeground(textNonSelectionColor);
      }
      return label;
    }
  }
}