Java Code:
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

/**
 * This class demonstrates TableTree
 */
public class TableTreeTest {
  // The number of rows and columns
  private static final int NUM = 3;

  /**
   * Runs the application
   */
  public void run() {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("TableTree Test");
    createContents(shell);
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }

  /**
   * Creates the main window's contents
   * 
   * @param shell the main window
   */
  private void createContents(final Shell shell) {
    shell.setLayout(new FillLayout());

    // Create the TableTree and set some attributes on the underlying table
    TableTree tableTree = new TableTree(shell, SWT.NONE);
    Table table = tableTree.getTable();
    table.setHeaderVisible(true);
    table.setLinesVisible(false);

    // Create the columns, passing the underlying table
    for (int i = 0; i < NUM; i++) {
      new TableColumn(table, SWT.LEFT).setText("Column " + (i + 1));
    }

    // Create the data
    for (int i = 0; i < NUM; i++) {
      // Create a parent item and add data to the columns
      TableTreeItem parent = new TableTreeItem(tableTree, SWT.NONE);
      parent.setText(0, "Parent " + (i + 1));
      parent.setText(1, "Data");
      parent.setText(2, "More data");

      // Add children items
      for (int j = 0; j < NUM; j++) {
        // Create a child item and add data to the columns
        TableTreeItem child = new TableTreeItem(parent, SWT.NONE);
        child.setText(0, "Child " + (j + 1));
        child.setText(1, "Some child data");
        child.setText(2, "More child data");
      }
      // Expand the parent item
      parent.setExpanded(true);
    }

    // Pack the columns
    TableColumn[] columns = table.getColumns();
    for (int i = 0, n = columns.length; i < n; i++) {
      columns[i].pack();
    }
  }

  /**
   * The application entry point
   * 
   * @param args the command line arguments
   */
  public static void main(String[] args) {
    new TableTreeTest().run();
  }
}