Java by API/org.eclipse.swt.custom/TableTree

new TableTree(Shell parent, int style)

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TableTree;
import org.eclipse.swt.custom.TableTreeItem;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
public class MainClass {
  public static void main(String[] a) {
    
    final Display d = new Display();
    final Shell shell = new Shell(d);
    shell.setSize(250, 200);
    
    
    shell.setLayout(new FillLayout());
    TableTree tableTree = new TableTree(shell, SWT.NONE);
    Table table = tableTree.getTable();
    table.setHeaderVisible(true);
    table.setLinesVisible(false);
    for (int i = 0; i < 3; i++) {
      new TableColumn(table, SWT.LEFT).setText("Column " + (i + 1));
    }
    for (int i = 0; i < 3; i++) {
      TableTreeItem parent = new TableTreeItem(tableTree, SWT.NONE);
      parent.setText(0, "Parent " + (i + 1));
      parent.setText(1, "Data");
      parent.setText(2, "More data");
      for (int j = 0; j < 3; j++) {
        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");
      }
      parent.setExpanded(true);
    }
    // Pack the columns
    TableColumn[] columns = table.getColumns();
    for (int i = 0, n = columns.length; i < n; i++) {
      columns[i].pack();
    }
    
    
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!d.readAndDispatch())
        d.sleep();
    }
    d.dispose();
  }
}