Java Code:
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Shell;

public class RowLayoutSample {
  Display display = new Display();
  Shell shell = new Shell(display);

  public RowLayoutSample() {
    RowLayout rowLayout = new RowLayout();
    //rowLayout.fill = true;
    //rowLayout.justify = true;
    //rowLayout.pack = false;
    //rowLayout.type = SWT.VERTICAL;
    //rowLayout.wrap = false;
    shell.setLayout(rowLayout);
    Button button1 = new Button(shell, SWT.PUSH);
    button1.setText("button1");
    button1.setLayoutData(new RowData(100, 35));
    List list = new List(shell, SWT.BORDER);
    list.add("item 1");
    list.add("item 2");
    list.add("item 3");
    Button button2 = new Button(shell, SWT.PUSH);
    button2.setText("button #2");        
    //shell.setSize(120, 120);
    shell.pack();
    shell.open();

    // Set up the event loop.
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        // If no more entries in event queue
        display.sleep();
      }
    }

    display.dispose();
  }

  private void init() {

  }

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