static class RightAlignedLine extends JPanel {
  *(int spacing, Component... components) {
    this(components);
    setSpacing(spacing);
  }
    
  *(Component... components) {
    setLayout(LetterLayout.rightAlignedRow());
    for (Component component : components)
      if (component != null)
        add(component);
  }
  
  void setSpacing(int spacing) {
    ((LetterLayout) getLayout()).setSpacing(spacing, spacing);
  }

  public void add(String text) {
    add(new JLabel(text));
  }
}

Began life as a copy of #1004150