Separating Components in a Row or Column

 
 Box box = new Box(BoxLayout.X_AXIS);
     
 // Glue spreads the components as far apart as
   // possible.
 box.add(component1);
 box.add(Box.createGlue());
 box.add(component2);
     
 // Strut spreads the components apart by a fixed
   // distance.
 int width = 10;
 box.add(Box.createHorizontalStrut(width));
 box.add(component3);