define java BoxLayout, Box

boxl =	new BoxLayout(p, dir);	Creates layout for container p. dir is BoxLayout.X_AXIS BoxLayout.Y_AXIS. Note: must have already created p.
box =	new Box(dir);	Creates a Container with vertical or horizontal layout.
	p.add(widget);	Adds widget to the next position.
	These static Box methods create useful spacing components, which can be used in other layouts.
	Box.createVerticalStrut(n)	Creates a vertical spacer n pixels high.
	Box.createHorizontalStrut(n)	Creates a horizontal spacer n pixels wide.
	Box.createRigidArea(dim)	Spacer with width and height. dim is Dimension object, eg, new Dimension(10, 0).
	Box.createHorizontalGlue()	Creates expandable horizontal space.
	Box.createVerticalGlue()	Creates expandable vertical space.
	new Box.Filler(mn,prf,mx)	Creates a Box.Filler with min, preferred, and max sizes, each is Dimension object.