Border Layout & flow layout - CSc 2700 Lecture 7 Border...

CSc 2700: Lecture # 7
Border Layout
September 18, 2008
1 Introduction
To add components to a frame, Java provides layout managers. Each layout
manager is an object that determines how components are placed in a frame.
DiFerent layout managers arrange widgets diFerently. In this lecture we will
discuss the border layout manager. In subsequent lectures, we will discuss
additional layout managers.
2 Border Layout
BorderLayout is the default layout manager for J±rame. If you do not in-
stantiate a layout manager for a frame, components are placed in a frame
using the BorderLayout layout manager. The BorderLayout manager divides
a frame into ²ve areas: NORTH, WEST, SOUTH, EAST, and CENTER.
The BorderLayout constructors are:
±igure 1: BorderLayout
1

BorderLayout()
BorderLayout(int horizGap, int vertGap)
where horizGap and vertGap specify horizontal and vertical space, in pixels,
between components. The method
add(Component c, int region)
places a component into a container. The parameter region is speciFed by
one of the constants
BorderLayout.NORTH,
BorderLayout.SOUTH,
BorderLayout.EAST,
BorderLayout.WEST, or
BorderLayout.CENTER
If no region is speciFed, a component is placed in the center region. Only
one component can be placed in a region and components are resized to Ft
the region. A button is a member of the JButton class. Three constructors
are:
• JButton() ,