setBackground : Java Glossary

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setBackground

setBackground( 0xrrggbb ) sets the background colour of a component the next time it is painted. setForeground sets the colour of text painted on it. Note it is setBackground not setBackGround.

Gotchas

When you use Swing, use contentPane.setBackground not JComponent.setBackground or nothing will happen.
In a paintComponent method, you use Color c = getBackground(); graphics. setColor( c ); to load up the pen with colour to paint the background. Doing a plain setBackground has no effect.
Sometimes buttons in some L&Fs will ignore your setBackground. In that case use setContentAreaFilled( false ) then paint your own background in paintComponent.

AWT
colour
Component
contentPane
JComponent
paintComponent
Swing
transparent backgrounds

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