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这是一个英文版的《Java程序设计与问题解决》现在好多大学都当成教材

ActionDemo:
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- replaced button=setAction(action) with button.setAction(action);
	toolbar.add(button) (as of 1.3)
- extends JPanel instead of extends JFrame
- BorderLayout.PAGE_START instead of BorderLayout.NORTH
- Standardized main method.
- Use EXIT_ON_CLOSE.
- Made textArea uneditable.
- Switched to icons in Graphics Repository (Back24, Up24, Forward24
	instead of middle.gif, left.gif, right.gif)
- Converted to getResource
- Converted anonymous inner classes (for actions) to named
  AbstractAction subclasses (LeftAction, RightAction, MiddleAction)
- separated the logic for the menu and the toolbar into separate methods
	(createMenuBar and createToolBar)
- setDefaultLookAndFeelDecorated(true)

BorderDemo:
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- Standardized main method.
- Use EXIT_ON_CLOSE.
- setDefaultLookAndFeelDecorated(true)
- Added lowered etched border (new in 1.3)

CustomIconDemo:
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- Standardized main method.
- Use EXIT_ON_CLOSE.
- setDefaultLookAndFeelDecorated(true)
- Converted to getResource for the middle icon

AccessibleScrollDemo:
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- Same changes as for components/ScrollDemo