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Polymorphism

• Which getIconWidth method is called?
• Could be
  
  • MarsIcon.getIconWidth
  • ImageIcon.getIconWidth
  • . . .
    
• Depends on object to which anIcon reference points, e.g.
  

  showMessageDialog(..., new MarsIcon(50))
  

• Polymorphism: Select different methods according to actual object type

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