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Law of Demeter

• Example: Mail system in chapter 2
  Mailbox currentMailbox = mailSystem.findMailbox(...);
• Breaks encapsulation
• Suppose future version of MailSystem uses a database
• Then it no longer has mailbox objects
  
• Common in larger systems
• Karl Lieberherr: Law of Demeter
• Demeter = Greek goddess of agriculture, sister of Zeus

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