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Separating Accessors and Mutators

• If we call a method to access an object, we don't expect the object to mutate
  
• Rule of thumb:
  Mutators should return void
• Example of violation: 
  

  StringTokenizer t = . . .;
  String s = t.nextToken();
  

• Yields current token and advances iteration
• What if I want to read the current token again?

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