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The Comparable Interface Type

• Collections has static sort method:
  

  ArrayList a = . . .
  Collections.sort(a);
  

• Objects in list must implement the Comparable interface type
  

  public interface Comparable
  {
     int compareTo(Object other);
  }
  

• object1.compareTo(object2) returns
• • Negative number if object1 less than object2
  • 0 if objects identical
  • Positive number if object1 greater than object2

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