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Text File  |  1997-04-19  |  152 b   |  10 lines
  1. abstract class 2DShape extends Shape {
  2. }
  3.  
  4. class Square extends 2DShape {
  5.    double side;
  6.    double perimeter() {
  7.       return 4 * side;
  8.    }
  9. }
  10.