Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
Question
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Chapter 16, Problem 10PP
Program Plan Intro

A method “length()”

Program plan:

  • In a file “LispList.java”, create a class “LispList”,
    • Create an object for “EmptyList”.
    • Declare the method “isEmpty()”.
    • Declare the method “head()”.
    • Declare the method “tail()”.
    • Declare the method “cons()”.
    • Declare the method “length()”.
  • In a file “EmptyList.java”, create a class “EmptyList”,
    • Define the default constructor.
    • Define the “cons()” method to return the object of “NonEmptyList”.
    • Define the method “isEmpty()” to returns true.
    • Define the method “length()” that returns “0”.
    • Define the method “head()” that returns an exception “UnsupportedOperationException”.
    • Define the method “tail()” that returns an exception “UnsupportedOperationException”.
    • Define the method “toString()” that returns empty string.
  • In a file “NonEmptyList.java”, create a class “NonEmptyList”,
    • Declare the object for “Object” and “LispList”.
    • Define the constructor that assigns the object properties.
    • Define the “cons()” method to return the object of “NonEmptyList”.
    • Define the method “isEmpty()” that returns false.
    • Define the method “length()”,
      • Check whether the list is empty,
        • If it is true, returns “0”.
      • Otherwise, return the update length.
          • Define the method “head()” that returns the object properties of “Object”.
          • Define the method “tail()” that returns the object properties of “LispList”.
          • Define the method “toString()” that returns the string representation.
  • In a file “LispListTest.java”, create a class “LispListTest”,
    • Define the method “main()”,
      • Create an object for “EmptyList”.
      • Print the actual and expected output.
      • Create an object for “NonEmptyList”.
      • Print the actual and expected output.
      • Create another object for “NonEmptyList”.
      • Print the actual and expected output.
      • Assign the value returned from the method “cons()”.
      • Print the actual and expected output.

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Big Java Late Objects

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