Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
Question
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Chapter 18, Problem 8PP
Program Plan Intro

Implementing the method “map()”

Program plan:

Filename: “Pair.java”

This code snippet creates a class “Pair”. In the code,

  • Define a class “Pair”.
    • Declare the class members “first” and “second”.
    • Define the constructor “Pair()”.
      • Set the class members.
    • Define the getter “getFirst()”.
      • Return the value of “first”.
    • Define the getter “getSecond()”.
      • Return the value of “second”.

Filename: “ListUtil.java”

This code snippet creates an interface “ListUtil”. In the code,

  • Import the required packages.
  • Define a class “ListUtil”.
    • Define the generic method “map()”.
      • Create a list “result” of type “List<T>”.
      • Iterate a “for” loop,
        • Add elements to “result”.
      • Return “result”.

Filename: “MapTester.java”

This code snippet creates a class “MapTester”. In the code,

  • Define a class “MapTester”.
    • Define the “main” method.
      • Define a string array “words”.
      • Create a list “wordsList”.
      • Call the method “map()” and set the result to “sizes”.
      • Create an iterator “iter”.
      • Print the token of “wordsList” using “iter”.
      • Print “first=second”.
      • Print the expected token.
      • Print the token of “wordsList” using “iter”.
      • Print “first=second”.
      • Print the expected token.
      • Create an iterator “intItr”.
      • Print the token of “wordsList” using “iter”.
      • Print “first=second”.
      • Print the expected token.
      • Print the token of “wordsList” using “iter”.
      • Print “first=second”.
      • Print the expected token.

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