EBK BIG JAVA: EARLY OBJECTS, INTERACTIV
EBK BIG JAVA: EARLY OBJECTS, INTERACTIV
6th Edition
ISBN: 8220102010314
Author: Horstmann
Publisher: YUZU
Question
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Chapter 13, Problem 14PE
Program Plan Intro

Creating Substrings

Program plan:

Filename: “SubstringGenerator.java”

This program file is used to define a class “SubstringGenerator”. In the code,

  • Import the required packages.
  • Define a class “SubstringGenerator”.
    • Declare a string class member “word”.
    • Define a constructor “SubstringGenerator ()”.
      • Initialize the “word”.
    • Define a method “getSubstring()”.
      • Create an array list “result”.
      • If the length of the “word” is “0”.
        • Call the method “add()” to add the “word” to array list.
          • Create a string “shorterWord” to hold a substring.
          • Create an object “shorterSubstringGenerator” of class “SubstringGenerator”.
          • Create an array list “shorterWordSubstrings” to hold the substrings.
          • Iterate a “for” loop
            • Fill the array list “result”.
          • Iterate a “for” loop.
            • Create the substrings of the string “word” and add it to “result”.

Filename: “SubstringGeneratorDemo.java”

This program file is used to define a class “SubstringGeneratorDemo” to test the class “SubstringGenerator”. In the code,

  • Import the required packages.
  • Define a class “SubstringGeneratorDemo”.
    • Define a method “main()”.
      • Create the object “generator” of class “SubstringGenerator” to initialize “word” with value “rum”.
      • Create an array list “substrings” and fill it by calling the method “getSubstrings()”.
      • Call the method “sort()” of “Collections”to sort the substrings.
      • Print the “substrings”.
      • Print the expected substrings.
      • Create the object “generator” of class “SubstringGenerator” to initialize “word” with value “paper”.
      • Fill the array list by calling the method “getSubstrings()”.
      • Call the method “sort()” of “Collections”to sort the substrings.
      • Print the “substrings”.
      • Print the expected substrings.
      • Create the object “generator” of class “SubstringGenerator” to initialize “word” with value “coffee”.
      • Fill the array list by calling the method “getSubstrings()”.
      • Call the method “sort()” of “Collections”to sort the substrings.
      • Print the “substrings”.
      • Print the expected substrings.

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