Chapter 18, Problem 4PE

Program Plan Intro

Map to List

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: “PairUtil.java”

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

• Import the required packages.
• Define a class “PairTester”.
  • Define the “mapToList()” method.
    • Create an array list “result”.
    • Create a key set “keyset”.
    • Iterate a “for” loop,
      • Add pair to “result”.
    • Return the “result”.

Filename: “MapToListTester.java”

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

• Import the required packages.
• Define a class “MapToListTester”.
  • Define the “main” method.
    • Create a tree map “colors”.
    • Add values to “colors”.
    • Create a list “list”.
    • Create an iterator “iter”.
    • Get “item”.
    • Call “getFirst()” and print the result.
    • Print the expected value.
    • Call “getSecond()” and print the result.
    • Print the expected value.
    • Get “item”.
    • Call “getFirst()” and print the result.
    • Print the expected value.
    • Call “getSecond()” and print the result.
    • Print the expected value.
    • Get “item”.
    • Call “getFirst()” and print the result.
    • Print the expected value.
    • Call “getSecond()” and print the result.
    • Print the expected value.
    • Get “item”.
    • Call “getFirst()” and print the result.
    • Print the expected value.
    • Call “getSecond()” and print the result.
    • Print the expected value.