
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
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Question
Chapter 18, Problem 10PE
Program Plan Intro
“hashCode” and equals method for “Pair”
Program plan:
Filename: “Pair.java”
This code snippet creates a class “Pair”. In the code,
- Define a class “Pair”.
- Declare a variable “first” of type “T”.
- Declare a variable “second” of type “S”.
- Define the constructor “Pair ()”.
- Set the value of “first”.
- Set the value of “second”.
- Define the method “getFirst()”.
- Return the value of “first”.
- Define the method “getSecond()”.
- Return the value of second.
- Define a method “equals”.
- Define a pair “other”.
- Return true if “first” is equal.
- Define a method “hashCode”,
- Set “h”.
- Return “h”.
Filename: “HashMap.java”
This code snippet creates a class “HashMap”. In the code,
- Import the required packages.
- Define a class “HashMap”.
- Define a hash set “set”.
- Define the constructor “HashMap ()”.
- Set hash set “set”.
- Define a method “put”.
- Define a pair “p”.
- Call “remove()” on “p”.
- Call “add()” on “p”.
- Define a method “get()”.
- Iterate a “for” loop,
- If the “first” of “pair” equal to “key”.
- Call the method “getSecond” using “pair” and return the value.
- Return null value.
- Call the method “getSecond” using “pair” and return the value.
- Define a method “remove()”.
- Iterate a “for” loop,
- If the “first” of “pair” equal to “key”.
- Call “remove()”.
- Call the method “getSecond” using “pair” and return the value.
- Return null value.
- Define a method “keySet()”.
- Define a set “keySet”.
- Iterate a “for” loop,
- Call the method “add()” using “keySet”.
- Return “keySet”.
- Call the method “add()” using “keySet”.
- Define a method “size()”.
- Return the size.
Filename: “MapTester.java”
This code snippet creates a class “MapTester”. In the code,
- Import the required packages.
- Define a class “MapTester”.
- Define the “main” method.
- Define a Hash map “favoriteColors”.
- Add values to “favoriteColors” using the method “add()”.
- Call the method “remove()” to remove the element from “favoriteColors”.
- Get the value “Romeo” from “favoriteColors” and print it.
- Print the expected result.
- Get “Juliet” from the “favoriteColors”.
- Print the expected value.
- Get the size of the “favoriteColors” and print on the screen.
- Print the expected value.
- Create a set “keys”.
- Print the size of “keys”.
- Print the expected result.
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Chapter 18 Solutions
Big Java Late Objects
Ch. 18.1 - Prob. 1SCCh. 18.1 - Prob. 2SCCh. 18.1 - Prob. 3SCCh. 18.1 - Prob. 4SCCh. 18.1 - Prob. 5SCCh. 18.2 - Prob. 6SCCh. 18.2 - Prob. 7SCCh. 18.2 - Prob. 8SCCh. 18.2 - Prob. 9SCCh. 18.2 - Prob. 10SC
Ch. 18.3 - Prob. 11SCCh. 18.3 - Prob. 12SCCh. 18.3 - Prob. 13SCCh. 18.3 - Prob. 14SCCh. 18.3 - Prob. 15SCCh. 18.4 - Prob. 16SCCh. 18.4 - Prob. 17SCCh. 18.4 - Prob. 18SCCh. 18.4 - Prob. 19SCCh. 18.4 - Prob. 20SCCh. 18.4 - Prob. 21SCCh. 18.5 - Prob. 22SCCh. 18.5 - Prob. 23SCCh. 18.5 - Prob. 24SCCh. 18.5 - Prob. 25SCCh. 18.5 - Prob. 26SCCh. 18.5 - Prob. 27SCCh. 18 - Prob. 1RECh. 18 - Prob. 2RECh. 18 - Prob. 3RECh. 18 - Prob. 4RECh. 18 - Prob. 5RECh. 18 - Prob. 6RECh. 18 - Prob. 7RECh. 18 - Prob. 8RECh. 18 - Prob. 9RECh. 18 - Prob. 10RECh. 18 - Prob. 11RECh. 18 - Prob. 12RECh. 18 - Prob. 13RECh. 18 - Prob. 14RECh. 18 - Prob. 1PECh. 18 - Prob. 2PECh. 18 - Prob. 3PECh. 18 - Prob. 4PECh. 18 - Prob. 5PECh. 18 - Prob. 6PECh. 18 - Prob. 7PECh. 18 - Prob. 8PECh. 18 - Prob. 9PECh. 18 - Prob. 10PECh. 18 - Prob. 11PECh. 18 - Prob. 12PECh. 18 - Prob. 13PECh. 18 - Prob. 14PECh. 18 - Prob. 15PECh. 18 - Prob. 16PECh. 18 - Prob. 17PECh. 18 - Prob. 18PECh. 18 - Prob. 19PECh. 18 - Prob. 20PECh. 18 - Prob. 21PECh. 18 - Prob. 22PECh. 18 - Prob. 1PPCh. 18 - Prob. 2PPCh. 18 - Prob. 3PPCh. 18 - Prob. 4PPCh. 18 - Prob. 5PPCh. 18 - Prob. 6PPCh. 18 - Prob. 7PPCh. 18 - Prob. 8PP
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