Difference between revisions of "Comparator Assignment"

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===min===
 
===min===
 
  <nowiki>public static <E> Optional<E> min(E[] array, Comparator<E> comparator)</nowiki>
 
  <nowiki>public static <E> Optional<E> min(E[] array, Comparator<E> comparator)</nowiki>
 +
 +
'''Tip: ''' To create an Optional<E>, do the following: <code>Optional.of(E value)</code>.
  
 
==CompareApps==
 
==CompareApps==
 +
{{CodeToImplement|CompareApps|closestTo<br/>youngest<br/>mostPoints|compare.group}}
 +
 
===closestTo===
 
===closestTo===
 +
{{Warning | THIS SHOULD BE A ONE LINE SOLUTION! You should be calling CompareUtils.min()}}
 +
 
  <nowiki>public static Optional<Integer> closestTo(Integer[] values, int target)</nowiki>
 
  <nowiki>public static Optional<Integer> closestTo(Integer[] values, int target)</nowiki>
 +
 +
Return a call to CompareUtils.min() which contains an index within an Optional. Use a lambda to define a comparator as the second parameter to min(). What computation should this comparator return?
 +
 
===youngest===
 
===youngest===
 
  <nowiki>public static Optional<HockeyPlayer> youngest(HockeyPlayer[] players)</nowiki>
 
  <nowiki>public static Optional<HockeyPlayer> youngest(HockeyPlayer[] players)</nowiki>
 
===mostPoints===
 
===mostPoints===
 
  <nowiki>public static Optional<HockeyPlayer> mostPoints(HockeyPlayer[] players)</nowiki>
 
  <nowiki>public static Optional<HockeyPlayer> mostPoints(HockeyPlayer[] players)</nowiki>
 +
How can you make it so a call to min() ends up returning the max instead? 🤔
 +
 +
=Testing Your Solution=
 +
{{TestSuite|_MinCompareTestSuite|compare.group}}

Latest revision as of 20:36, 7 February 2023

Group Assignment

This is a group assignment.

Background

Comparator<T>

Optional<T>

HockeyPlayer

Code To Implement

CompareUtils

class: CompareUtils.java Java.png
methods: min
package: compare.group
source folder: student/src/main/java

min

public static <E> Optional<E> min(E[] array, Comparator<E> comparator)

Tip: To create an Optional<E>, do the following: Optional.of(E value).

CompareApps

class: CompareApps.java Java.png
methods: closestTo
youngest
mostPoints
package: compare.group
source folder: student/src/main/java

closestTo

Attention niels epting.svg Warning: THIS SHOULD BE A ONE LINE SOLUTION! You should be calling CompareUtils.min()
public static Optional<Integer> closestTo(Integer[] values, int target)

Return a call to CompareUtils.min() which contains an index within an Optional. Use a lambda to define a comparator as the second parameter to min(). What computation should this comparator return?

youngest

public static Optional<HockeyPlayer> youngest(HockeyPlayer[] players)

mostPoints

public static Optional<HockeyPlayer> mostPoints(HockeyPlayer[] players)

How can you make it so a call to min() ends up returning the max instead? 🤔

Testing Your Solution

class: _MinCompareTestSuite.java Junit.png
package: compare.group
source folder: testing/src/test/java