!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Java provide correct implementations to

Question

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Java

provide correct implementations to complete.

/**
* A CacheList is a collection of Cache objects together with these six constraints:
*
* <ol>
* <li>A title constraint</li>
* <li>An owner constraint</li>
* <li>A minimum difficulty constraint</li>
* <li>A maximum difficulty constraint</li>
* <li>A minimum terrain constraint</li>
* <li>A maximum terrain constraint</li>
* </ol>
*/
public class CacheList
{
// The caches being managed by this CacheList. They are arranged in
// ascending order according to cache title.
private ArrayList<Cache> allCaches;

// TODO: Put remainder of representation here

/**
* Creates a CacheList from the specified Scanner. Each line of the Scanner should contain the description of a
* cache in a format suitable for consumption by the Cache constructor. The resulting CacheList should contain one
* Cache object corresponding to each line of the Scanner.
*
* Sets the initial value of the title and owner constraints to the empty string, sets the minimum difficulty and
* terrain constraints to 1.0, and sets the maximum difficulty and terrain constraints to 5.0.
*
* Throws an IOException if the Scanner throws an IOException, or an IllegalArgumentException if any of the
* individual lines are not appropriate for the Cache constructor.
*
* When an IllegalArgumentException e is thrown, e.getMessage() is the number of the line that was being read when
* the error that triggered the exception was encountered. Lines are numbered beginning with 1.
*/
public CacheList (Scanner caches) throws IOException
{
// TODO: Complete this implementation
allCaches = new ArrayList<Cache>();

// Sort the list of caches
Collections.sort(allCaches, (c1, c2) -> c1.getTitle().compareToIgnoreCase(c2.getTitle()));
}

/**
* Sets the title constraint to the specified value.
*/
public void setTitleConstraint (String title)
{
// TODO: Implement
}

/**
* Sets the owner constraint to the specified value.
*/
public void setOwnerConstraint (String owner)
{
// TODO: Implement
}

/**
* Sets the minimum and maximum difficulty constraints to the specified values.
*/
public void setDifficultyConstraints (double min, double max)
{
// TODO: Implement
}

/**
* Sets the minimum and maximum terrain constraints to the specified values.
*/
public void setTerrainConstraints (double min, double max)
{
// TODO: Implement
}

/**
* Returns a list that contains each cache c from the CacheList so long as c's title contains the title constraint
* as a substring, c's owner equals the owner constraint (unless the owner constraint is empty), c's difficulty
* rating is between the minimum and maximum difficulties (inclusive), and c's terrain rating is between the minimum
* and maximum terrains (inclusive). Both the title constraint and the owner constraint are case insensitive.
*
* The returned list is arranged in ascending order by cache title.
*/
public ArrayList<Cache> select ()
{
// TODO: Complete this implementation
ArrayList<Cache> caches = new ArrayList<Cache>();
return caches;
}

/**
* Returns a list containing all the owners of all of the Cache objects in this CacheList. There are no duplicates.
* The list is arranged in ascending order.
*/
public ArrayList<String> getOwners ()
{
// TODO: Complete this implementation
ArrayList<String> owners = new ArrayList<String>();

// Sort the list of owners
Collections.sort(owners, (s1, s2) -> s1.compareToIgnoreCase(s2));
return owners;
}
}

Explanation / Answer

import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.Scanner; public class CacheList { // The caches being managed by this CacheList. They are arranged in // ascending order according to cache title. private ArrayList allCaches; private String titleConstraint; private String ownerConstraint; private double minimumDifficultyConstraint; private double maximumDifficultyConstraint; private double minimumTerrainConstraint; private double maximumTerrainConstraint; // TODO: Put remainder of representation here /** * Creates a CacheList from the specified Scanner. Each line of the Scanner should contain the description of a * cache in a format suitable for consumption by the Cache constructor. The resulting CacheList should contain one * Cache object corresponding to each line of the Scanner. * * Sets the initial value of the title and owner constraints to the empty string, sets the minimum difficulty and * terrain constraints to 1.0, and sets the maximum difficulty and terrain constraints to 5.0. * * Throws an IOException if the Scanner throws an IOException, or an IllegalArgumentException if any of the * individual lines are not appropriate for the Cache constructor. * * When an IllegalArgumentException e is thrown, e.getMessage() is the number of the line that was being read when * the error that triggered the exception was encountered. Lines are numbered beginning with 1. */ public CacheList (Scanner caches) throws IOException { allCaches = new ArrayList(); while (caches.hasNextLine()) { try { allCaches.add(new Cache(caches.nextLine())); }catch (Exception e) { throw new IOException(e); } } minimumDifficultyConstraint = 1; minimumTerrainConstraint = 1; maximumDifficultyConstraint = 5; maximumTerrainConstraint = 5; // Sort the list of caches Collections.sort(allCaches, (c1, c2) -> c1.getTitle().compareToIgnoreCase(c2.getTitle())); } /** * Sets the title constraint to the specified value. */ public void setTitleConstraint (String title) { this.titleConstraint = title; } /** * Sets the owner constraint to the specified value. */ public void setOwnerConstraint (String owner) { this.ownerConstraint = owner; } /** * Sets the minimum and maximum difficulty constraints to the specified values. */ public void setDifficultyConstraints (double min, double max) { this.minimumDifficultyConstraint = min; this.maximumDifficultyConstraint = max; } /** * Sets the minimum and maximum terrain constraints to the specified values. */ public void setTerrainConstraints (double min, double max) { this.minimumTerrainConstraint = min; this.maximumTerrainConstraint = max; } /** * Returns a list that contains each cache c from the CacheList so long as c's title contains the title constraint * as a substring, c's owner equals the owner constraint (unless the owner constraint is empty), c's difficulty * rating is between the minimum and maximum difficulties (inclusive), and c's terrain rating is between the minimum * and maximum terrains (inclusive). Both the title constraint and the owner constraint are case insensitive. * * The returned list is arranged in ascending order by cache title. */ public ArrayList select () { ArrayList caches = new ArrayList(); Cache cache; for(int i = 0; i = minimumDifficultyConstraint && cache.getDifficulty() = minimumTerrainConstraint && cache.getTerrain()

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