MP5: Geocache.java and GeocacheList.java

Geocache.java

Introduction

A Geocache Object is a custom data structure that you will be responsible for implementing in this class. (Geocaching is an outdoor recreational activity.)

Requirements

The requirements for Geocache.java are the following:

• Create a class 'Geocache' with two private instance variables 'x' 'y' of type double and a private integer 'id'.
• Create a class variable 'count' that will count the number of times a Geocache object has been created (instantiated). (Notice how this number is the same for each Geocache object, so only one copy of the number needs to be maintained. Use your knowledge of static variables to implement this.)
• Create two constructors. The first constructor takes two double parameters: the initial values of x and y. The second constructor takes another Geocache and initializes itself based on that geocache. For both constructors, set the Geocache's id to the current value of count (thus the first geocache will have the value zero when the Geocache is created), then increment the count value.
• Create 'resetCount()' and getNumGeocachesCreated(), which returns an int representing the number of geocaches created since resetCount() method was called.
• Create an equals() method that takes an object reference and returns "true" if the given object equals this object.

Hints

• You'll need 'instanceof' and cast to a (Geocache).
• Create a toString() method that returns a string representation of this object in the form '(x,y)' where 'x' and 'y' are the current values of x, y.
• Create getX(), getY(), setX(), setY() methods for x,y. (You can have eclipse auto create these for you). Note that the setX() method will only change the Geocache's x value if the given value is between -1000 and 1000 exclusive (i.e. -1000
• Create a get method for id.

GeocacheList.java

Introduction

A GeocacheList is simply a well managed array of Geocache objects.

Warning: You must get Geocache.java working before you start GeocacheList.java, because GeocacheList relies on Geocache to work (i.e., you will get a 0 on GeocacheList if Geocache is a 0).

You will have to complete the following code:

//UIUC CS125 FALL 2014 MP. File: GeocacheList.java, CS125 Project: Challenge5-DataStructures, Version: 2014-10-12T11:30:28-0500.439145392
/**
 * Complete the following GeocacheList, to ensure all unit tests pass. There are
 * several errors in the code below
 * 
 * Hint: Get the Geocache class working and passing its tests first.
 */
public class GeocacheList {
    private Geocache[] data = new Geocache[0];
    private int size = 0;
    /**
     * Returns the ith Geocache object in Geocache[] data.
     */
    public Geocache getGeocache(int i) {
        return null;
    }
    /**
     * Public getter method for private int size
     */
    public int getSize() {
        return 0;
    }
    /**
     * Default/No args constructor for GeocacheList
     */
    public GeocacheList() {
    }
    /**
     * Copy constructor for GeocacheList: This constructor should create a copy
     * of of a GeocacheList given a reference to that GeocacheList. Whether its
     * a deep copy or shallow copy is dependent on boolean deepCopy
     * 
     * If you dont know the difference between a deep copy and shallow copy,
     * please go to an office hour, since it's essential to this assignment
     */
    public GeocacheList(GeocacheList other, boolean deepCopy) {
        data = new Geocache[other.data.length];
        size = other.size;
    }
    /**
     * Adds a Geocache object to the end of the GeocacheList
     */
    public void add(Geocache p) {
        size++;
        if (size > data.length) {
            Geocache[] old = data;
            data = new Geocache[size * 2];
            for (int i = 0; i < old.length; i++)
                data[i] = old[i];
        }
        data[size - 1] = p;
    }
    public Geocache removeFromTop() {
        return null;
    }
    /**
     * Prints out all the content of the GeocacheList
     */
    public String toString() {
        StringBuffer s = new StringBuffer("GeocacheList:");
        for (int i = 0; i < size; i++) {
            if (i > 0)
                s.append(',');
            s.append(data[i]);
        }
        return s.toString();
    }
}