Question 1: Using BagInterface as a Client- clear Pretend that there is no clear
ID: 3882823 • Letter: Q
Question
Question 1: Using BagInterface as a Client- clear
Pretend that there is no clear() method in BagInterface. How can you use the other provided methods (from the client perspective) to accomplish what the clear method does? Do not use the toArray method.
BagInterface.java
/**
An interface that describes the operations of a bag of objects.
@author Frank M. Carrano
@author Timothy M. Henry
@version 4.0
*/
public interface BagInterface<T>
{
/** Gets the current number of entries in this bag.
@return The integer number of entries currently in the bag. */
public int getCurrentSize();
/** Sees whether this bag is empty.
@return True if the bag is empty, or false if not. */
public boolean isEmpty();
/** Adds a new entry to this bag.
@param newEntry The object to be added as a new entry.
@return True if the addition is successful, or false if not. */
public boolean add(T newEntry);
/** Removes one unspecified entry from this bag, if possible.
@return Either the removed entry, if the removal.
was successful, or null. */
public T remove();
/** Removes one occurrence of a given entry from this bag.
@param anEntry The entry to be removed.
@return True if the removal was successful, or false if not. */
public boolean remove(T anEntry);
/** Removes all entries from this bag. */
public void clear();
/** Counts the number of times a given entry appears in this bag.
@param anEntry The entry to be counted.
@return The number of times anEntry appears in the bag. */
public int getFrequencyOf(T anEntry);
/** Tests whether this bag contains a given entry.
@param anEntry The entry to locate.
@return True if the bag contains anEntry, or false if not. */
public boolean contains(T anEntry);
/** Retrieves all entries that are in this bag.
@return A newly allocated array of all the entries in the bag.
Note: If the bag is empty, the returned array is empty. */
public T[] toArray();
} // end BagInterface
Explanation / Answer
In order to accomplish the functionality of clear(). The client class can do the following
1. Check each the time the size of the Bag using isEmpty() method.
2. If the Bag is not empty, then use remove() to remove an entry. Continue until the Bag is empty.
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