Question: Hello, I am completely lost on how to implement the ( private static ArrayList data; // a reference to an ArrayList of String objects )
Hello,
I am completely lost on how to implement the ( private static ArrayList data; // a reference to an ArrayList of String objects ) into the methods. I've tried taking the data and turning it into an array but it becomes a mess... The driver and other codes are pertaining to the sortedstringlist are already done so I can only work with what is designated in the code... Can someone help explain how to use the ' private static ArrayList < String> data; ' ?
public class SortedStringList implements SortedStringListInterface{
private static ArrayList data; // a reference to an ArrayList of String objects
public SortedStringList()
// creates an empty list
{
} // end no-args constructor
public boolean isEmpty()
// Determines whether a list is empty
{
return true;
} // end isEmpty
public int size()
// Returns the number of items that are in a list
{
return 0;
} // end size
public void removeAll()
// Removes all the items in the list
{
} // end removeAll
public void add(String item) throws ListException
// Inserts item into its proper position in a sorted list
// Throws an exception if the item connot be placed on the list
{
try
{
}
catch(Exception e)
{
throw new ListException("Add to List failed: " + e.toString());
}
}
public String get(int index) throws ListIndexOutOfBoundsException
// Retrieves the item at position index of a sorted list, if 1 <= index <= size().
// The list is left unchanged by this operation.
// Throws an exception when index is out of range.
{
if (index > size())
{
throw new ListIndexOutOfBoundsException(index + " is an invalid index");
}
return null;
}
public void remove(String item) throws ListException
// Removes the item from a sorted list.
// Throws an exception if the item is not found.
{
try
{
}
catch(Exception e)
{
throw new ListException("Remove " + item.toString() + " from List failed: " + e.toString());
}
}
public int locateIndex(String item)
// Returns the position where the item belongs or exists in a sorted list;
// item and the list are unchanged.
{
return 0;
}
} // end SortedStringList
******************* sorted string interface ***********************************
// Interface SortedListInterface for the ADT SortedList.
// *********************************************************
public interface SortedStringListInterface
{
public boolean isEmpty();
// Determines whether a sorted list is empty
public int size();
// Returns the number of items that are in a sorted list
public void add(String item) throws ListException;
// Inserts item into it's proper position in a sorted list
// Throws an exception if the item cannot be placed on the list
public String get(int index) throws ListIndexOutOfBoundsException;
// Retrieves the item at position index of a sorted list, if 1 <= index <= size().
// The list is left unchanged by this operation.
// Throws an exception when index is out of range.
public void remove(String item) throws ListException;
// Removes the item from a sorted list.
// Throws an exception if the item is not found.
public int locateIndex(String item);
// Returns the position where the item belongs or exists in a sorted list;
// item and the list are unchanged.
public void removeAll();
// Removes all the items in the list
} // end ListInterface
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