Array Index Out of Bounds
In this lesson, we will look at the error we get when an index gets too large.
We'll cover the following
Completing the toArray
method
Let’s complete the definition of the method toArray
so that it is no longer a stub.
Because the array bag
is a private data field in the class BagOfStrings
, toArray
should return a reference to a copy of bag
instead of returning a reference to bag
itself. Doing so will prevent the client from damaging the bag’s contents. So, after allocating a new array of strings to hold the current contents of the bag, toArray
should copy the references in the array bag
to this new array and return the result to the client:
/** Retrieves all strings that are in this bag.
@return a newly allocated array of all the strings in this bag. */
public String[] toArray()
{
String[] result = new String[numberOfStrings];
// Copy numberOfStrings entries from bag to result:
for (int index = 1; index <= numberOfStrings; index++)
result[index] = bag[index];
return result;
} // End toArray
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