String[] list = new String[3];
list[3] = "dog" ;
Answer:
An ArrayIndexOutOfBounds exception is thrown and
(usually) the program halts.
ArrayList class
The ArrayList class builds upon the capabilities of arrays.
An ArrayList object contains an array of object references
plus many methods for managing that array.
The biggest convenience of a ArrayList is that you can
keep adding elements to it no matter what size it was originally.
The size of the ArrayList will automatically increase
and no information will be lost.
However, this convenience comes at a small price:
- The elements of an
ArrayListmust be object references, not primitive data likeintordouble. ArrayListoperations are slighly slower than array operations.
In the picture, "X" shows that a cell is empty.
The ArrayList in the picture is completely empty.
The "X" is conceptual;
the actual implementation of ArrayList uses
an unspecified means to keep track of empty cells.
QUESTION 4:
(Review: ) Can primitive values, like int be placed into an ArrayList?