ArrayLists and Iterators
10. Summary List Interface
Answer:
0, just as with an array.
Summary List<E> Interface
List<E> Interface
Here is a summary of the List<E> Interface. For the full interface see the Java documentation.
| Method | What it Does |
|---|---|
boolean add(E elt) |
Appends element elt to the end of the list. |
void add(int index, E elt) |
Inserts element elt at the specified index. |
E remove(int index) |
Removes the element at the specified index. |
void clear() |
Remove all elements, so the list is now empty. |
int indexOf(Object elt) |
Searches for the first occurrence of elt, testing for equality using the equals(Object) method. |
boolean isEmpty() |
tests if the list is empty |
E set(int index, E elt) |
Replaces the element at index with the specified element elt. |
| . . . many more . . . | . . . |
The E in these descriptions means reference to object of type E or of its subclasses. Of course, the List must have been constructed to hold references to that type.
Question 10:
Here is a declaration and construction of a
ArrayList:ArrayList<String> data = new ArrayList<String>(10);
Which of the following statements will work?
data.add( "Irene Adler" );
data.add( new String("Laura Lyons") );
data.add( 221 );
data.add( new Integer( 221 ) );