Arrays and ArrayLists

ArrayList()

constructor constructs empty list

list.size()

# of elements in the list

list.add(E object)

1. adds object to the end

2. always returns true

3. object not type E: run-time exception

list.add(int #, E object)

inserts element at index #

• automatically increments the size of the list by 1

• from position # and higher, index +1

list.get(int #)

returns the element at index #

list.set(int #, E object)

replaces element at index with object

list.remove(int #)

1. removes and returns element at index

2. automatically decrements the size of the list by 1

3. right of position index -1

ArrayIndexOutOfBoundsException

negative length or too big

IndexOutOfBoundsException

index is out of range

• set, get, remove: index neg || index >= size()

• add: index neg || index > size()

ConcurrentModificationException

add/deleting elements during an enhanced for loop