CodeHS 5.4 & 5.5 ArrayList Stuff

Arrays have a fixed size.

• true

• false

ArrayLists have a fixed size.

• true

• false

How do we set up a class to use ArrayLists?

Select all that apply.

• import java.util.*;

• import java.lang.*;

• import java.lang.ArrayList;

• import java.ArrayList.*;

• import java.util.ArrayList;

Write a line of code to add the value 23 to the end of ArrayList foo.

Write a line of code to change the value at index 5 in the ArrayList foo to 42.

Write a line of code to retrieve the value at index 9 from the ArrayList foo and assign it to the int bar.

Write a line of code to get the length of ArrayList foo.

Write a line of code to remove the element at index 7 from the ArrayList foo.

ArrayList implements

• List

• Array

• ArrayList

• Object

• ListArray

An array is kinda like ...

• a list

• a group

• a chess board

• a phonebook ... wait, do you even know what that is?