1.
An ArrayList is a structure that stores a collection of objects inside itself as elements. Each element is associated with an integer index starting from 0.
2.
e.
3.
ArrayList<String> list = new ArrayList<String>();
list.add("It");
list.add("was");
list.add("a");
list.add("stormy");
list.add("night");
4.
List.add(3, “dark”);
List.add(4, “and”);
5.
list.set(1, “IS”);
6.
For(int x = 0; x < list.size(); x++)
{
If(list.get(x).indexOf(“a”) >= 0)
{
List.remove(x);
x--;
}
}

7.
ArrayList <Integer> num = new ArrayList <Integer>();
For(int x = 0; x < 10; x++)
{numbers.add(2*x);}
8.
Public static int maxLength (ArrayList<String> list)
{
Int max = 0;
For(int x = 0; x < list.size(); x++)
{
String n = list.get(x);
If(n.length() > max)
{
Max = n.length();
}
}
}
9.
System.out.println (list.contains(“IS”));
10.
System.out.println (list.indexOf(“stormy”));
System.out.println (list.indexOf(“dark”));
11.
for(int x = 0; x < list.size(); x++)
{System.out.println (n.toUpperCase());
12. throws a ConcurrentModificationException
13. use integer instead of int when declaring the new arraylist
14.
Wrapper class: class with the purpose of bridging primitive values and objects
Integer: object that holds int value
Int: primitive value type
15.
a. [1, 2, 6, 8]
b. [10, 30, 40, 20, 60, 50]
c. [-4, 1, 25, 4, 16, 9, 64, 36, 49]
16.
a. [20, 10, 20, 30, 30, 20]
b. [8, 7, 8, 2, 9, 7, 4, 4, 2, 8]
c. [33, 28, 33, -1, 3, 28, 17, 9, 33, 17, -1, 33]
17.
a.[72,20]
b. [1, 20, 18, 15, 11, 6]
c. [10, 90, 70, 40]
18.
a. [31, 21, 11]
b. [5, 8, 10, 3, 9]
c. [34, 10, 18, 29, 4, 0]