Answers to Self-Check Problems - Building Java Programs: A Back to Basics Approach - page 1078

Chapter 10
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. You
should use an ArrayList instead of an array if you don't know how many
elements you'll need in advance, or if you plan to add items to or remove items
from the middle of your dataset.
2. ArrayList<String> list = new ArrayList<String>();
list.add("It");
list.add("was");
list.add("a");
list.add("stormy");
list.add("night");
The list's type is ArrayList<String> and its size is 5.
3. list.add(3, "dark");
list.add(4, "and");
4. list.set(1, "IS");
5. for (int i = 0; i < list.size(); i++) {
if (list.get(i).indexOf("a") >= 0) {
list.remove(i);
i--; // so the new element i will be checked
}
}
6. ArrayList<Integer> numbers = new ArrayList<Integer>();
for (int i = 0; i < 10; i++) {
numbers.add(2 * i);
}
7. public static int maxLength(ArrayList<String> list) {
int max = 0;
for (int i = 0; i < list.size(); i++) {
String s = list.get(i);
if (s.length() > max) {
max = s.length();
}
}
return max;
}
8. System.out.println(list.contains("IS"));
9. System.out.println(list.indexOf("stormy"));
System.out.println(list.indexOf("dark"));