Unit 7 Review ArrayLists ANSWERS.pdf - AP Computer Science...

AP Computer Science Name________________________________Date_________
REVIEW Unit 6B ArrayLists
Chapter 7
1) Which statements are true regarding the differences between arrays and array lists?
I. Arrays are better if the size of a collection will not change
II. Array lists are more efficient than arrays
III. Array lists are easier to use than arrays
a) I, II
b) I, III
c) II, III
d) I, II, III
Answer: B
2) What is the value of the count variable after the execution of the given code snippet?
ArrayList<Integer> num = new ArrayList<Integer>();
num.add(4);
num.add(3);
num.add(5);
int count = 0;
for (int i = 0; i < num.size(); i++)
{
if (num.get(i) % 2 != 0)
{
count++;
}
}
3) Consider the following code snippet:
public static void check(ArrayList<Integer> chknum1)
{
int cnt = 0;
for(int i = 0; i < chknum1.size(); i++)
{
if(chknum1.get(i) == 0)
{
cnt++;
}
}
System.out.println("The total 0 values in the list are: " + cnt);
}
Which one of the following is true about the check method in the given code snippet?
1