Question 17

What is stored in the array arr after the following code executes? int[ ] arr = {17, 34, 43, 71}; int i = 0; while(i < arr.length) { if((arr[i] % 2) == 1) { arr[i] = arr[i] % 3; } else { arr[i] = arr[i] / 3; } i++; }

A){1, 11, 2, 10}

B){2, 10, 11, 1}

C){2, 11, 1, 2}

D){2, 11, 1, 10}

E)An ArrayIndexOutOfBoundsException occurs.

Question 18

What is the minimum number of locations a sequential search algorithm will have to examine when looking for a particular value in an array of 100 elements?

A)1

B)6

C)7

D)8

E)100

Question 19

Suppose you write a subclass of Insect named Ant. You add a new method named doSomething to the Ant class. You write a client class that instantiates an Ant object and invokes the doSomething method. Which of the following Ant declarations will NOT permit this?

1. Insect a = new Ant();
2. Ant a = new Ant();
3. Ant a = new Insect();

A)I only

B)II only

C)III only

D)I and II only

E)I and III only

Question 20

The following method is intended to remove all values from the ArrayList < Integer > aList that have the same value as val; however, this method does NOT work correctly. public void removeValue(ArrayList < Integer > aList, int val) { int i; for(i = 0; i < aList.size(); i++) { if(aList.get(i) == val) { aList.remove(i); } } } If aList initially contains 2 3 4 3 3 4 4 5 4 3 2 1 and val is equal to 3, then aList should contain 2 4 4 4 5 4 2 1 after removeValue is invoked. What does aList actually contain after removeValue is invoked?

A)2 4 4 4 5 4 2 1

B)2 4 3 4 4 5 4 2 1

C)2 4 4 3 4 4 5 4 2 1

D)2 4 3 4 4 5 4 3 2 1

E)2 4 3 3 4 4 5 4 3 2 1

Question 21

What is output by the following code? ArrayList < Integer > a = new ArrayList < Integer >(); ArrayList b = a; a.add(4); b.add(5); a.add(6); b.add(7); System.out.println(a.get(3));

A)An IndexOutOfBoundsException occurs.

B)4

C)5

D)6

E)7

Question 22

Assume that you have an array of integers named arr. Which of these code segments print the same results?

1. int i = 0; while(i < arr.length) { System.out.println(arr[i]); i++; }
2. int i; for(i = 0; i < arr.length; i++) { System.out.println(arr[i]); }
3. for(int i : arr) { System.out.println(i); }

A)II only

B)I and II only

C)II and III only

D)I and III only

E)I, II, and III

Question 23

Suppose the following array and integer are declared: int[] numbers = {4, 5, 6, 7}; int index = 1 + 6 % 4 * 2; What is the value of numbers[index]?

A)An ArrayIndexOutOfBoundsException occurs.

B)4

C)5

D)6

E)7

Question 24

To extend an abstract class, a class must

A)extend an interface

B)class implement at least one abstract method from the abstract class

C)include new methods

D)specify the keyword implements

E)specify the keyword extends