Question
Question 17 What is stored in the array arr after the following code executes? int[ ] arr = {17, 34, 43, 71}; int i =
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?
- Insect a = new Ant();
- Ant a = new Ant();
- 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?
- int i = 0; while(i < arr.length) { System.out.println(arr[i]); i++; }
- int i; for(i = 0; i < arr.length; i++) { System.out.println(arr[i]); }
- 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
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