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AP Computer Science Practice Exam A Questions and Answers
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AP Computer Science Practice Exam A Questions and Answers
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AP Computer Science Practice Exam A Questions and AnswersConsider the following method.
public static int mystery(int[] arr)
{ int x = 0
for (int k = 0; k < arr.length; k = k + 2) x = x + arr[k]
return x;
}
Assume that the array nums has been declared and initialized as follows. int[] nums = {3, 6, 1, 0, 1, 4, 2};
(A) 5
(B) 6
(C) 7
(D) 10
(E) 17 - Answer -(C) 7
Consider the following partial class declaration.
public class SomeClass
{
private int myA;
private int myB;
private int myC;
// Constructor(s) not shown
public int getA
{ return myA; }
public void setB(int value)
{ myB = value; }
The following declaration appears in another class.
SomeClass obj = new SomeClass();
Which of the following code segments will compile without error?
(A) int x = obj.getA(); (B) int x; obj.getA(x);
(C) int x = obj.myA
(D) int x = SomeClass.getA();
(E) int x = getA(obj); - Answer -(A) int x = obj.getA
Which of the following changes to SomeClass will allow other classes to access but not modify the value of myC ?
(A) Make myC public.
(B) public int getC() { return myC; }
(C) private int getC() { return myC; }
(D) public void getC(int x)
(E) private void getC(int x) { x = myC; } - Answer -(B) public int getC() { return myC; }
Consider the following code segment. int x = 7; int y = 3; if ((x < 10) && (y < 0)) System.out.printIn("Value is: " + x * y); else System.out.printIn("Value is: " + x / y);
What is printed as a result of executing the code segment
(A) Value is: 21
(B) Value is: 2.3333333
(C) Value is: 2
(D) Value is: 0
(E) Value is: 1 - Answer -(B) 2.3333333
Consider the following method.
public ArrayList<Integer> mystery(int n)
{ ArrayList<Integer> seq = new ArrayList<Integer>(); for (int k = 1; k <= n; k++) seq.add(new Integer(k * k + 3)); return seq
}
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