AP Comp Review

Assume that a and b have been defined and initialized as int values. The expression !(!(a != b) && (b > 7)) is equivalent to which of the following

(a != b) || (b <= 7))

int a = 9; int b = 5; while (a % b != 0) { int temp = a; a = b; b = temp % b; } System.out.println (b); What is the output?

1

What value is stored in result if int result = 13 - 3 * 6 / 4 % 3;

12

double x = 3.5467; int y = 5; y = (int)x; What is the value of y?

3

What is the range of the output of the following? System.out.println ((int)(Math.random() *20) + 5);

5 - 24

What is the output of the following: for (int i = 5; i <= 10*2; i+=5) { System.out.println (i + ' '); }

5 10 15 20

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}; What value will be returned as a result of the call mystery (nums) ?

7

Which of the following will declare and create a String name that holds the value "Janice"? I. String name = "Janice"; II. String name = new String ("Janice"); III. String name; name = new String "Janice";

I, II, and III

public class Point { private double x; private double y; public Point() { x = 0; y = 0; } public Point (double a, double b) { x = a; y = b; } //There may be instance variables, constructors, and methods that are not shown. } public class Circle { private Point center; private double radius; /** Constructs a circle where (a, b) is the center and r is the radius. */ public Circle (double a, double b, double r) { /* missing code */ } } Which of the following replacements for /* missing code */ will correctly implement the Circle constructor? I. center = new Point(); radius = r; II. center = new Point(a, b); radius = r; III. center = new Point(); center.x = a; center.y = b; radius = r;

II only

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; } } Which of the following changes to SomeClass will allow other classes to access but not modify the value of myC?

Include the method: public int getC() { return myC; }

What best describes the purpose of a class's constructor?

Initialize the fields of this instance of the class

Consider the following method. public int someCode(int a, int b, int c) { if ((a < b) && (b < c)) return a; if ((a >= b) && (b >= c)) return b; if ((a == b) || (a == c) || (b ==c)) return c; }

It is possible to reach the end of the method without returning a value.

Consider the following code segment. int num1 = 0; int num2 = 3; while ((num2 != 0) && ((num1 / num2) >= 0)) { num1 = num1 + 2; num2 = num2 - 1; } What are the values of num1 and num2 after the while loop completes its execution?

num1 = 6; num2 = 0;

What will the method String substring (int from, int to), which belongs to the String class, return?

returns a String beginning at from and ending at (to-1)