Question 1.
What does the following code print?

int x = 5;
double y = 2;
double z = x / y;
System.out.println(z);
      

Question 2.
What is printed by this code?

int a = 3;
int b = 4;
a += 2 * b - 1;
System.out.println(a);
      

Question 3.
Which of the following is a valid Java variable declaration that follows standard naming conventions?

Question 4.
Which of the following is not a primitive type in Java?

Question 5.
What does this code print?

double d = 4.9;
int n = (int) (d + 0.5);
System.out.println(n);
      

Question 6.
Which line correctly uses the Math class to get the absolute value of -7?

Question 7.
Given the method header public static int max(int a, int b), what is the return type?

Question 8.
What does this code print?

System.out.println(Math.max(4, 9) - Math.min(4, 9));
      

Question 9.
Which line correctly creates a Scanner to read from the keyboard?

Question 10.
What does this code print?

String s = "Cortado";
System.out.println(s.charAt(s.length() - 1));
      

Question 11.
What is printed by the following code?

String code = "AP CSA";
System.out.println(code.indexOf("CS"));
      

Question 12.
What is the sign of the result of "beta".compareTo("alpha")?

Question 13.
What value does this expression evaluate to?

Integer.parseInt("42") + 1
      

Question 14.
Which expression generates a random int from 0 to 4 (inclusive)?

Question 15.
Which of the following is a proper Javadoc comment for a method that computes a score?

Question 16.
What does this code print?

Point p1 = new Point(1, 2);
Point p2 = p1;
p1.translate(1, 1);
System.out.println(p2);
      

(Assume Point has a standard toString that shows its coordinates.)

Question 17.
Which list of steps is a correct algorithm (in plain English) for computing the average of two test scores?

Question 18.
Given the method:

public static double average(int a, int b) {
    return (a + b) / 2.0;
}
      

What does System.out.println(average(4, 10)); print?

Question 19.
What does this code print?

String msg = "code";
msg.toUpperCase();
System.out.println(msg);
      

Question 20.
Which statement about the int type in Java is true?

Question 21.
What is the value of the boolean expression (5 < 8 && 2 * 3 == 6)?

Question 22.
What does this code print?

int score = 85;
if (score >= 90) {
    System.out.println("A");
} else if (score >= 80) {
    System.out.println("B");
} else {
    System.out.println("C");
}
      

Question 23.
What is printed by this nested if statement?

int x = 5;
int y = 10;
if (x < y) {
    if (x % 2 == 1) {
        System.out.println("odd");
    } else {
        System.out.println("even");
    }
} else {
    System.out.println("none");
}
      

Question 24.
What does this loop print?

int count = 0;
int n = 3;
while (n > 0) {
    count += n;
    n--;
}
System.out.println(count);
      

Question 25.
Which statement about while and for loops is generally true?

Question 26.
What does this loop print?

int total = 0;
for (int i = 1; i <= 4; i++) {
    total += i * i;
}
System.out.println(total);
      

Question 27.
Assume values is an array with 5 elements. What is wrong with this loop?

for (int i = 0; i <= values.length; i++) {
    System.out.println(values[i]);
}
      

Question 28.
What does this code print?

String s = "Cortado";
int vowelCount = 0;
for (int i = 0; i < s.length(); i++) {
    char ch = Character.toLowerCase(s.charAt(i));
    if (ch == 'a' || ch == 'e' || ch == 'i'
            || ch == 'o' || ch == 'u') {
        vowelCount++;
    }
}
System.out.println(vowelCount);
      

Question 29.
What happens when this code runs?

int x = 0;
if (x != 0 && 10 / x > 1) {
    System.out.println("Big");
}
      

Question 30.
Which pair of boolean expressions are logically equivalent (for any int x)?

Question 31.
What does this loop print?

for (int i = 1; i <= 5; i += 2) {
    System.out.print(i + " ");
}
      

Question 32.
How many times does the word Hi get printed?

for (int row = 0; row < 3; row++) {
    for (int col = 0; col < 2; col++) {
        System.out.println("Hi");
    }
}
      

Question 33.
With respect to a positive integer n, which fragment executes its inner statement about n² times?

Question 34.
What happens when this loop runs?

int n = 10;
while (n > 0) {
    System.out.println(n);
}
      

Question 35.
What does this loop print?

int i = 1;
int product = 1;
while (i <= 3) {
    product *= i;
    i++;
}
System.out.println(product);
      

Question 36.
Assume the array nums is defined as: int[] nums = {4, 9, 2, 7}; What does this code print?

int max = nums[0];
for (int i = 1; i < nums.length; i++) {
    if (nums[i] > max) {
        max = nums[i];
    }
}
System.out.println(max);
      

Question 37.
What does this code print?

String s = "cortado";
for (int i = 0; i < s.length(); i++) {
    if (i % 2 == 0) {
        System.out.print(s.charAt(i));
    }
}
      

Question 38.
What is the value of flag after this code runs?

int x = 7;
boolean flag;
if (x > 0 && x % 2 == 1) {
    flag = true;
} else {
    flag = false;
}
System.out.println(flag);
      

Question 39.
What is printed?

int sum = 0;
for (int i = 2; i <= 10; i += 2) {
    sum += i;
}
System.out.println(sum);
      

Question 40.
Which of the following best describes short-circuit evaluation in Java?