AP CS - Java - gonimbus

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This quiz randomly generates 20 questions as asked in AP Computer Science A (AP CSA) - Programming in Java.

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AP Computer Science A (AP CSA) - Programming in Java

This quiz randomly generates 20 questions (in 30 mins) as asked in AP Computer Science A (AP CSA) - Programming in Java.

1 / 20

Which of the following is the output of the code below?

double[] array = new double[4];

int increment = 1;

for (double a: array){

System.out.println(a + increment);

increment += 2;

}

2.0, 3.0, 4.0, 5.0

0.0, 2.0, 4.0, 6.0

1.0, 3.0, 5.0, 7.0

0.0, 0.0, 0.0, 0.0

1.0, 3.0, 3.0, 3.0

3 / 20

Question

It is not possible to separate n into digits without the help of a temporary variable.

nRemaining prevents the parameter num from being altered.

nRemaining enhances the readability of the algorithm.

On exiting the method, the value of nRemaining may be reused.

nRemaining is needed as the left-hand side operand for integer division.

4 / 20

What is the output?

S 6

S 5

S -1

w 7

5 / 20

Which statement is true about the switch statement?

It must contain the default section.

The break statement, at the end of each case block, is optional.

Its case label literals can be changed at runtime.

Its expression must evaluate to a collection of values.

6 / 20

What is the result of the following expression if x = 5 and y = 10?

!(x > 0 || y < 10) && (x + y == 15)

true

false

Compilation error

Runtime error

7 / 20

What is the output ?

-3 4 5 6

3 4 3 6

5 4 5 6

3 6 4 6

8 / 20

Question

list[i] = (int) (Math.random() * 101);

list.add((int) (Math. random() * 101));

list[i] = (int) (Math.random() * 100);

list.add(new Integer (Math. random() * 100))

list [i] = (int) (Math.random() * 100) + 1;

9 / 20

What is the output?

vacation

work

Error

No output

10 / 20

Which statement about parameters is false?

The scope of parameters is the method in which they are defined.

Static methods have no implicit parameter this.

Two overloaded methods in the same class must have parameters with different names.

All parameters in Java are passed by value.

Two different constructors in a given class can have the same number of parameters.

11 / 20

The +=, -=, *=, /=, and %= operators are known as _______ operators.

covalent assignment

shorthand assignment

compound assignment

increment assignment

12 / 20

Which of the following is true about arithmetic operations?

I. An arithmetic operation that uses two integer values will evaluate to an integer value.

II. It is impossible to add 1 to a variable without ever using the number 1 in a statement.

III. An arithmetic operation that uses a double value will evaluate to a double value.

I only

II only

I and II

I and III

I, II, and III

13 / 20

Question

Rational r1 = new Rational();

Rational r2 = r1;

Rational r3 = new Rational (2,-3);

Rational r4 = new Rational (3.5);

Rational r5 = new Rational (10);

14 / 20

ASCII is a character-encoding scheme that uses a numeric value to represent each character. For example, the uppercase letter "G" is represented by the decimal (base 10) value 71. A partial list of characters and their corresponding ASCII values are shown in the table below.

A-65

B-66

C-67

D-68

ASCII characters can also be represented by binary numbers. According to ASCII character encoding, which of the following letters is represented by the 8-bit binary value: 0100 0010

ASCII Character: A

ASCII Character: B

ASCII Character: D

The table does not contain the value represented by the binary number 0100 0010

15 / 20

In a class Product, which of the following is the most common and correct usage of the this keyword?

To call a private method from a different class.

To distinguish between an instance variable and a parameter with the same name.

To create a new instance of the class from within a static method.

To access the super class's private variables.

16 / 20

Question

The Caller object in the driver class was not created with new.

The programmer forgot the return statement in getList that returns the list of integers.

The declaration of myNumbers is incorrect. It needed to be private ArrayList<Integer> myNumbers = null;

In the getList method, an attempt was made to add an Integer to an ArrayList that had not been created with new.

The shuffleNumbers algorithm went out of range, causing a null Integer to be shuffled into the ArrayList.

17 / 20

Which of the following is the output of the code below?

String myString = {"Hello", "World", "!"};

int i = 3;

while (i > 0) {

System.out.print(myString[i]);

System.out.print(" ");

i--;

}

Hello World !

Hello ! World

! Hello World

! World Hello

There is an error

18 / 20

Which of the following data types would best represent a student ID number that may have leading zeroes that must be included in the value?

Boolean

String

Double

Integer

19 / 20

8 bits is enough to represent 256 different numbers. How many total bits do you need to represent 512 (twice as many) numbers?

9 bits

10 bits

16 bits

17 bits

20 / 20

How many times will the word "Hello" be printed?

Your score is