Questions from Quiz 1 + Quiz 2

Question 1

Which of the following is a constant, according to Java naming conventions?

read

MAX_VALUE

Test

!ReadInt

Answer 1

MAX_VALUE

Question 2

Which of these data types requires the least amount of memory?

short

double

byte

float

Answer 2

byte

Question 3

_____ are valid Java identifiers.

4+4

3ere

RE4$

int

Answer 3

RE4$

Question 4

A Java interpreter is a program that translates Java source code into Java bytecode.

True

False

Answer 4

False

Question 5

The compiler checks _______.

syntax errors

runtime errors

logic errors

Answer 5

Syntax Errors

Question 6

________ is invoked to create an object.

The main method

A constructor

A method with a return type

A method with the void return type

Answer 6

A constructor

Question 7

If you attempt to add an int, a byte, a long, and a float, the result will be a __________ value.

float

double

int

long

Answer 7

float

Question 8

If the computer displays an error message while executing your program, the program contains a(n) __________.

run-time error

hidden error

logic error

syntax error

Answer 8

run-time error

Question 9

What is the output for the following segment of code

intnum = 3, intNum = 1, intVal = 2, total = 0;

    total += intnum++ * 5;

    System.out.print("intNum : " + intNum + " intVal : " + intVal );

    System.out.println(" Total: " + total);

Answer 9

intNum : 1 intVal : 2
total : 15

because intnum++ in:
total += intnum++ * 5;

intnum ++ will use the current value of intnum in the operation then add 1 to it after the operation.

Question 10

Analyze the following code:

public class Test {
private int t;

public static void main(String[] args) {
int x;
System.out.println(t);
}
}

Options:
The variable t is private and therefore cannot be accessed in the main method.

The program compiles and runs fine.

The variable x is not initialized and therefore causes errors.

The variable t is not initialized and therefore causes errors.

t is non-static and it cannot be referenced in a static context in the main method.

Answer 10

t is non-static and it cannot be referenced in a static context in the main method.