Deck 2: Introduction to Java Applications

Question 1

Which command compiles the Java source code file Welcome.java?

A)cd Welcome.java
B)javac Welcome.java
C)java Welcome.java
D)compile Welcome.java

Answer 1

B

Question 2

Which of the following is not a Java primitive type?

A)char
B)byte
C)real
D)double

Answer 2

C

Question 3

A(n)________ enables a program to read data from the user.

A)printf.
B)import declaration.
C)Scanner.
D)main.

Answer 3

C

Question 4

Which is the output of the following statements?
System.out.print( "Hello ");
System.out.println( "World" );

A)Hello World
B)HelloWorld
C)Hello
World
D)World
Hello

Question 5

End-of-line comments that should be ignored by the compiler are denoted using

A)Two forward slashes ( // ).
B)Three forward slashes ( /// ).
C)A slash and a star ( /* ).
D)A slash and two stars ( /** ).

Question 6

All import declarations must be placed

A)inside the class declaration's body.
B)before the class declaration.
C)after the class declaration.
D)all of the above will work.

Question 7

Which of the following escape sequences represents a carriage return?

A)\n.
B)\r.
C)\cr.
D)\c.

Question 8

When method printf requires multiple arguments,the arguments are separated with ________.

A)colons (:).
B)semicolons (;).
C)commas (,).
D)periods (. ).

Question 9

Which of the following is a variable declaration statement?

A)int total;
B)import java.util.Scanner;
C)public static void main( String args[] )
D)// first string entered by user

Question 10

Which of the following is not a valid Java identifier?

A)my Value
B)$_AAA1
C)width
D)m_x

Question 11

Which of the following cannot cause a syntax error to be reported by the Java compiler?

A)Mismatched {}
B)Missing */ in a comment that begins with /*
C)Missing ;
D)An extra blank line.

Question 12

Which of the following statement displays Hello World?

A)System.out.printf( "%2s","Hello " "World" );
B)System.out.printf( "%s %s","Hello","World" );
C)System.out.printf( "%s%s","Hello,World" );
D)System.out.printf( "s% s%","Hello","World" );

Question 13

Java's predefined classes are grouped into

A)packets.
B)declarations.
C)Galleries.
D)packages.

Question 14

The filename for the public class that begins with public class Addition must be

A)public.java.
B)public.class.java.
C)Addition.java.
D)addition.java.

Question 15

Which of the following statements would display the phase Java is fun?

A)System.out.println( "hellois fun\rJava " );
B)System.out.println( 'Java is fun' );
C)System.out.println( "\"Java is fun\"" );
D)System.out.println( Java is fun );

Question 16

Which of the following statements will print a single line containing
"hello there"?

A)System.out.println( "hello" );
System.out.println( " there" );
B)System.out.println( "hello" ," there" );
C)System.out.println( "hello" );
System.out.print( " there" );
D)System.out.print( "hello" );
System.out.println( " there" );

Question 17

Which of the following is the escape character?

A)*
B)\
C)\n
D)"

Question 18

Programs remember numbers and other data in the computer's memory and access that data through program elements called

A)comments.
B)messages.
C)integers.
D)variables.

Question 19

Which of the following does not contain a syntax error?

A)System.out.println( 'Hello world!' ):
B)System.out.println( "Hello
World!" );
C)System.out.println( "Hello world!" );
D)System.out.println( Hello world! );

Question 20

Which command executes the Java class file Welcome.class?

A)java welcome
B)java Welcome.class
C)java Welcome
D)run Welcome.class

Question 21

Which of the following statements is true?

A)System.out.print("Enter your age: ");prompts the user to take action.
B)Class names typically begin with a capital letter.
C)Package java.lang is imported in every Java program.
D)All of the above are true.

Question 22

Given the Java statement
Number1 = input.nextInt();
In which number1 is an int and input is a Scanner,which of the following occurs if the user does not enter a valid int value?

A)A compilation error occurs.
B)The program continues executing and assigns the value 0 to number1.
C)A runtime logic error occurs.
D)None of the above.

Question 23

Optional parentheses in expressions are said to be

A)redundant.
B)binary operators.
C)implied.
D)declared.

Question 24

Which of the following is not an arithmetic operator?

A)+
B)-
C).
D)%

Question 25

The format specifier ________ is a placeholder for an int value.

A)%n
B)%d
C)%int
D)%s

Question 26

Which of the following statements is false?

A)Primitive types are keywords.
B)Primitive types must appear in all lowercase letters.
C)Real numbers contain decimal points.
D)Variable name identifiers must begin with a lowercase letter.

Question 27

Which of the following statements does not alter the value stored in a memory location?

A)int a;
B)number = 12;
C)y = y + 2;
D)width = Integer.parseInt(input);

Question 28

Each of the following is a relational or equality operator except:

A)<=
B)=!
C)==
D)>

Question 29

Given the Java statement
Sum = number1 + number2;
Which of the following statements is false?

A)It's an assignment statement.
B)It calculates the sum of variables number1 and number2.
C)The operands of the addition operator are number1 and number2.
D)It assigns the value of number1 to sum.

Question 30

Which of the following is not a compilation error?

A)Neglecting to initialize a local variable in a method before it is used.
B)Placing a semicolon at the end of the first line of an if statement.
C)Omitting the left and right parenthesis for the condition of an if statement.
D)All are compilation errors.

Question 31

What will be output after the following Java statements have been executed (assume all variables are of type int)?
A = 4;
B = 12;
C = 37;
D = 51;
If ( a < b )
System.out.println( "a < b" );
If ( a > b )
System.out.println( "a > b" );
If ( d <= c )
System.out.println( "d <= c" );
If ( c != d )
System.out.println( "c != d" );

A)a < b
C != d
B)a < b
D <= c
C != d
C)a > b
C != d
D)a < b
C < d
A != b

Question 32

What is the value of result after the following Java statements execute (assume all variables are of type int)?
A = 4;
B = 12;
C = 37;
D = 51;
Result = d % a * c + a % b + a;

A)119
B)51
C)127
D)59

Question 33

Portions of statements that contain calculations are called

A)variables.
B)constants.
C)expressions.
D)None of the above.

Question 34

Which of the following is a Scanner method for inputting an integer value?

A)nextInteger
B)integer
C)nextInt
D)int