Chapter 2 Introduction to Java Applications
2.2 Q1: 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 ( /** ).
2.2 Q2: Which of the following is not a valid Java identifier?
a. my Value
b. $_AAA1
c. width
d. m_x
2.2 Q3: 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.
2.2 Q4: 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! );
2.2 Q5: 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
2.2 Q6: Which command executes the Java class file Welcome.class?
a. java welcome
b. java Welcome.class
c. java Welcome
d. run Welcome.class
2.3 Q1: 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
2.3 Q2: Which of the following is the escape character?
a. *
b. \
c. \n
d. “
2.3 Q3: 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” );
2.3 Q4: Which of the following escape sequences represents a carriage return?
a. \n.
b. \r.
c. \cr.
d. \c.
2.3 Q5: 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 );
2.4 Q1: When method printf requires multiple arguments, the arguments are separated with ________.
a. colons (:).
b. semicolons (;).
c. commas (,).
d. periods (.).
2.4 Q2: 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” );
2.5 Q1: 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.
2.5.1 Q1: 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.
2.5.1 Q2: Java’s predefined classes are grouped into
a. packets.
b. declarations.
c. Galleries.
d. packages.
2.5.2 Q1: 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.
2.5.2 Q2 The body of each class declaration begins with ________ and ends with ________.
e. (, ).
f. [, ].
g. {, }.
h. /, \.
2.5.3 Q1: 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
2.5.3 Q2: A(n) ________ enables a program to read data from the user.
a. printf.
b. import declaration.
c. Scanner.
d. main.
2.5.4 Q1: Which of the following is not a Java primitive type?
a. char
b. byte
c. real
d. double
2.5.4 Q2: 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.
2.5.5 Q1: 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.
2.5.6 Q1: Which of the following is a Scanner method for inputting an integer value?
a. nextInteger
b. integer
c. nextInt
d. int
2.5.6 Q2: 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.
2.5.8 Q1: Portions of statements that contain calculations are called
a. variables.
b. constants.
c. expressions.
d. None of the above.
2.5.8 Q2: 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.
2.5.9 Q1: The format specifier ________ is a placeholder for an int value.
a. %n
b. %d
c. %int
d. %s
2.5.9 Q2: Optional parentheses in expressions are said to be
a. redundant.
b. binary operators.
c. implied.
d. declared.
2.6 Q1: 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);
2.7 Q1: 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
2.7 Q2: Which of the following is not an arithmetic operator?
a. +
b. –
c. .
d. %
2.8 Q1: 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
2.8 Q2: 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.
2.8 Q3: Each of the following is a relational or equality operator except:
a. <=
b. =!
c. ==
d. >