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! );

Compiling and Executing Your First Java Application

2.2 Q5: Which command compiles the Java
source code fileWelcome.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 fileWelcome.class?
a. javac Welcome.class
b. java Welcome.class
c. java Welcome
d. run Welcome.class

Section 2.3 Modifying Your First Java Program
Displaying a Single Line of Text with Multiple
Statements

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

Displaying Multiple Lines of Text with a Single
Statement

2.3 Q2: Which of the following is the escape character?
a. *
b.
c. n
d. “