CNIT 255 Exam 1 |114 Questions
and answers
Which describes Java?
A) Object Oriented
B) Architecture-Neutral
C) Multithreaded
D) All of the above. - -A
- Which describes the origins of Java?
A) Java was invented in in 2000.
B) Java has always been used mostly at the server level, since it could not
compete with better options for dynamic content in the browser.
C) Java was considered reasonably safe and secure, running in a limited
"sandbox."
D) Oracle, who invented Java, made sure Netscape, Internet Explorer, and
the other major browsers at the time had a unified version of Java built into
them. - -C
- How can you print the String "hello" in Java?
A) System.out.println("hello");
B) printf("hello");
C) "hello".print();
D) println("hello"): - -A
- Suppose you have a correctly written java file, "MyClass.java". When it is
compiled, what new file will be produced? - -Myclass.class
- What best describes the "String [] args" in a main() method?
A) It allows someone to pass arguments into your program when they run
your code.
,B) It explains to the compiler that your program is to be run from the
command line instead of double clicked from the desktop.
C) It defines a variable called String of type args.
D) It's not typed right and will cause a compile-time error. - -A
- Name as many floating number types in Java as you know: - -Float and
Double
- What keyword do you put in front of ints and doubles to make them
constants? - -Final
- What will the value of x be after the following expression is evaluated?
int x = 14 % 10 + ;
A) 5.25
B) 2.65
C) 5
D) 2 - -C
- Which is true of the char data type? (list all that apply)
A) It is considered one of the four "integer" variable types
B) It represents a unicode character by mapping a numerical value to a
glyph.
C) The maximum numerical value it can hold is 255.
D) char literal values are typed in java programs using double quotes (e.g.
"A")
E) Some char literal values need a slash (\) in front of them. - -B and E
- What is returned by Math.pow(3,2)
A) "bang!bang!bang! bang!bang!bang!"
B) 8
C) 9
D) 8.0
, E) 9.0 - -E
- What is printed?
int x = 0;
x += x++;
System.out.println(x); - -0
- Which conversions are "automatic"? List all that apply:
A) int => double
B) double => int
C) char => int
D) long => int
E) double => short - -A and C
- What is the output of the following code?
public class SimpleOperations
{
public static void main(String[] args)
{
double a = 10.5 % 2;
double b = 3.5 * 2;
double c = 6.;
System.out.println("a => " + a + " b => " + b + " => c " + c);
}
} - -a => 0.5 b => 7.0 => c 3.4
- What best describes a String?
A) It is a primitive variable type in Java
B) One can be created by putting it in single quotes, 'like this'
C) Strings are sequences of unicode characters.
D) You can only call a method on a String if you put it in a variable first. - -C
- What happens when the computer goes to run this line of code?
System.out.println("String".substring(2, 6)); - -(it prints "ring")
and answers
Which describes Java?
A) Object Oriented
B) Architecture-Neutral
C) Multithreaded
D) All of the above. - -A
- Which describes the origins of Java?
A) Java was invented in in 2000.
B) Java has always been used mostly at the server level, since it could not
compete with better options for dynamic content in the browser.
C) Java was considered reasonably safe and secure, running in a limited
"sandbox."
D) Oracle, who invented Java, made sure Netscape, Internet Explorer, and
the other major browsers at the time had a unified version of Java built into
them. - -C
- How can you print the String "hello" in Java?
A) System.out.println("hello");
B) printf("hello");
C) "hello".print();
D) println("hello"): - -A
- Suppose you have a correctly written java file, "MyClass.java". When it is
compiled, what new file will be produced? - -Myclass.class
- What best describes the "String [] args" in a main() method?
A) It allows someone to pass arguments into your program when they run
your code.
,B) It explains to the compiler that your program is to be run from the
command line instead of double clicked from the desktop.
C) It defines a variable called String of type args.
D) It's not typed right and will cause a compile-time error. - -A
- Name as many floating number types in Java as you know: - -Float and
Double
- What keyword do you put in front of ints and doubles to make them
constants? - -Final
- What will the value of x be after the following expression is evaluated?
int x = 14 % 10 + ;
A) 5.25
B) 2.65
C) 5
D) 2 - -C
- Which is true of the char data type? (list all that apply)
A) It is considered one of the four "integer" variable types
B) It represents a unicode character by mapping a numerical value to a
glyph.
C) The maximum numerical value it can hold is 255.
D) char literal values are typed in java programs using double quotes (e.g.
"A")
E) Some char literal values need a slash (\) in front of them. - -B and E
- What is returned by Math.pow(3,2)
A) "bang!bang!bang! bang!bang!bang!"
B) 8
C) 9
D) 8.0
, E) 9.0 - -E
- What is printed?
int x = 0;
x += x++;
System.out.println(x); - -0
- Which conversions are "automatic"? List all that apply:
A) int => double
B) double => int
C) char => int
D) long => int
E) double => short - -A and C
- What is the output of the following code?
public class SimpleOperations
{
public static void main(String[] args)
{
double a = 10.5 % 2;
double b = 3.5 * 2;
double c = 6.;
System.out.println("a => " + a + " b => " + b + " => c " + c);
}
} - -a => 0.5 b => 7.0 => c 3.4
- What best describes a String?
A) It is a primitive variable type in Java
B) One can be created by putting it in single quotes, 'like this'
C) Strings are sequences of unicode characters.
D) You can only call a method on a String if you put it in a variable first. - -C
- What happens when the computer goes to run this line of code?
System.out.println("String".substring(2, 6)); - -(it prints "ring")
