Deck 2: Java Fundamentals

Question 1

What is the result of the following expression? 10 + 5 * 3 - 20

A) -5
B) 5
C) 25
D) -50

Answer 1

B

Question 2

Character literals are enclosed in _____;string literals are enclosed in _____.

A) single quotes;single quotes
B) double quotes;double quotes
C) single quotes;double quotes
D) double quotes;single quotes

Answer 2

C

Question 3

Which of the following is not a primitive data type?

A) short
B) long
C) float
D) String

Answer 3

D

Question 4

A Java program must have at least one of these:

A) Class definition
B) Variable
C) Comment
D) System.out.println();statement

Question 5

What is the result of the following expression? 25 / 4 + 4 * 10 % 3

A) 19
B) 5.25
C) 3
D) 7

Question 6

The ___________ is normally considered the standard output and standard input devices,and usually refer to the monitor and keyboard.

A) CRT
B) CPU
C) secondary storage devices
D) console

Question 7

What will be displayed as a result of executing the following code? int x = 6;
String msg = "I am enjoying this class.";
String msg1 = msg.toUpperCase();
String msg2 = msg.toLowerCase();
Char ltr = msg.charAt(x);
Int strSize = msg.length();
System.out.println(msg);
System.out.println(msg1);
System.out.println(msg2);
System.out.println("Character at index x = " +
Ltr);
System.out.println("msg has " + strSize +
"characters.");

A) I am enjoying this class.
I AM ENJOYING THIS CLASS.
I am enjoying this class.
Character at index x = e
Msg has 24 characters.
B) I am enjoying this class.
I AM ENJOYING THIS CLASS.
I am enjoying this class.
Character at index x = e
Msg has 25 characters.
C) I am enjoying this class.
I AM ENJOYING THIS CLASS.
I am enjoying this class.
Character at index x = n
Msg has 24 characters.
D) I am enjoying this class.
I AM ENJOYING THIS CLASS.
I am enjoying this class.
Character at index x = n
Msg has 25characters.

Question 8

What will be displayed as a result of executing the following code? int x = 5,y = 20;
X += 32;
Y /= 4;
System.out.println("x = " + x + ",y = " + y);

A) x = 32,y = 4
B) x = 9,y = 52
C) x = 37,y = 5
D) x = 160,y = 80

Question 9

Which of the following is valid?

A) float y;
Y = 54.9;
B) float y;
Double z;
Z = 934.21;
Y = z;
C) float w;
W = 1.0f;
D) float v;
V = 1.0;

Question 10

In the following Java statement what value is stored in the variable name? String name = "John Doe";

A) John Doe
B) The memory address where "John Doe" is located
C) name
D) The memory address where name is located

Question 11

Which of the following is not a valid comment statement?

A) // comment 1
B) /* comment 2 */
C) */ comment 3 /*
D) /** comment 4 */

Question 12

If the following Java statements are executed,what will be displayed? System.out.println("The top three winners are \ n");
System.out.print("Jody,the Giant \ n");
System.out.print("Buffy,the Barbarian");
System.out.println("Adelle,the Alligator");

A) The top three winners are
Jody,the Giant
Buffy,the Barbarian
Adelle,the Alligator
B) The top three winners are
Jody,the Giant \ nBuffy,the BarbarianAdelle,the Alligator
C) The top three winners are Jody,the Giant \ nBuffy,the BarbarianAdelle,and the Albino
D) The top three winners are
Jody,the Giant
Buffy,the BarbarianAdelle,the Alligator

Question 13

The boolean data type may contain values in the following range of values

A) true or false
B) -128 to + 127
C) - 2,147,483,648 to +2,147,483,647
D) - 32,768 to +32,767

Question 14

What will be the value of z as a result of executing the following code? int x = 5,y = 28;
Float z;
Z = (float)(y / x);

A) 5.60
B) 5.6
C) 3.0
D) 5.0

Question 15

To compile a program named First,use the following command

A) java First.java
B) javac First
C) javac First.java
D) compile First.javac

Question 16

What would be printed out as a result of the following code? System.out.println("The quick brown fox" +
"jumped over the \ n"
"slow moving hen.");

A) The quick brown fox jumped over the \ nslow moving hen.
B) The quick brown fox jumped over the
Slow moving hen.
C) The quick brown fox
Jumped over the
Slow moving hen.
D) Nothing.This is an error.

Question 17

Which of the following is not a rule that must be followed when naming identifiers?

A) The first character must be one of the letters a-z,A-Z,and underscore or a dollar sign.
B) Identifiers can contain spaces.
C) Uppercase and lowercase characters are distinct.
D) After the first character,you may use the letters a-z,A-Z,the underscore,a dollar sign,or digits 0-9.

Question 18

What will be the displayed when the following code is executed? final int x = 22,y = 4;
Y += x;
System.out.println("x = " + x +
",y = " + y);

A) x = 22,y = 4
B) x = 22,y = 26
C) x = 22,y = 88
D) Nothing,this is an error

Question 19

This is a value that is written into the code of a program.

A) literal
B) assignment statement
C) variable
D) operator

Question 20

What will be displayed as a result of executing the following code? public class test
{
Public static void main(String[] args)
{
Int value1 = 9;
System.out.println(value1);
Int value2 = 45;
System.out.println(value2);
System.out.println(value3);
Value = 16;
}
}

A) 9
45
16
B) 94516
C) 9 45 16
D) Nothing,this is an error

Question 21

To print "Hello,world" on the monitor,use the following Java statement

A) SystemOutPrintln("Hello,world");
B) System.out.println{"Hello,world"}
C) System.out.println("Hello,world");
D) Print "Hello,world";

Question 22

Given the declaration double r;,which of the following statements is invalid?

A) r = 326.75;
B) r = 9.4632e15;
C) r = 9.4632E15;
D) r = 2.9X106;

Question 23

What will be displayed after the following statements have been executed? final double x;
X = 54.3;
System.out.println("x = " + x );

A) x = 54.3
B) x
C) x = 108.6
D) Nothing,this is an error.

Question 24

This is a named storage location in the computer's memory.

A) Literal
B) Constant
C) Variable
D) Operator

Question 25

What is the result of the following expression? 17 % 3 * 2 - 12 + 15

A) 7
B) 8
C) 12
D) 105

Question 26

Variables are classified according to their

A) value
B) data type
C) names
D) location in the program

Question 27

What would be displayed as a result of the following code? int x = 578;
System.out.print("There are " +
X + 5 + " \ n" +
"hens in the hen house.");

A) There are 583 hens in the hen house.
B) There are 5785 hens in the hen house.
C) There are x5 \ nhens in the hen house.
D) There are 5785
Hens in the hen house.

Question 28

The primitive data types only allow a(n)_____ to hold a single value.

A) variable
B) object
C) class
D) literal

Question 29

This is a variable whose content is read only and cannot be changed during the program's execution.

A) operator
B) literal
C) named constant
D) reserved word

Question 30

What will be the value of z after the following statements have been executed? int x = 4,y = 33;
Double z;
Z = (double)(y / x);

A) 8.25
B) 4
C) 8
D) 8.0

Question 31

Variables of the boolean data type are useful for

A) working with small integers
B) evaluating true/false conditions
C) working with very large integers
D) evaluating scientific notation

Question 32

If x has been declared an int,which of the following statements is invalid?

A) x = 0;
B) x = -58932;
C) x = 1,000;
D) x = 592;

Question 33

To display the output on the next line,you can use the println method or use this escape sequence in the print method.

A) \ n
B) \ r
C) \ t
D) \ b

Question 34

Which of the following does not describe a valid comment in Java?

A) Single line comments,two forward slashes - //
B) Multi-line comments,start with /* and end with */
C) Multi-line comments,start with */ and end with /*
D) Documentation comments,any comments starting with /** and ending with */

Question 35

What will be displayed after the following statements have been executed? int x = 15,y = 20,z = 32;
X += 12;
Y /= 6;
Z -= 14;
System.out.println("x = " + x +
",y = " + y +
",z = " +z);

A) x = 27,y = 3.333,z = 18
B) x = 27,y = 2,z = 18
C) x = 27,y = 3,z = 18
D) x = 37,y = 14,z = 4

Question 36

What is the result of the following expression? 25 - 7 * 3 + 12 / 3

A) 6
B) 8
C) 10
D) 12

Question 37

Every Java application program must have

A) a class named MAIN
B) a method named main
C) comments
D) integer variables

Question 38

When saving a Java source file,save it with an extension of

A) .javac
B) .class
C) .src
D) .java

Question 39

Which of the following is a valid Java statement?

A) String str = 'John Doe';
B) string str = "John Doe";
C) string str = 'John Doe';
D) String str = "John Doe";

Question 40

What will be displayed as a result of executing the following code? int x = 8;
String msg = "I am enjoying java.";
String msg1 = msg.toUpperCase();
String msg2 = msg.toLowerCase();
Char ltr = msg.charAt(x);
Int strSize = msg.length();
System.out.println(msg);
System.out.println(msg1);
System.out.println(msg2);
System.out.println("Character at index x = " +
Ltr);
System.out.println("msg has " + strSize +
" characters.");

A) I am enjoying java.
I AM ENJOYING JAVA.
I am enjoying java.
Character at index x = j
Msg has 20 characters.
B) I am enjoying java.
I AM ENJOYING JAVA.
I am enjoying java.
Character at index x = o
Msg has 20 characters.
C) I am enjoying java.
I AM ENJOYING JAVA.
I am enjoying java.
Character at index x = o
Msg has 19 characters.
D) I am enjoying java.
I AM ENJOYING JAVA.
I am enjoying java.
Character at index x = y
Msg has 19 characters.

Question 41

A variable's scope is the part of the program that has access to the variable.

Question 42

Which of the following statements correctly creates a Scanner object for keyboard input?

A) Scanner kbd = new Scanner(System.keyboard);
B) Scanner keyboard(System.in);
C) Scanner keyboard = new Scanner(System.in);
D) Keyboard scanner = new Keyboard(System.in);

Question 43

Which Scanner class method reads an int?

A) readInt()
B) nextInt()
C) getInt()
D) read_int()

Question 44

Programming style includes techniques for consistently putting spaces and indentation in a program so visual cues are created.

Question 45

If the compiler encounters a statement that uses a variable before the variable is declared,an error will result.

Question 46

All Java statements end with semicolons.

Question 47

Assuming that pay has been declared a double,the following statement is valid.
pay = 2,583.44;

Question 48

Both character literals and string literals can be assigned to a char variable.

Question 49

Class names and key words are examples of variables.

Question 50

Although the dollar sign is a legal identifier character,you should not use it because it is normally used for special purposes.

Question 51

In Java the variable named one is the same as the variable named One.

Question 52

Named constants are initialized with a value,that value cannot be changed during the execution of the program.

Question 53

Which Scanner class method reads a String?

A) readString()
B) nextString()
C) getString()
D) nextLine()