Java Literals MCQ Questions and Answers
1) What is Literal in Java?
A) Literal is the value that is given or assigned to a variable.
B) Literal is a data type
C) Literal is similar to String
D) None of the above
Answer [=]
A
Explanation:
Examples: 123, 45.67f, 'C', "abc", false
2) What are the types of Literals available in Java language?
A) Integer and Float
B) Character and String
C) Boolean
D) All the above
Answer [=]
D
Explanation:
Literals are Data assigned to Primitive data type variables.
3) What are the types of Integer Literals in Java?
A) Decimal Literals
B) Octal and Hexadecimal Literals
C) Binary Literals
D) All the above
Answer [=]
D
Explanation:
JDK 7 introduced binary literals to easily set individual bits of a number.
4) Choose correct examples of decimal literals in Java.
A)
int a = 12345;
B)
int a = 12_3__5;
C)
long a = 987____654_3__21L;
D) All the above
Answer [=]
D
Explanation:
To represent big numbers, simply append letter 'l' or 'L' to the number to make it a long integer. This avoids compiler errors saying "out of range"
5) An Octal number is Java is represented with a leading ____?
A) O (Alphabet)
B) 0 (ZERO)
C) 0x
D) 0X
Answer [=]
B
Explanation:
Eg. int a=0765;
6) Choose correct ranges for Decimal, Octal and Hexadecimal numbers in Java?
A) Decimal: 0 to 9
B) Octal: 0 to 7
C) Hexadecimal: 0 to 9 and A to F / a to f
D) All the above
Answer [=]
D
7) Choose the correct example of Octal Literal in Java?
A)
short = 0564;
B)
int = 076__45_2;
C)
int = 0______11;
D) All the above
Answer [=]
D
Explanation:
int = 0______11; // 8^1 * 1 + 8^0 * 1 = 9
8) What is the prefix used to represent Hexadecimal numbers in Java?
A) 0x
B) 0X
C) A and B
D) None of the above
Answer [=]
D
Explanation:
int a=0xFEB5;
int b=0X9876__45;
9) Choose correct examples of Hexadecimal literals in Java?
A)
long a = 0X987654321L;
B)
int a = 0x76FE____23;
C)
byte b = 0X0__________F;
D) All the above
Answer [=]
D
1) What is the suffix used to represent a floating point number in Java?
A) r or R
B) f or F
C) fl or FL
D) None of the above
Answer [=]
B
Explanation:
float a = 1.345f;
float b = 567.345678F;
2) What is the precision after decimal points offered by a float data type in Java?
A) 3 digits
B) 6 digits
C) 10 digits
D) 15 digits
Answer [=]
B
Explanation:
float interest = 24.123456f;
3) A real number literal for floating point literal with a missing f or F suffix represents which data type?
A) double
B) float
C) long
D) int
Answer [=]
A
Explanation:
float a = 1.23; //error
//can not convert from double to float
float b = 1.23F // works
double c = 1.567; //works
4) What is the suffix used to convert an int literal to long literal in Java?
A) 0l or 0L
B) l or L
C) i or I
D) 0x or 0X
Answer [=]
B
Explanation:
int a = 987654; //works
int b = 9876543210; //Out of range error
long c = 9876543210;//Out of range error
long d = 9876543210L; //works
5) A character literal in Java is enclosed within a pair of ___?
A) Square brackets
B) Double Quotes
C) Single Quotes
D) Exclamations
Answer [=]
C
Explanation:
char ch='A';
char ch2 = 'b';
6) Which version of Java started offering unsigned int and unsigned long to represent very long numbers?
A) JDK 5
B) JDK 6
C) JDK 7
D) JDK 8
Answer [=]
D
Explanation:
You have to use Object version of int and long namely Integer and Long to avail the feature. Using primitive data types, you can not create an unsigned int or unsigned long.
7) Choose a correct statement about Java literal types.
A) Decimal literal uses Base 10 number system.
B) Binary literal uses Base 2 number system.
C) Octal literal uses Base 8 number system.
D) All the above
Answer [=]
D
Explanation:
Hexadecimal literal uses Base 16 number system.
8) A String literal in Java is surrounded by a pair of _____?
A) Braces
B) Single Quotes
C) Double Quotes
D) Exclamations
Answer [=]
C
Explanation:
String name = "JAVA HERO";
9) Which among the following is not a primitive data type in Java?
A) char
B) String
C) byte
D) short
Answer [=]
B
Explanation:
A string is a Class that can handle a string of characters or a group of characters. If the name of the type starts with an Uppercase letter, it is a Class. So it is non-primitive.
10) Which version of Java introduced Hexadecimal floating point numbers?
A) JDK 5
B) JDK 6
C) JDK 7
D) JDK 8
Answer [=]
C
Explanation:
float a = 0x3.1p0f; // 3.0625
//3 x p0 = 3 x 2^0 = 3
//(0.1)/16 = 0.0625
11) What are the two floating point notations in Java language?
A) Exponential e or E (10^a)
B) Exponential p or P (2^a)
C) A and B
D) None of the above
Answer [=]
C
12) Choose the correct implementation of floating point literals in the exponential form in Java.
A)
float a = 12.0e2f; //1200.0
B)
float a = 100.0e-2f; // 1.0
C)
float a = 123.456e-21f;
//1.23456E-19
D) All the above
Answer [=]
D
13) Choose the correct usage of boolean literal in the options below.
A)
boolean b= false;
B)
boolean b= 2<4 p="">
//2<4 is="" p="" true="">
C)
if(true)
{ System.out.println("HELLO"); }
D) All the above
Answer [=]
D
14)
What is the output of this Java snippet?
int a = 0b111;
System.out.println(a);
A) 111
B) 7
C) 8
D) Compiler error
Answer [=]
B
Explanation:
1x2^2 + 1x2^1 + 1x2^0
1x4 + 1x2 + 1
4 + 2 + 1
15) Choose the wrong Java code statement below.
A)
boolean a = false;
B)
boolean a = (5>6)||(4>3);
C)
boolean a = 1;
D)
boolean a = 4>3?true:false;
Answer [=]
C
Explanation:
You can not assign an integer value to a boolean data type. Java does not convert integers to boolean true or false.
16) Choose the wrong Java code statement below.
A)
char a ='a';
B)
char a ="ab";
C)
char a =97;
D)
char a ='\u0123';
Answer [=]
B
Explanation:
A character variable can hold only one letter that can be represented by UTF-16 Unicode internally. Use only single quotes.
String str = "ab"; //works
17) Choose the wrong representation of a character literal in Octal notation in Java.
A)
char ch='\65';
B)
char ch='\142';
C)
char ch='\065';
D)
char ch='142';
Answer [=]
D
Explanation:
char ch='\142'; //works
char ch2 = '\97';//9 is not Octal digit
18)
A Unicode character literal in Java is surrounded by a pair of ___?
literal = \ua123
A) Single Quotes
B) Double Quotes
C) Exclamations
D) Backslashes
Answer [=]
A
Explanation:
char ch='\ua123';
19) What is the default boolean literal assigned to a boolean variable in Java?
A) true
B) false
C) undefined
D) None of the above
Answer [=]
B
Explanation:
Default values are assigned only to the instance variables.
20) What is the default character literal value assigned to a char variable in Java?
A) 'a'
B) '0'
C) '\u0000'
D) 0
Answer [=]
C
10) Binary literals in Java are introduced with which version of Java?
A) JDK 5
B) JDK 6
C) JDK 6
D) JDK 8
Answer [=]
C
11) Underscore symbols in literal numbers are introduced with which version of Java?
A) JDK 5
B) JDK 6
C) JDK 7
D) JDK 8
Answer [=]
C
12) What is the prefix used to represent Binary literals in Java?
A) b or B
B) 0b or 0B
C) xB or xb
D) ob or oB
Answer [=] B
Explanation:
ZERO B or ZERO b
byte a = 0b00001111; //15 in decimal
13) What is the correct representation of using Binary literals in Java?
A)
int a = 0b1010;
B)
int a = 0B1011_1010;
C)
int a = 0B0______________1;
D) All the above
Answer [=] D
Explanation:
int a = 0B0______________1; //decimal=1
int b = 0b1010; //decimal=10
14) What is the compiler error for improperly using Underscores ( _ ) in literals in Java?
A) Underscores are out of range
B) IllegalUnderscoresException
C) Underscores have to be located within digits
D) Too many Underscores
Answer [=] C
Explanation:
Underscore symbols cannot be used at the beginning and the end of digits of a number.
15) Choose a correct rule for using Underscores in literals of Java language.
A) Underscores cannot come at the end of a number or next to the last digit of a number.
B) Underscores cannot come at the beginning of a number or before the first digit of a number.
C) Underscores cannot come before or after a decimal point in real numbers like float and double.
D) All the above
Answer [=] D
Explanation:
Also, there is no limit on the number of underscores between digits.
16) What is the maximum number of Underscore characters that can be used in between the digits of a numeric literal in Java?
A) 8
B) 16
C) 32
D) No Limit
Answer [=] D
Explanation:
Theoretically, there is no limit on the number of underscores.
17) Java uses UTF-16 Unicode format to represent characters. What is UTF?
A) Universal Transcript Format
B) Universal Transformation Format
C) Universal Technology Format
D) None of the above
Answer [=] B
Explanation:
Unicode contains 65535 characters.
18) What is the name given to character literals in Java that start with a Back Slash character?
A) Back Slash Sequence
B) Slash Sequence
C) Escape Sequence
D) Extended Sequence
Answer [=] C
Explanation:
\b = backspace
\n = new line
\\ = backslash
19) What is the literal in Java that can be used to test whether an Object of any type is alive or not?
A) alive
B) liveof
C) null
D) 0
Answer [=] C
Explanation:
String a;
if(a==null)
System.out.println("Object destroyed");
20) What is the common UTF standard used on the Websites for information exchange?
A) UTF 16
B) UTF 8
C) UTF 32
D) None of the above
Answer [=] B
Explanation:
UTF 16 character encoding standard used by Java language is used only by the Windows internal system and JavaScript Library. Unix, Linux and MacOS use UTF-8 encoding standard.
