Browse topic-based Object Oriented System Design practice sets.
73 practice sets · Page 3 of 4
Which of the following is a Literal Representation?
100
'100'
Sample
None of the mentioned
Correct Answer: A — 100
Explanation:
A constant value in Java is created by using a 'Literal Representation' of it. Integer Literals are not enclosed in quotes where as String Literals are enclosed in quotes.
How many reserved keywords are there in Java language?
50
52
49
45
Correct Answer: A — 50
Explanation:
As of Java 1.5 there are 50 keywords out of which 48 are used(const and goto keywords are unusable keywords).
Which of these is a reserved word in Java Programming Language?
method
native
subclasses
reference
Correct Answer: B — native
Explanation:
"native" is a valid keyword used to modify method declaration. The valid keyword used in Java language for subclassing is "extends" not subclasses.
Which of these is a valid keyword in Java?
interface
string
float
unsigned
Correct Answer: A — interface
Explanation:
"String" and "Float" are class types in Java. "unsigned" is a keyword used in C/C++ but not in Java.
Which of the following is not considered as data type in Java?
String
int
boolean
double
Correct Answer: A — String
Explanation:
No explanation is available for this question yet.
What is the range of 'byte' data type?
-127 to 127
-128 to 128
-127 to 128
-128 to 127
Correct Answer: D — -128 to 127
Explanation:
No explanation is available for this question yet.
Which of the following is default value of 'double' data type?
0
0.0d
null
False
Correct Answer: B — 0.0d
Explanation:
Default value is assigned to a variable by memory when it is declared but not initialized.
Which of the following is default value of 'int' data type?
0
null
True
False
Correct Answer: A — 0
Explanation:
Default value is assigned to a variable by memory when it is declared but not initialized.
What is the range of 'short' data type?
-(2^15+1) to (2^15-1)
-2^15 to 2^15
-(2^15-1) to (2^15+1)
-(2^15-1) to 2^15
Correct Answer: D — -(2^15-1) to 2^15
Explanation:
No explanation is available for this question yet.
What is the maximum value of 'byte' data type?
2^7
2^7+1
2^7-1
None of the mentioned
Correct Answer: C — 2^7-1
Explanation:
No explanation is available for this question yet.
What is the minimum value of 'short' data type?
-32,768
-127
-2,147,483,648
-32,767
Correct Answer: A — -32,768
Explanation:
No explanation is available for this question yet.
What is the size(in bytes) of 'byte' primitive data type?
4
1
2
8
Correct Answer: B — 1
Explanation:
'byte' is a signed 8-bit(1byte) data type defined by Java.
Which of the following data type is used to fetch stream of data from network or file?
char
int
byte
double
Correct Answer: C — byte
Explanation:
When input is taken from keyboard or file it is taken in the form of bits by the machine. Byte is a collection of bits that makes user read a character at the output at a time. Usage of byte also saves memory.
Which of the following data type stores longest floating-point value?
boolean
double
float
long
Correct Answer: B — double
Explanation:
'double' is the longest data type with 64-bit defined by Java to store floating-point values.
Which of the following data type is used to create a number for counting or indexing arrays?
byte
long
int
float
Correct Answer: C — int
Explanation:
No explanation is available for this question yet.
Which of the following keyword is used to declare Byte data type?
Byte[]
BYTE
BYTES
byte
Correct Answer: D — byte
Explanation:
No explanation is available for this question yet.
Which of the following is smallest integer data type?
short
long
byte
double
Correct Answer: C — byte
Explanation:
'byte' is signed 8-bit smallest integer data type that has range from -128 to 127.
Which of following cannot be stored in character data type?
Special symbols
String
Letter
Digit
Correct Answer: B — String
Explanation:
String is a collection of characters and is stored in a variable of string data type.
Which of the following is not a primitive data type?
enum
short
byte
char
Correct Answer: A — enum
Explanation:
An 'enum' data type is special data type that enables a variable to store set of predefined constants.
Which of the following data types comes under 'Floating' data type?
float
byte
double
a and c
Correct Answer: D — a and c
Explanation:
Only 'float' and 'double' belong to floating-point numbers. 'byte' comes under 'Integer' data type.
