DATA TYPES, VARIABLES AND ARRAYS ONE LINER PART 2

DATA TYPES, VARIABLES AND ARRAYS ONE LINER PART 2

1) What is a string?
Ans: A combination of characters is called as string.

2) Strings are instances of the class String.
a)True         b)False
Ans: a.

3) When a string literal is used in the program, Java automatically creates instances of the string class.
a)True          

b)False
Ans: a.

4) Which operator is to create and concatenate string?
Ans: Addition operator(+).

5) Which of the following declare an array of string objects?
a)String[ ] s          

b)String [ ]s: 

c)String[ s]:               

d)String s[ ]: 

e) a, b, and d
Ans : e

6) What is the value of a[3] as the result of the following array declaration?
a)1      

b)2       

c)3           

d)4
Ans : d

7) Which of the following are primitive types?
a)byte         

b)String           

c)integer         

d)Float
Ans : a. 
 
8) What is the range of the char type?
a)0 to 216             

b)0 to 215   

c)0 to 216-1           

d)0 to 215-1
Ans. d

9) What are primitive data types?
Ans : byte, short, int, long
float, double
boolean
char

10) What are default values of different primitive types?
Ans : int - 0
short - 0
byte - 0
long - 0 l
float - 0.0 f
double - 0.0 d
boolean - false
char - null

11) Converting of primitive types to objects can be explicitly.
a)True               

b)False
Ans: b.

12) How do we change the values of the elements of the array?
Ans : The array subscript expression can be used to change the values of the elements of the array.

13) What is final varaible?
Ans : If a variable is declared as final variable, then you can not change its value. It becomes constant. 
 
14) What is static variable? 
Ans : Static variables are shared by all instances of a class.