201

Question 1

Say me PI & Exponent Constant from java.lang.Math class

Answer 1

double E

doble PI

Question 2

Why we need utilities like this Math Class?

Answer 2

As java is subjective, there are times when we do not have the time to write the implementation & at the same time to save the DRY principle, it is good to use utilities & carry our work. But we should keep practising to write utilities.

Question 3

Say the method for trigonometric functions from java.lang.Math class?

Answer 3

double sin(double a)
double cos(double a)
double tan(double a)
double asin(double a)
double acos(double a)
double atan(double a)

Question 4

What is the function for exp & log in java.lang.Math class?

Answer 4

double exp(double a)
double log(double a)

Question 5

What is the most general argument type and return type of Math class?

Answer 5

double

Question 6

What is the function for sqrt & pow in Math class?

Answer 6

double sqrt(double a)
double pow(double a, double b)

Question 7

What is the function for ceil & floor

Answer 7

double ceil(double a )
double floor(double a)

Question 8

Is there a function to generate a random int in MAth class?

Answer 8

Yes, double rint(double a)

Question 9

How can we do a round of double and float?

Answer 9

int rount(float a )
double round(double a)

Question 10

If float and double both belongs to Float type, then why we have two overloaded methods for float and double

Answer 10

TBF

Question 11

What is java.lang.StrictMath class?

Answer 11

The StringtMAth class is more standaridsed, providing more functions compare to java.lang.Math class.
In case if portability is a concern, we should use StrictMath class

Question 12

What is overflow and underflow in Math

Answer 12

TBF

Question 13

How to obtain the cuberoot in StrictMath?

Answer 13

static double cbrt(double a)

Question 14

Does many methods in StrictMath are static?

Answer 14

Yes

Question 15

How to return the hyperbolic cosine?

Answer 15

static double cosh(double a)

Question 16

What does a switch statement takes in?

Answer 16

Char, String, Integer

Question 17

Why are for each loops are used?

Answer 17

Fot each is good way where you need not to do validations for null or something. At the same time the for each works for Arrays, Collections, Enums, MAps & Properties

Question 18

For Which Operator String class is overloaded

Answer 18

+ Operator

Question 19

If you see data coming in as stream of characters what will you do?

Answer 19

It may be byte data , or stream or case of deairrializatuon

Question 20

What is 409 Conflict http code?

Answer 20

The HTTP 409 Conflict response status code indicates a request conflict with current state of the server.

Conflicts are most likely to occur in response to a PUT request. For example, you may get a 409 response when uploading a file which is older than the one already on the server resulting in a version control conflict.

Status
409 Conflict