Java Developer

1) The @Controller is a common annotation which is used to mark a class as Spring MVC Controller while the @RestController is a special controller used in RESTFul web services and the equivalent of @Controller + @ResponseBody.
 

2) The @RestController is relatively new, added only on Spring 4.0 but @Controller is an old annotation, exists since Spring started supporting annotation, and officially it was added on Spring 2.5 version.
 

3) The @Controller annotation indicates that the class is a “Controller” e.g. a web controller while the @RestController annotation indicates that the class is a controller where @RequestMapping methods assume @ResponseBody semantics by default i.e. servicing REST API.
 

4) The @Controller is a specialization of @Component annotation while @RestController is a specialization of @Controller annotation.

Algorithm :
STEP 1 : START
STEP 2 : ENTER x, y
STEP 3 : PRINT x, y
STEP 4 : x = x + y
STEP 5 : y= x - y
STEP 6 : x =x - y
STEP 7 : PRINT x, y
STEP 8 : END

The singleton pattern is a design pattern that restricts the instantiation of a class to one object. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object.
This pattern involves a single class which is responsible to create an object while making sure that only single object gets created. This class provides a way to access its only object which can be accessed directly without need to instantiate the object of the class.

Tip 1 : The cross questioning can go intense some time, think before you speak.

Tip 2 : Be open minded and answer whatever you are thinking, in these rounds I feel it is important to have opinion.

Tip 3 : Context of questions can be switched, pay attention to the details. It is okay to ask questions in these round, like what are the projects currently the company is investing, which team you are mentoring. How all is the work environment etc.