Answer 1

sunil vishwakarma it is known as the member access operator and is used to access functions and variables that belong to a class.
example
object.method();
calls the given method from the specified object. you have encountered this if you have ever used the method
System.out.print();
"System" is a class, "out" is an object within the class, and "print" is a method that belongs to the "out" object all connected by the DOT operator

Answer 2

Java provides many types of operators which can be used according to the need. They are classified based on the functionality they provide. 

https://www.google.co.in/amp/s/www.geeksforgeeks.org/operators-in-java/amp/

Answer 3

We can access and member and method in a class using the "." operator. You can also visit https://printerssupport.org/dell-printer-support/ to know more about the implementation of the "." operator.

Answer 4

operators are the symbols used to operate the operation like we have to do adittion so we will use "+'' sign so here "+" is operator

Answer 5

this + symbol is used in string concentration as way? but they have different functions