Question

1-what do static, private and public modifiers do to methods and fields in java ?

2-difference between data streams and filtering streams?

3-when should an exception be thrown or catched?

Answer 1

1)

If a method or field is marked as private, then only code inside the same class can access the variable, or call the method. The Java access modifier public means that all code can access the class, field, constructor or method, regardless of where the accessing code is located.

Static access modifier links a method or field to the class rather than object of the class, which means that the static methods or fields belongs to the class and are common for all the objects.

2) Data streaming is a feature used to stream through a Collector along which you can do complex operations like filtering, etc.

3) If method can't handle the exception properly, it should be thrown. We generally throw an exception when we want to notify the caller of the method of some failures.