DATABASE FUNDAMENTALS
BASICS OF BIG DATA
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Integer
|
|
|
Double
|
|
|
Boolean
|
|
|
Collections of Object
|
Detailed explanation-1: -1. Which of these return type of hasNext() method of an iterator? Explanation: hasNext() returns boolean values true or false.
Detailed explanation-2: -hasNext() either returns true or false while next() will actually iterate to the record. So if there are one or more records contained in your gr set, hasNext() will return true.
Detailed explanation-3: -hasNext. Returns true if the iteration has more elements. (In other words, returns true if next() would return an element rather than throwing an exception.)
Detailed explanation-4: -When the iterator is pointing at the last item in the list and calls hasNext(), it will return false since there is nothing after the last item.
Detailed explanation-5: -In JavaScript an iterator is an object which defines a sequence and potentially a return value upon its termination. Specifically, an iterator is any object which implements the Iterator protocol by having a next() method that returns an object with two properties: value. The next value in the iteration sequence.