Answer:
int
int
nextInt() 
The nextInt() method of a Scanner object reads in a string of digits
(characters)
and converts them into an int type.
The Scanner object reads the characters one by one
until it has collected
those that are used for one integer.
Then it converts them into a 32-bit numeric value.
Usually that value is stored in an int variable.
The picture shows a program that reads in character data and then
converts it into an integer which is stored in num.
Next the program does arithmetic with num and
stores the result in square.
Finally the result is sent to println which converts the numeric result
into characters and prints them out.
The nextInt() method scans through the
input stream character by character, gathering characters
into a group that can be converted into numeric data.
It ignores spaces and end-of-lines that may preceed the group.
A space or end-of-line charater that follows a string of digits ends the group. A non-digit character cannot be part of a group (not even at the end.) For example,
123
and
123
are legitimate input, but
123X
is not.
Which of the following are legitimate input for nextInt() ?
4
45
456
923X
23 876