M2: Getting Started with Scanner

A class for reading data from a user, String or file.

Scanner

an expression referring to input typed by a user (Standard input stream)

System.in

create a new instance (object) of the Scanner class to read input typed by a user.

new Scanner( System.in)

declaring a variable to hold the reference to an instance (object) of Scanner

Scanner input;

Creates a new instance of Scanner for reading typed user input and saves the reference in a variable named input (this doesn't actually read input but simply prepares to read input)

Scanner input = new Scanner(System.in);

calling the method nextInt() to read digits typed by the user as an int

input.nextInt()

declaring a variable named num to hold an int value.

int num;

calling a method to read an int value and then saving the value in a variable

num = input.nextInt();

A statement indicating that the program will use class Scanner found in the java.util package.

import java.util.Scanner;

call the Scanner close method when finished using the Scanner instance/object in your program

input.close();