Module 3: Gathering User Input

Question 1

Scanner class

Answer 1

It is often useful to design interactive programs that read input data from the user.
The Scanner class provides convenient methods for reading input values of various types.
A scanner object can be set up to read input values from various sources, including the user typing values on the keyboard.

Question 2

How does scanner get user input?

Answer 2

You create a scanner object:
Scanner scan = new Scanner(System.in); Once created, the scanner object can be used to invoke various input method, such as:
String answer = scan.nextLine();
The nextLine method reads all of the input until the end of the line is found, and return it as one String.

Question 3

Scanner methods

Answer 3

nextInt();
nextDouble();
nextFloat();
nextLong();
nextByte();
nextShort();
next();
nextLine();

Question 4

Do you need to import Scanner?

Answer 4

Yes, it is a Class located in the Java.util package so must be imported to be used.