Learn Java with Math: Using Fun Projects and Games

© Ron Dai 2019

R. DaiLearn Java with Mathhttps://doi.org/10.1007/978-1-4842-5209-3_7

7. Input and Output

Ron Dai¹ 

(1)

Seattle, WA, USA

 

During runtime of a computer program, the program can ask the user to input data, read the user’s input, and then show the user an output result. Scanner is the tool we use to implement the user interaction feature on the console window.

Importing java.util.Scanner

The Scanner utility class and its methods have been predefined in a package. We use the import statement to integrate the Scanner class with the program we are creating.

• Approach 1. Add line import java.util.Scanner; at the top of your Java code, and then add the following in your main() class:

Scanner input = new Scanner(System.in);

• Approach 2. Type code ...