Java How to Program, Early Objects, 11th Edition

25.4 Command-Line Input in JShell

[Note: This section may be read after studying Chapter 2, Introduction to Java Applications; Input/Output and Operators and the preceding sections in this chapter.]

In Chapter 2, we showed command-line input using a Scanner object:

Scanner input = new Scanner(System.in);

System.out.print("Enter first integer: ");
int number1 = input.nextInt();

We created a Scanner, prompted the user for input, then used Scanner method nextInt to read a value. Recall that the program then waited for you to type an integer and press Enter before proceeding to the next statement. The on-screen interaction appeared as:

Enter first integer: 45

This section shows what that interaction looks like in JShell.

Creating a Scanner