Basic Input

Objectives

1. Learn how to input floats and integers.

Notes

• Your author does not present the basic scanner until much later.
  • He has written his own input class.
  • This is because input is messy.
  • This is nice, but I want to stick with just java.
• I have two sources
  • Scanner Class at Oracle
  • Scanners at Javapoint..
  • Neither are great, you might want to look for other sources.
• To do input, we need to import the scanner library.
  • This is done at the top of the program with

    import java.util.Scanner; 

• Next we need a scanner,
  • This is declaring a variable to hold the scanner
  • And making a new scanner.

  • Scanner myScanner = new Scanner(System.in); 

• If you look, the scanner has many methods.
• We need two for now.
• We will look at more later.
• scanner.nextInt()
  • This will read the next integer in the input.
  • It will start by skipping white space
  • It will read an integer
  • It will stop at the next white space
  • It will return the integer read.

  • int anInt = 0;
    anInt = myScanner.nextInt(); 

  • If it does not receive an integer, the program will crash.
  • But don't worry about that for now.
• scanner.nextFloat()
  • The same as above, but for floats.