Characters

Objectives

1. Examine characters in java.

Notes

• There is really no collected reference for this, sorry.
• Characters are
  • The things we can type on a keyboard
    • a-z and A-Z
    • 0-9
    • !@#...
    • And some other things as well.
  • Perhaps a better definition is anything that shows up in the ASCII character table.
    • American Standard Code for Information Interchange.
    • A table.
    • This is the way characters are stored in memory.
      • Memory can only hold "numbers"
      • So the character 'A' is represented by the number 64
      • So the character 'a' is represented by the number97
      • The character '%' is represented by the number 37
      • The character '0' is represented by the number 48
      • Be careful 0 and '0' are not the same thing.
    • ' ' is space
    • '\n' is the new line character.
  • Finally, it can be anything represented by Unicode, but we will not deal with that this semester.
• Since it is just a code, we can convert between characters and ints directly

  • char letter1 = 'a';
    char letter2 = 97;
    int code = letter;
             

  • import java.util.Scanner;
    
    public class CharDemo {
         public static void main(String[] args) {
    
            char ch = '\n';
            int code;
    
            code = ch;
            System.out.printf("'%c' has ascii code %d\n",ch,code);
         }
    }