ASCII and Unicode

ASCII and Unicode

1. American Standard Code for Information Exchange

   • Includes Latin letters, numbers, and punctuation

2. Unicode attempts to capture every character from every language

   • Uses encoding to compress data

3. Separators

   • Include: Parentheses, braces, brackets, angle brackets, semicolon, colon, and period.

4. Primatives

   • Byte
     • 8 bit integer
   • Short
     • 16 bit integer
   • int
     • 32 bit integer
   • long
     • 64 bit integer
   • float
     • one precise floating point
   • double
     • double precision floating point
   • char
     • one Unicode character
   • boolean
     • true or false value

5. Variables

   • Two types of data
     • Reference types
       • Refers to an object
     • Primitive types
       • holds a primitive
   • Identifier
     • A name which cannot be a Java keyword
   • Names should be short and meaningful
     • Lowercase first letter with following words beginning with a capital
   • Constants
     • Variables whose value is fixed once assigned
       • Declared with the word "final"
   • Literals
     • Primitive literals
       • Integer literals
         • int x = 10
       • floating-point literals
         • Contains a whole number, a decimal point, a fractional part, and an operational exponent
       • character literals
         • "a"
       • boolean literals
         • True or false
     • String literals
     • Null literal