JAVA

JAVA

1. Primitives

   • Numbers: byte 8, short 16, int 32, long 64, float 32 I-EEE, double 64 I-EEE
     • int stored as binary
   • char
   • Boolean: true/false

2. Objects

   • attributes, actions, repeatable of a class

3. Variables

   • Primitive types
   • Reference type
   • Have name/identifier withProperCasing
     • no JAVA keywords, unique within scope

4. Primitive Conversion

   • change type

5. Constants

   • final boolean VARIABLES_CHANGED = false;

6. Literals

   • Primitives
     • Integer values//binary vars: 0Bbyte, 0bshort, int, long
       • Decimal.0
       • 0xHexadecimal1_000_000
       • 0567Octal
     • Floating point F_ or f_
       • whole num, dec, fractional, exp: 0.5e^10
       • float 32, double 64
     • Char
     • Boolean
   • String
   • Null

7. Operators

   • notations for operations

8. Encoding sets

   • ASCII 7 bit, 128 characters
     • Extended ASCII 8 bit, includes German and other char
   • ISO-8859-1, 8 bits, European languages
   • UNICODE, 16 bits then to 32 bits
     • UTF: 8, 16, 32 Unicode characters into variable to save data

9. Separators

   • (methods,args, loops, raise operator precedence)
   • {declarations, statement blocks, arrays}
   • [array declaration, dereferencing]
   • <pass parameter>
   • terminate statements;
   • colon: for statement over array or collection
   • separate args in declarations, or two variables
   • Separate.package.method.ref.var