Java Built-in Types

• Each Java variable or expression has a definite type
• Java has a collection of built-in types for integer, floating point, character, and logical data
• Each must have identical size and behavior on all Java implementations
  • No need for conditional compilation directives
• New composite types constructed in terms of built-in types, classes, arrays and interfaces
• There are 4 integer types, all with signed twos-complement values:
  • byte (8 bits)
  • short (16 bits)
  • int (32 bits)
  • long (64 bits)
  • Expressions with mixed integer types will "widen" the smaller type to the larger type