• Integer types:
  byte (8) short (16) int (32) long (64)
  Suggestion: stick to int
  literals of integer types are written in the usual way as optionallyl signed strings of digits such as -356.
  
• Floating types:
  float (32), exponent +-38 or so, mantissa 7 digits or so
  double <64), exponent +-238 or so, mantissa 15 digits or so
  Problem: not currently IEEE 754 compliant
  Suggestion: stick to double
  literals of floating types are written in substantially the same ways as in other programming languages, appearance of decimal point being essential, appearance of e for exponent being optional. Examples: 0.0, 29e-3, 23.42.
• some other types:
  char - character in unicode (16) - not ascii (8)
  boolean - values are just "true" and "false"
  Suggestion: use boolean as appropriate, but almost never use the literals true and false. When you find yourself using the literal values, there is usually a better way.
• Wrappers: All these types may be capitalized. Then they become true objects consistent with the construction of complex objects in java. Suggestion: Let's use the object form except where we find some good reason not to.