Primitive Data Types:

byte: 8-bit integer (range of -128 to 127)
short: 16-bit integer (range of -32768 to 32767)
int: 32-bit integer (range of -2147483648 to 2147483647)
long: 64-bit integer (range of -9223372036854775808 to 9223372036854775807)
float: 32-bit floating point number (range of -3.4028235E38 to 3.4028235E38, with 7 digits of precision)
double: 64-bit floating point number (range of -1.7976931348623157E308 to 1.7976931348623157E308, with 15 digits of precision)
char: a single 16-bit Unicode character (range of '\u0000' to '\uffff'), use single quotes
boolean: true or false value

Reference Data Types:

String: An Object that represents a sequence of characters, use double quotes
Array: A container Object of variables that holds a fixed number of values of a single type.
and many others