boolean – A boolean holds one of two values, true or false. Each boolean variable occupies one byte of memory.
byte – A byte stores an 8-bit unsigned number, from 0 to 255.
int – Integers are your primary data-type for number storage.
long – Long variables are extended size variables for number storage, and store 32 bits (4 bytes), from -2,147,483,648 to 2,147,483,647.
char – A data type that takes up 1 byte of memory that stores a character value. Character literals are written in single quotes, like this: 'A' (for multiple characters - strings - use double quotes: “ABC”).