Integer

An integer is a number that can have a plus (+) or minus (-) sign as a prefix, but this is optional. If no sign is given, it is considered as positive. You can define numeric literals in int, long, or hexadecimal form:

int numberInDec = -16;
int numberInHex = -0x10;
long numberinLong = 200L;

You can see that the first literal, -16, is a literal that's been specified in an integer variable, while the same value is assigned to an integer using a hexadecimal literal. The long variable is assigned a value with an L suffix.