The values of this word are 0 and 1. .
The word is too small for general software to calculate, so eight words are put together to form a byte.
This byte is also called bit, because in java, bits are generally not calculated, and bytes are regarded as the most basic unit of calculation.
The number of bits used in the data type is mainly for the convenience of space control.
Generally, we use variables of type int when we do plastic calculation.
Sometimes int type can't meet the calculation requirements, so use long type.
But once a long variable is declared, it will occupy 64 bytes of space forever before its life cycle ends. This is a great burden for the computer in the early morning. Therefore, different variable types are designed to facilitate programmers to control the size of the program running space.