Learning immediately: https://edu.csdn.net/course/play/26302/333411?utm_source=blogtoedu
byte 1 byte 8; short, char 2 bytes 16; int float 4 bytes 32; double, long 8 bytes 64;
Therefore, 0000-0004 (excluding 0004) 4 byte, a total of 32bit, From 0008 using a label byte, with reduced integer int four bytes labeled 32, (bit: bit byte: byte)