Summary of Java's four and eight basic data types

The first type: logical boolean

The second type: text type char

The third category: integer type (byte, short, int, long)

char type occupies 2 bytes
short from -32768 to 32767
int from -2147483648 , to 2147483647, a total of 10 digits
long from -9223372036854775808 to 9223372036854775807, a total of 19 digits

#The fourth category: floating point type ( float, double)

In mathematics, there are countless floating-point numbers from 0 to 1; and computers are discrete, so there are errors in representation. Computers use precision (a few decimal places to represent the correct number), which is more floating-point. When counting points, a==0.1 is inappropriate, it should be a-0.1==0; if a is 0.1, even if there is an error a-0.1==0 because both a and 0.1 are represented as an errory computer binary

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