How to determine the main criteria for various primitive data types?

The main criteria for primitive data types in Java include:

• Memory size: how many bytes the type occupies (e.g., int — 4 bytes, byte — 1 byte).
• Value range: the minimum and maximum values the type can hold.
• Data type: integer (int, byte, short, long), floating-point (float, double), character (char), boolean (boolean).
• Purpose: for example, boolean for logical values, char for Unicode characters.

Example:

int a = 100; // 4 bytes, from -2_147_483_648 to 2_147_483_647
byte b = 10; // 1 byte, from -128 to 127
boolean flag = true; // logical type, true or false