What is the purpose of long, double, byte, char in Java?

Question

So I\'m learning java, and I have a question. It seems that the types int, boolean and string will be good for just about everything I

Answer 1

You can have a look here about the primitive types in Java.

The main interest between these types are the memory usage. For example, int uses 32bits while byte only uses 8bits.

Imagine that you work on large structure (arrays, matrices...), then you will better take care of the type you are using in order to reduce the memory usage.