How to convert large number to byte?

Question

Java

I do encryption using bit shifts in a byte. But if a byte is assigned a value greater than 127, it starts to lose data. How can I correctly convert a large number into bytes without losing data or so that it can be restored later?

Answer 1

Store a number in multiple bytes.

Answer 2

Or just use byte[]
Even with an example, you can easily convert back
https://www.tutorialspoint.com/java/math/bigintege...