Question

As we all know java allows us to use byte array as a buffer for data. My case here is with J2me

The scenario here is that I have two buffers of equal size and I need to swap them as they get full one by one ..

In detail
Two buffers buff1 and buff2

Reading data from Buff1 while writing other data to buff2

Then when buff2 gets full

They swap their position now reading from buff2 and writing to buff1

The above cycle goes on

So how do I detect when a buffer is full and is ready to be swapped?

Answer 1

so how do I detect when a buffer is full

The buffer itself is never full (or empty). It is just a fixed amount of reserved memory.

You need to keep track of the useful parts (i.e. those with meaningful data) yourself. Usually, this is just an integer that counts how much bytes were written into the buffer (starting from the beginning).

When that integer reaches the buffer length, your buffer is “full”.