java - byte z[] = new byte[5]; - What does this mean? -

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i'm trying head around piece of code found. firstly, i'm not sure why code appears like:

byte z[] = new byte[5];

instead of:

byte[] z = new byte[5];

i mean, byte z[] not there declare array of bytes? or code doing else?

secondly, why choose bytes on doubles or ints. seems byte number -128 127. what's point in choosing on double?

byte[] z equivalent byte z[] 2 different methods of represent same.

note java code conventions of sun (before becoming oracle) propose use first on second. preferreable use

byte[] z = new byte[5];

instead of

byte z[] = new byte[5];

for second part of question.

byte uses 1 byte char uses 2 bytes int  uses 4 bytes long uses 8 bytes

so best use smallest numeric type avoid memory occupancy.

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