java - Why size of 'BigInteger' differs when saved from what 'bitLength' reports? -


i have variable named out biginteger. when trying length of variable in bits using

out.bitlength();

i receive 46.

if save in file using 

objectoutputstream oos = new objectoutputstream(new fileoutputstream("./testbig.dat")); oos.writeobject(out); oos.close();

i file 208 bytes.

can explain me why 2 values differ?

this because objectoutputstream stores objects in java's serialization format; not store raw content of biginteger object.

you can read content deserializing it, example objectinputstream.


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