java - ByteBuffer.wrap came out unexpectedly -

i used bytearray create new string, results came out unexpectedly. here code

void foo(byte[] data, ...) {     bytebuffer bytebuf = bytebuffer.wrap(data, 0, 15);     string msg = new string(bytebuf.array());     log.i("foo", string.format("bytearraysize=%d\t\tmsglen=%d,%d", data.length, bytebuf.array().length, msg.length())); } 

the length of byte array 518400. log info shows:

bytearraysize=518400 msglen=518400,518400

rather than

bytearraysize=518400 msglen=15,15

what wrong?

that expected result.

according javadoc bytebuffer.wrap():

wraps byte array buffer.

the new buffer backed given byte array; is, modifications buffer cause array modified , vice versa.

and bytebuffer.array():

returns byte array backs buffer (optional operation).

modifications buffer's content cause returned array's content modified, , vice versa.

that means bytebuffer.array() return same array wrapped bytebuffer.wrap().