What´s the difference between
"hello world".getBytes("UTF-8");
and
Charset.forName("UTF-8").encode("hello world").array();
? The second code produces a byte array with 0-bytes at the end in most cases.
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1 Answer
Your second snippet uses ByteBuffer.array(), which just returns the array backing the ByteBuffer. That may well be longer than the content written to the ByteBuffer.
Basically, I would use the first approach if you want a byte[] from a String :) You could use other ways of dealing with the ByteBuffer to convert it to a byte[], but given that String.getBytes(Charset) is available and convenient, I'd just use that...
Sample code to retrieve the bytes from a ByteBuffer:
ByteBuffer buffer = Charset.forName("UTF-8").encode("hello world");
byte[] array = new byte[buffer.limit()];
buffer.get(array);
System.out.println(array.length); // 11
System.out.println(array[0]); // 104 (encoded 'h')
2 Comments
Sandeep Chatterjee
Just observed that
byte[] b1 = "hello world".getBytes("UTF-8");byte[] b2 = Charset.forName("UTF-8").encode("hello world").array();. b1.length prints out 11 and b2.length prints out 12.
Jon Skeet
@Sandeep: Yes, because the
ByteBuffer has presumably been allocated with a backing array of length 12. If you call limit() on the ByteBuffer instead, you'll just get 11 bytes...