I need to convert a byte array to ByteArrayOutputStream so that I can display it on screen.
3 Answers
byte[] bytes = ....;
ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length);
baos.write(bytes, 0, bytes.length);
Method description:
Writes len bytes from the specified byte array starting at offset off to this byte array output stream.
Comments
You can't display a ByteArrayOutputStream. What I suspect you are trying to do is
byte[] bytes = ...
String text = new String(bytes, "UTF-8"); // or some other encoding.
// display text.
You can make ByteArrayOutputStream do something similar but this is not obvious, efficient or best practice (as you cannot control the encoding used)
Comments
With JDK/11, you can make use of the writeBytes(byte b[]) API which eventually calls the write(b, 0, b.length) as suggested in the answer by Josh.
/**
* Writes the complete contents of the specified byte array
* to this {@code ByteArrayOutputStream}.
*
* @apiNote
* This method is equivalent to {@link #write(byte[],int,int)
* write(b, 0, b.length)}.
*
* @param b the data.
* @throws NullPointerException if {@code b} is {@code null}.
* @since 11
*/
public void writeBytes(byte b[]) {
write(b, 0, b.length);
}
The sample code would simply transform into --
byte[] bytes = new byte[100];
ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length);
baos.writeBytes(bytes);
ByteArrayOutputStreamis meant to receive data. Are you sure you don't mean aByteArrayInputStream?