I’m trying to find an easy way to create a mutable byte array that can automatically append any primitive Java data type. I’ve been searching but could not find anything useful.
I’m looking for something like this
ByteAppender byteStructure = new ByteAppender(); byteStructure.appendInt(5); byteStructure.appendDouble(10.0); byte bytes = byteStructure.toByteArray();
ByteByffer which is great, but you have to know the size of the buffer before you start, which won’t work in my case. There is a similar thing (StringBuilder) for creating Strings, but I cannot find one for Bytes.
I thought this would be obvious in Java.
I guess you are looking for java.io.DataOutputStream
ByteArrayOutputStream out = new ByteArrayOutputStream(); DataOutputStream dout = new DataOutputStream(out); dout.writeInt(1234); dout.writeLong(123L); dout.writeFloat(1.2f); byte storingData = out.toByteArray();
How to use storingData?
//how to use storingData? ByteArrayInputStream in = new ByteArrayInputStream(storingData); DataInputStream din = new DataInputStream(in); int v1 = din.readInt();//1234 long v2 = din.readLong();//123L float v3 = din.readFloat();//1.2f