Add ByteArray to integer

Question

In the following java code-snippet you'll see this line packetLengthMax += bytes.toByteArray()[43]; My question is: How does this work?

byte[] dataBuffer = new byte[265];
int packetLength = 0;
int packetLengthMax = 44;
ByteArrayOutputStream   bytes       = new ByteArrayOutputStream();
DataOutputStream        outMessage  = new DataOutputStream(bytes);
/* Client = Socket*/
DataInputStream         clientIn    = new DataInputStream(Client.getInputStream());
while (packetLength < packetLengthMax) {
    packetLength += clientIn.read(dataBuffer);
    outMessage.write(dataBuffer);           
    if (packetLength >= 43) {
        packetLengthMax += bytes.toByteArray()[43];
    }
}

My explanation: First a socket (Client) is passed to the code. Then it does the setup of all variables. In the while loop, it reads all data that comes from the socket. Then it also writes this data to the DataOutputStream. But in the if statement - it adds a byte array to an integer.
How does it work? I don't get that point. Thank you for helping!

It doesn't add a byte array, it adds the 44th value of an array — merours
– merours, Commented Feb 27, 2015 at 8:04

Nicholas Daley-Okoye · Accepted Answer · 2015-02-27 08:05:13Z

1

It's not adding the whole byte array, it's just adding the byte at position 43. (i.e. the 44th byte in the array).

answered Feb 27, 2015 at 8:05

Nicholas Daley-Okoye

2,4471 gold badge19 silver badges12 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Peter Over a year ago

Ok, I undestand that and it is the correct answer on my question. But how does that work? Adding a byte to an integer?

Nicholas Daley-Okoye Over a year ago

The only difference between byte and integer is that a byte is one byte long (-128 to 127), and an int is 4 bytes long (-2,147,483,648 to 2,147,483,647). The byte gets converted into an integer and then they are added.

Collectives™ on Stack Overflow

Add ByteArray to integer

1 Answer 1

2 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Related