Initializing byte array in java

Question

I have a below snippet which works perfectly in Grrovy, now am trying to convert it to java but am getting

protected String[] extractText(byte[] fileData) {
    //Remove the BOM if present
    if (fileData.length > 3 && fileData[0..2] == [0xEF, 0xBB, 0xBF] as byte[])
    {
      fileData = fileData[3..fileData.length-1]
    }
   // method implemaentation
}

I tried changing it as below but am getting Incompatible operand types byte and byte[] compiler error

 byte[] array= { (byte)0xEF, (byte)0xBB, (byte)0xBF };
fileData.length > 3 && fileData[0..2] == array

I've never worked with byte arrays, Could anyone please help me with this?

Your array variable is initialized properly. Now try to compare it with fileData. Please take look at: how to compare the Java Byte[] array? — wypieprz
– wypieprz, Commented Mar 25, 2015 at 18:24

chris · Accepted Answer · 2015-03-25 19:32:33Z

I used a ByteArrayInputStream and System.arraycopy to do the job:

package bom;

import java.io.ByteArrayInputStream;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Bom {

    public static void main(String[] args) {
        try {
            new Bom().go();
        } catch (Exception ex) {
            Logger.getLogger(Bom.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private void go() throws Exception {
        //create data with BOM header:
        byte[] byteArrayBom = {(byte) 0xEF, (byte) 0xBB, (byte) 0xBF, 65, 66, 67};

        ByteArrayInputStream bais = new ByteArrayInputStream(byteArrayBom);
        if (byteArrayBom.length >= 3) {
            //read the first 3 bytes to detect BOM header:
            int b00 = bais.read();
            int b01 = bais.read();
            int b02 = bais.read();
            if (b00 == 239 && b01 == 187 && b02 == 191) { 
                //BOM detected. create new byte[] for bytes without BOM:
                byte[] contentWithoutBom = new byte[byteArrayBom.length - 3];

                //copy byte array without the first 3 bytes:
                System.arraycopy(byteArrayBom, 3, contentWithoutBom, 0, byteArrayBom.length - 3);

                //let's see what we have:
                System.out.println(new String(contentWithoutBom)); //ABC

                for (int i = 0; i < contentWithoutBom.length; i++) {
                    System.out.println(contentWithoutBom[i]); //65, 66 67
                }
            }
        }
    }
}

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