how to compare the Java Byte[] array?

Question

public class ByteArr {

    public static void main(String[] args){
        Byte[] a = {(byte)0x03, (byte)0x00, (byte)0x00, (byte)0x00};
        Byte[] b = {(byte)0x         


        

Answer 1

why a[] doesn't equals b[]? Because equals function really called on Byte[] or byte[] is Object.equals(Object obj). This functions only compares object identify , don't compare the contents of the array.

Answer 2

There's a faster way to do that:

Arrays.hashCode(arr1) == Arrays.hashCode(arr2)

Answer 3

Java byte compare,

public static boolean equals(byte[] a, byte[] a2) {
        if (a == a2)
            return true;
        if (a == null || a2 == null)
            return false;

        int length = a.length;
        if (a2.length != length)
            return false;

        for (int i = 0; i < length; i++)
            if (a[i] != a2[i])
                return false;

        return true;
    }