Java: Converting a byte array into Hexadecimal String

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I have written a method named byteArrayToHexString() which takes a byte array as parameter, and returns the Hexadecimal representation of the byte array. Below is the method.

    public static String byteArrayToHexString(byte []input){
        String string = "";
        if(input == null){
            return string;
        }
        
        for(byte b : input){
            string += Integer.toHexString(Integer.parseInt(Byte.toString(b))).toUpperCase();
        }
        
        return string;
    }