[ Java ] : Bytes to hex string

public static String bytesToHex(byte[] bytes) {

    char[] hexArray = "0123456789ABCDEF".toCharArray();

        char[] hexChars = new char[bytes.length * 3];

        for ( int j = 0; j < bytes.length; j++ ) {

            int v = bytes[j] & 0xFF;

            hexChars[j * 3] = hexArray[v >>> 4];

            hexChars[j * 3 + 1] = hexArray[v & 0x0F];

            hexChars[j * 3 + 2] = '-';

        }

        return new String(hexChars);

    }

[ Java ] : Read text file to string

source code :

    public String readFileAsString(String filePath) throws java.io.IOException

    {

        BufferedReader reader = new BufferedReader(new FileReader(filePath));

        String line, results = "";

        while( ( line = reader.readLine() ) != null)

        {

            results += line;

        }

        reader.close();

        return results;

    }

[ Java ] : check if file exist

code:

    public boolean isFileExist(String path) {

        File file = new File(path);

        if (!file.exists()) {

            return false;

        } else {

            return true;

        }

    }