helpers added

src/Credentials.java

 public class Credentials {
+
 }

src/Helpers.java

+import java.io.*;
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.ArrayList;
+
+public class Helpers {
+
+    // Lesen einer Textdatei in ein Stringarray
+    public static String[] readTextdatei(String name) {
+        String line;
+        ArrayList<String> result = new ArrayList<String>();
+        try {
+            FileReader fr = new FileReader(name);
+            BufferedReader br = new BufferedReader(fr);
+            while ((line = br.readLine()) != null)
+                result.add(line);
+            br.close();
+        }
+        catch (IOException e) {
+            e.printStackTrace();
+        }
+        return result.toArray(new String[]{});
+    }
+
+    // Schreiben eines Stringarray in eine Textdatei
+    public static void writeTextdatei(String name, String[] lines) {
+        try {
+            FileWriter fw = new FileWriter(name);
+            BufferedWriter bw = new BufferedWriter(fw);
+            PrintWriter pw = new PrintWriter(bw);
+            for (int i = 0; i < lines.length; i++)
+                pw.println(lines[i]);
+            pw.close();
+        }
+        catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    // Berechnen des Hashwerts zu einem String und
+    // Rückgabe als Hex-Zeichenkette
+    public static String getHash(String w) {
+        try {
+            byte[] bytesOfMessage = w.getBytes("UTF-8");
+            MessageDigest md = MessageDigest.getInstance("MD5");
+            byte[] thedigest = md.digest(bytesOfMessage);
+            return String.format("%032x", new BigInteger(1, thedigest));
+        } catch (UnsupportedEncodingException | NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+}