Метод получение md5-hash перенесён в класс Util

src/tse/Util.java

@@ -6,6 +6,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
 import java.util.Scanner;
 import javax.imageio.ImageIO;
 
@@ -68,6 +70,24 @@ public class Util {
         if (DEBUG) ex.printStackTrace();
     }
     
+    public static String md5(String s) {
+        try {
+            MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
+            digest.update(s.getBytes());
+            byte[] messageDigest = digest.digest();
+
+            StringBuilder hexString = new StringBuilder();
+            for (int i = 0; i < messageDigest.length; i++) {
+                hexString.append(Integer.toHexString(0xFF & messageDigest[i]));
+            }
+            return hexString.toString();
+
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        }
+        return "";
+    }
+    
     private static InputStream getInputStream(String resource) {
         return Runtime.getRuntime().getClass().getResourceAsStream(resource);
     }

src/tse/lr4/LoginPanel.java

@@ -12,6 +12,7 @@ import javax.swing.JTextField;
 import javax.swing.SwingConstants;
 import org.netbeans.lib.awtextra.AbsoluteConstraints;
 import org.netbeans.lib.awtextra.AbsoluteLayout;
+import tse.Util;
 
 /**
  * Панель авторизации.
@@ -147,7 +148,7 @@ public class LoginPanel extends JPanel {
     }
     
     private void registerNewAccount(String user, String pass) {
-        String md5hash = Utils.md5(pass);
+        String md5hash = Util.md5(pass);
         AccountManager.getInstance().createNewAccount(user, md5hash);
     }
     
@@ -163,7 +164,7 @@ public class LoginPanel extends JPanel {
             return;
         }
         
-        String md5hash = Utils.md5(pass);
+        String md5hash = Util.md5(pass);
         switch(AccountManager.getInstance().checkAuth(login, md5hash)) {
             case AccountManager.STATE_ACCOUNT_NOT_EXISTS:
                 JOptionPane.showMessageDialog(this, "Пользователя с таким именем не существует", "Ошибка", JOptionPane.ERROR_MESSAGE);

src/tse/lr4/Utils.java

@@ -1,29 +0,0 @@
-package tse.lr4;
-
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-
-/**
- *
- * @author aNNiMON
- */
-public class Utils {
-
-    public static String md5(String s) {
-        try {
-            MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
-            digest.update(s.getBytes());
-            byte[] messageDigest = digest.digest();
-
-            StringBuilder hexString = new StringBuilder();
-            for (int i = 0; i < messageDigest.length; i++) {
-                hexString.append(Integer.toHexString(0xFF & messageDigest[i]));
-            }
-            return hexString.toString();
-
-        } catch (NoSuchAlgorithmException e) {
-            e.printStackTrace();
-        }
-        return "";
-    }
-}