#354 Fixed CheckStyle Issues

feature-toggle/src/main/java/com/iluwatar/featuretoggle/user/UserGroup.java

@@ -3,32 +3,43 @@ package com.iluwatar.featuretoggle.user;
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * Contains the lists of users of different groups paid and free
+ */
 public class UserGroup {
 
-    private static List<User> freeGroup = new ArrayList<>();
-    private static List<User> paidGroup = new ArrayList<>();
+  private static List<User> freeGroup = new ArrayList<>();
+  private static List<User> paidGroup = new ArrayList<>();
 
-    public static void addUserToFreeGroup(final User user){
-        if(paidGroup.contains(user)){
-            throw new IllegalArgumentException("User all ready member of paid group.");
-        }else{
-            if(!freeGroup.contains(user)){
-                freeGroup.add(user);
-            }
-        }
+  /**
+   *
+   * @param user {@link User} to be added to the free group
+   */
+  public static void addUserToFreeGroup(final User user) {
+    if (paidGroup.contains(user)) {
+      throw new IllegalArgumentException("User all ready member of paid group.");
+    } else {
+      if (!freeGroup.contains(user)) {
+        freeGroup.add(user);
+      }
     }
+  }
 
-    public static void addUserToPaidGroup(final User user){
-        if(freeGroup.contains(user)){
-            throw new IllegalArgumentException("User all ready member of free group.");
-        }else{
-            if(!paidGroup.contains(user)){
-                paidGroup.add(user);
-            }
-        }
+  /**
+   *
+   * @param user {@link User} to be added to the paid group
+   */
+  public static void addUserToPaidGroup(final User user) {
+    if (freeGroup.contains(user)) {
+      throw new IllegalArgumentException("User all ready member of free group.");
+    } else {
+      if (!paidGroup.contains(user)) {
+        paidGroup.add(user);
+      }
     }
+  }
 
-    public static boolean isPaid(User user) {
-        return paidGroup.contains(user);
-    }
+  public static boolean isPaid(User user) {
+    return paidGroup.contains(user);
+  }
 }