Kommentare 2: electric boogaloo

src/main/java/com/bib/essensbestellungsverwaltung/AccountMgr.java

@@ -1,7 +1,4 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
 import javax.crypto.SecretKeyFactory;
 import javax.crypto.spec.PBEKeySpec;
@@ -13,12 +10,18 @@ import java.util.ArrayList;
 import java.util.Base64;
 import java.util.List;
 
+/**
+ * A collection of functions loosely related to account management
+ * Acts as an abstraction layer to the database
+ * @author Malte Schulze Hobeling
+ */
 public class AccountMgr {
-    protected static double price = 5.0;
 
     /**
      * creates a user with createUser(...) and adds its id to the 'worker' table
+     * @param worker the worker to be created
      * @return userid or -1
+     * @author Malte Schulze Hobeling
      */
     protected static long createWorker(Worker worker){
         long id = createUser(worker);
@@ -29,7 +32,9 @@ public class AccountMgr {
 
     /**
      * creates a user with createUser(...) and adds its id to the 'parent' table
+     * @param parent the parent to be created
      * @return userid or -1
+     * @author Malte Schulze Hobeling
      */
     protected static long createParent(Parent parent){
         long id = createUser(parent);
@@ -40,7 +45,9 @@ public class AccountMgr {
 
     /**
      * adds a user to the database
+     * @param user the user to be created
      * @return userid or -1
+     * @author Malte Schulze Hobeling
      */
     protected static long createUser(User user) {
         String[] userH = {"name", "firstname", "addressid", "password", "email"};
@@ -56,6 +63,12 @@ public class AccountMgr {
         return Database.insert("user", userH, userD);
     }
 
+    /**
+     * adds an address to the database
+     * @param address the address to be created
+     * @return id or -1
+     * @author Malte Schulze Hobeling
+     */
     protected static long createAddress(Address address){
         String[] addressH = {"street", "number", "plz", "city"};
         String[] addressD = {address.getStreet(),address.getNumber(),address.getPlz(),address.getCity()};
@@ -64,7 +77,9 @@ public class AccountMgr {
 
     /**
      * adds a child and allergies to the database
+     * @param child the child to be created
      * @return id of child or -1
+     * @author Malte Schulze Hobeling
      */
     protected static long createChild(Child child){
         String[] childH = {"name","firstname","addressid"};
@@ -81,8 +96,17 @@ public class AccountMgr {
         return id;
     }
 
+    /**
+     * returns a User(Worker | Parent) for a given id or null if no unique id was found
+     * @param id id of the User
+     * @return User(Worker | Parent) or null
+     * @author Malte Schulze Hobeling
+     */
     protected static User getUserById(long id){
         List<String> entry = Database.getEntryById("user",id);
+        if(entry.size() != 1){
+            return null;
+        }
         String[] parts = entry.get(0).split(":");
         Address address = getAddressById(id);
         if(isWorker(String.valueOf(id))){
@@ -100,8 +124,17 @@ public class AccountMgr {
         }
     }
 
+    /**
+     * returns a Child for a given id or null if no unique id was found
+     * @param id id of child
+     * @return Child or null
+     * @author Malte Schulze Hobeling
+     */
     protected static Child getChildById(long id){
         List<String> entry = Database.getEntryById("child",id);
+        if(entry.size() != 1){
+            return null;
+        }
         String[] parts = entry.get(0).split(":");
         String[] child_allergyH = {"childid"};
         String[] child_allergyD = {String.valueOf(id)};
@@ -117,8 +150,17 @@ public class AccountMgr {
         return new Child(id,parts[1],parts[2],getAddressById(Long.parseLong(parts[3])),allergySeverities);
     }
 
+    /**
+     * returns an Address for a given id or null if no unique id was found
+     * @param id id of the address
+     * @return Address or null
+     * @author Malte Schulze Hobeling
+     */
     protected static Address getAddressById(long id){
         List<String> entry = Database.getEntryById("address",id);
+        if(entry.size() != 1){
+            return null;
+        }
         String[] parts = entry.get(0).split(":");
         return new Address(Long.parseLong(parts[0]),parts[1],parts[2],parts[3],parts[4]);
     }
@@ -128,6 +170,7 @@ public class AccountMgr {
      * @param parentId id of parent
      * @param childId id of child
      * @return id of parent_child or -1
+     * @author Malte Schulze Hobeling
      */
     protected static long matchParentChild(String parentId, String childId){
         String[] parent_childH = {"parentuserid","childid"};
@@ -140,6 +183,7 @@ public class AccountMgr {
      * @param email email
      * @param pw password
      * @return id or -1
+     * @author Malte Schulze Hobeling
      */
     protected static long login(String email, String pw){
         String[] pwH = {"email"};
@@ -163,6 +207,7 @@ public class AccountMgr {
      * checks if id is in worker table
      * @param id userid
      * @return true if id is in worker table
+     * @author Malte Schulze Hobeling
      */
     protected static boolean isWorker(String id){
         String[] workerH = {"userid"};
@@ -175,6 +220,7 @@ public class AccountMgr {
      * checks if id is in parent table
      * @param id userid
      * @return true if id is in parent table
+     * @author Malte Schulze Hobeling
      */
     protected static boolean isParent(String id){
         String[] parentH = {"userid"};
@@ -187,6 +233,7 @@ public class AccountMgr {
      * returns a hashed and salted password
      * @param pw the password to hash
      * @return hashed and salted password
+     * @author Malte Schulze Hobeling
      */
     private static String hashAndSalt(String pw, String salt){
         Base64.Decoder dec = Base64.getDecoder();
@@ -205,6 +252,11 @@ public class AccountMgr {
         return hashedPw;
     }
 
+    /**
+     * generates a secure random salt, Base64 encoded
+     * @return String Base64 encoded
+     * @author Malte Schulze Hobeling
+     */
     private static String getSalt(){
         SecureRandom sec = new SecureRandom();
         byte[] salt = new byte[16];
@@ -218,11 +270,15 @@ public class AccountMgr {
      * @param date YYYY-MM the month
      * @param childId id of child
      * @return the invoice as a List
+     * @author Malte Schulze Hobeling
      */
     protected static List<String> getInvoice(String date, String childId){
         List<String> invoice = new ArrayList<>();
-        invoice.add("Monatsabrechnung " + date);
         List<String> child = Database.getEntryById("child", Long.parseLong(childId));
+        if(child.size() != 1){
+            return invoice;
+        }
+        invoice.add("Monatsabrechnung " + date);
         String[] childParts = child.get(0).split(":");
         invoice.add(childParts[1] + ", " + childParts[2]);
         String[] food_planH = {"date"};
@@ -241,18 +297,29 @@ public class AccountMgr {
                 invoice.add(line);
             }
         }
+        double price = getPrice();
         invoice.add("Total: " + (invoice.size()-2) + " X " + price + "€ = " + ((invoice.size()-2)*price) + "€");
         return invoice;
     }
 
-    protected static void getPriceFromDb(){
+    /**
+     * gets the price per meal from the database and converts it to double
+     * @return double price
+     * @author Malte Schulze Hobeling
+     */
+    protected static double getPrice(){
         List<String> priceEntry = Database.getEntryById("price",1);
-        price = Double.parseDouble(priceEntry.get(0).split(":")[1])/100.0;
+        return Double.parseDouble(priceEntry.get(0).split(":")[1])/100.0;
     }
 
-    protected static void setPriceInDb(){
+    /**
+     * converts the price per meal to integer and updates it in the database
+     * @param price double
+     * @author Malte Schulze Hobeling
+     */
+    protected static void setPrice(double price){
         String[] priceH = {"id","price"};
-        String[] priceD = {"1", String.valueOf(price*100)};
+        String[] priceD = {"1", String.valueOf((int)(price*100))};
         Database.update("price",priceH,priceD);
     }
 }

src/main/java/com/bib/essensbestellungsverwaltung/Address.java

@@ -1,8 +1,10 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
+/**
+ * An Address, used by User and Child and intended as a way to identify a child if you want to match it to another parent
+ * one constructor is used for creating new addresses the other is used to create existing addresses from database
+ * @author Malte Schulze Hobeling
+ */
 public class Address {
     private long id;
     private String street;

src/main/java/com/bib/essensbestellungsverwaltung/Allergy.java

@@ -1,8 +1,9 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
+/**
+ * An Allergy, used by Food and AllergySeverity, not intended to be changed
+ * @author Malte Schulze Hobeling
+ */
 public class Allergy {
     private final long id;
     private final String name;

src/main/java/com/bib/essensbestellungsverwaltung/AllergySeverity.java

@@ -1,8 +1,9 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
+/**
+ * Matching an Allergy to a Severity, used by Child
+ * @author Malte Schulze Hobeling
+ */
 public class AllergySeverity {
     private Allergy allergy;
     private long severityId;

src/main/java/com/bib/essensbestellungsverwaltung/Child.java

@@ -1,10 +1,12 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
 import java.util.List;
 
+/**
+ * A Child, used by Parent
+ * one constructor is used to create new children the other is used to create existing children from database
+ * @author Malte Schulze Hobeling
+ */
 public class Child {
     private long id;
     private String name;

src/main/java/com/bib/essensbestellungsverwaltung/ConsoleLib.java

@@ -1,12 +1,13 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Scanner;
 
+/**
+ * library for cli functions
+ * @author Malte Schulze Hobeling
+ */
 public class ConsoleLib {
     public static void createWorkerPrompt(){
         Scanner sc = new Scanner(System.in);
@@ -320,7 +321,6 @@ public class ConsoleLib {
         Scanner sc = new Scanner(System.in);
         double price = sc.nextDouble();
         sc.nextLine();
-        AccountMgr.price = price;
-        AccountMgr.setPriceInDb();
+        AccountMgr.setPrice(price);
     }
 }

src/main/java/com/bib/essensbestellungsverwaltung/ConsoleMain.java

@@ -1,10 +1,11 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
 import java.util.Scanner;
 
+/**
+ * simple cli showcase of the implemented functionality
+ * @author Malte Schulze Hobeling
+ */
 public class ConsoleMain {
     static User currentUser = null;
     static boolean running = true;
@@ -15,7 +16,7 @@ public class ConsoleMain {
             Database.fillDb();
             ConsoleLib.createWorkerPrompt();
         }
-        AccountMgr.getPriceFromDb();
+        AccountMgr.getPrice();
         while (running){
             if(currentUser == null){
                 defaultMenu();

src/main/java/com/bib/essensbestellungsverwaltung/Database.java

@@ -1,7 +1,4 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
 import java.io.File;
 import java.io.IOException;
@@ -10,13 +7,19 @@ import java.sql.*;
 import java.util.ArrayList;
 import java.util.List;
 
-
+/**
+ * Basic operations on the database
+ * Use init() -> createDb() -> fillDb() to create the skeleton with some default values
+ * Provides select, insert, update, delete, count operations and more
+ * @author Malte Schulze Hobeling
+ */
 public class Database {
     private static final String dbLocation = "jdbc:sqlite:"+Path.of("").toAbsolutePath()+"/database.db";
 
     /**
      * creates new database.db if it doesn't exist
      * @return true if a new database has been created
+     * @author Malte Schulze Hobeling
      */
     protected static boolean init(){
         File db = new File(Path.of("").toAbsolutePath()+"/database.db");
@@ -30,6 +33,7 @@ public class Database {
     /**
      * connects to the database
      * @return Connection to the database
+     * @author Malte Schulze Hobeling
      */
     protected static Connection connect(){
         Connection conn = null;
@@ -43,6 +47,7 @@ public class Database {
 
     /**
      * creates the initial structure of the db
+     * @author Malte Schulze Hobeling
      */
     protected static void createDb(){
         String[] sql = new String[15];
@@ -173,6 +178,7 @@ public class Database {
 
     /**
      * inserts fixed values into the database
+     * @author Malte Schulze Hobeling
      */
     protected static void fillDb(){
         List<String> sqls = new ArrayList<>();
@@ -274,11 +280,12 @@ public class Database {
 
     /**
      * inserts data into table and returns its id
-     * does not insert if the exact set already exists
+     * simple duplication check
      * @param table name of the database table
      * @param header String[] order should match with values
      * @param values String[] order should match with header
      * @return id of dataset or -1
+     * @author Malte Schulze Hobeling
      */
     protected static long insert(String table, String[] header, String[] values){
         long id = -1;
@@ -320,6 +327,7 @@ public class Database {
      * @param header the header of the table, order should match with values
      * @param values the data you want the id of, order should match witch values
      * @return one id matching the given data or -1 if no match has been found
+     * @author Malte Schulze Hobeling
      */
     protected static long getSingleId(String table, String[] header, String[] values){
         long id = -1;
@@ -372,6 +380,7 @@ public class Database {
      * deletes an entry from table with matching id
      * @param table the table that contains the entry you want to delete
      * @param id the id of the entry you want to delete
+     * @author Malte Schulze Hobeling
      */
     protected static void delete(String table, long id){
         String sql = "DELETE FROM " + table + " WHERE id = ?;";
@@ -383,6 +392,21 @@ public class Database {
         }
     }
 
+    /**
+     * its a query builder it builds queries
+     * exists:       checks if an entry with the given parameters exists in table
+     * selectMatch:  returns all matching rows from table
+     * insert:       inserts or ignores into table
+     * count:        counts exact matches from table
+     * update:       updates table, header/values[0] is used as WHERE, using id is recommended header/values[1+] are used
+     *               as SET
+     * @param type exists, selectMatch, insert, count, update
+     * @param table table
+     * @param header header
+     * @param values values
+     * @return sql statement as String
+     * @author Malte Schulze Hobeling
+     */
     private static String queryBuilder(String type,String table, String[] header, String[] values){
         String sql;
         StringBuilder sb = new StringBuilder();
@@ -479,6 +503,7 @@ public class Database {
      * returns a list of all entries
      * @param table the table you want
      * @return a list of all entries as String with the fields separated by ":"
+     * @author Malte Schulze Hobeling
      */
     protected static List<String> getTable(String table){
         List<String> data = new ArrayList<>();
@@ -510,6 +535,7 @@ public class Database {
      * @param header header for the WHERE portion, order should match with values
      * @param values values for the WHERE portion, order should match with header
      * @return a list of the matching data as String separated by ":"
+     * @author Malte Schulze Hobeling
      */
     protected static List<String> select(String table,String[] header, String[] values){
         List<String> data = new ArrayList<>();
@@ -541,6 +567,7 @@ public class Database {
      * @param table the table you want the entry from
      * @param id the id of the entry you want
      * @return a list of String separated by ":"
+     * @author Malte Schulze Hobeling
      */
     protected static List<String> getEntryById(String table, long id){
         List<String> data = new ArrayList<>();
@@ -574,6 +601,7 @@ public class Database {
      * @param header the properties you want to count on
      * @param values the values for the properties
      * @return the number of found rows
+     * @author Malte Schulze Hobeling
      */
     protected static int count(String table,String[] header,String[] values){
         String sql = queryBuilder("count",table,header,values);
@@ -592,6 +620,7 @@ public class Database {
      * @param header [0] is used as WHERE, everything else in SET
      * @param values [0] is used as WHERE, everything else in SET
      * @return number of rows affected or -1 on error
+     * @author Malte Schulze Hobeling
      */
     protected static int update(String table,String[] header,String[] values){
         try(Connection conn = connect()) {

src/main/java/com/bib/essensbestellungsverwaltung/Food.java

@@ -1,10 +1,12 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
 import java.util.List;
 
+/**
+ * Food, used by FoodPlan
+ * one constructor is used to create new foods the other is used to create existing foods from database
+ * @author Malte Schulze Hobeling
+ */
 public class Food {
     private long id;
     private String name;

src/main/java/com/bib/essensbestellungsverwaltung/FoodMgr.java

@@ -1,16 +1,19 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
 import java.util.ArrayList;
 import java.util.List;
 
-
+/**
+ * A collection of functions loosely related to food management
+ * Acts as an abstraction layer to the database
+ * @author Malte Schulze Hobeling
+ */
 public class FoodMgr {
     /**
      * inserts a food int to the database and creates the food_restriction entries
+     * @param food the food to be created
      * @return id of food or -1
+     * @author Malte Schulze Hobeling
      */
     public static long createFood(Food food){
         String[] foodH = {"name","description","isDessert","food_typeid"};
@@ -29,7 +32,9 @@ public class FoodMgr {
 
     /**
      * inserts a food_plan into the database
+     * @param foodPlan the foodPlan to be created
      * @return id of food_plan or -1
+     * @author Malte Schulze Hobeling
      */
     public static long createFood_plan(FoodPlan foodPlan){
         String[] food_planH = {"date","food1","food2","dessert1","dessert2"};
@@ -59,6 +64,7 @@ public class FoodMgr {
      * returns all non desserts or all desserts
      * @param isDessert true for only desserts false for non desserts
      * @return a list of all non desserts or all desserts
+     * @author Malte Schulze Hobeling
      */
     public static List<Food> getFood(boolean isDessert){
         String[] foodH = {"isDessert"};
@@ -76,6 +82,7 @@ public class FoodMgr {
      * getFood but returns only vegan food
      * @param isDessert true for only desserts false for non desserts
      * @return a list of all vegan non desserts or all vegan desserts
+     * @author Malte Schulze Hobeling
      */
     public static List<Food> getVeganFood(boolean isDessert){
         String[] foodH = {"isDessert","food_typeid"};
@@ -93,6 +100,7 @@ public class FoodMgr {
      * returns a food_plan for a day
      * @param date YYYY-MM-DD one day
      * @return food_plan for date
+     * @author Malte Schulze Hobeling
      */
     public static FoodPlan getFoodPlan(String date){
         String[] food_planH = {"date"};
@@ -110,8 +118,17 @@ public class FoodMgr {
         return new FoodPlan(Long.parseLong(parts[0]),date,foodVegan,foodSecond,dessertVegan,dessertSecond,isSent);
     }
 
+    /**
+     * returns a FoodPlan for a given id or null if no unique id was found
+     * @param id id of the FoodPlan
+     * @return FoodPlan or null
+     * @author Malte Schulze Hobeling
+     */
     public static FoodPlan getFoodPlanById(long id){
         List<String> entry = Database.getEntryById("food_plan",id);
+        if(entry.size() != 1){
+            return null;
+        }
         String[] parts = entry.get(0).split(":");
         Food foodVegan = getFoodById(Long.parseLong(parts[2]));
         Food foodSecond = getFoodById(Long.parseLong(parts[3]));
@@ -121,8 +138,17 @@ public class FoodMgr {
         return new FoodPlan(id,parts[1], foodVegan,foodSecond,dessertVegan,dessertSecond,isSent);
     }
 
+    /**
+     * returns a Food for a given id or null if no unique id was found
+     * @param id id of the Food
+     * @return Food or null
+     * @author Malte Schulze Hobeling
+     */
     public static Food getFoodById(long id){
         List<String> entry = Database.getEntryById("food",id);
+        if(entry.size() != 1){
+            return null;
+        }
         String[] parts = entry.get(0).split(":");
         String name = parts[1];
         String description = parts[2];
@@ -133,20 +159,44 @@ public class FoodMgr {
         return new Food(id,name,description,isDessert,foodType,allergies);
     }
 
+    /**
+     * returns a FoodType for a given id or null if no unique id was found
+     * @param id id of the FoodType
+     * @return FoodType or null
+     * @author Malte Schulze Hobeling
+     */
     public static FoodType getFoodTypeById(long id){
         List<String> entry = Database.getEntryById("food_type",id);
+        if(entry.size() != 1){
+            return null;
+        }
         String[] typeParts = entry.get(0).split(":");
         return new FoodType(Long.parseLong(typeParts[0]),typeParts[1]);
     }
 
+    /**
+     * returns an Allergy for a given id or null if no unique id was found
+     * @param id id of the Allergy
+     * @return Allergy or null
+     * @author Malte Schulze Hobeling
+     */
     public static Allergy getAllergyById(long id){
         String[] allergyH = {"id"};
         String[] allergyD = {String.valueOf(id)};
-        List<String> allergies = Database.select("allergy",allergyH,allergyD);
-        String[] allergyParts = allergies.get(0).split(":");
+        List<String> entry = Database.select("allergy",allergyH,allergyD);
+        if(entry.size() != 1){
+            return null;
+        }
+        String[] allergyParts = entry.get(0).split(":");
         return new Allergy(id,allergyParts[1],allergyParts[2]);
     }
 
+    /**
+     * returns all Allergies for a given foodId
+     * @param foodId the foodId you want the allergies from
+     * @return a List of Allergy, can be empty
+     * @author Malte Schulze Hobeling
+     */
     public static List<Allergy> getAllergies(long foodId){
         List<Allergy> allergies = new ArrayList<>();
         String[] restrictionsH = {"foodid"};
@@ -163,11 +213,12 @@ public class FoodMgr {
      * inserts the selected food into food_Selection if the food_plan has not been sent
      * @param food_selectionData childid, food_planid, foodid
      * @return id or -1
+     * @author Malte Schulze Hobeling
      */
     public static long createFood_selection(String[] food_selectionData){
         String[] food_selectionH = {"childid","food_planid","foodid"};
         FoodPlan food_plan = getFoodPlanById(Long.parseLong(food_selectionData[1]));
-        if(!food_plan.isSent()){
+        if(food_plan != null && !food_plan.isSent()){
             return Database.insert("food_selection",food_selectionH,food_selectionData);
         }else {
             return -1;
@@ -178,6 +229,7 @@ public class FoodMgr {
      * accumulates the selected food for a given day and locks the corresponding food_plan
      * @param date YYYY-MM-DD day
      * @return the accumulated orders
+     * @author Malte Schulze Hobeling
      */
     public static List<String> getDayOrder(String date){
         List<String> orders = new ArrayList<>();

src/main/java/com/bib/essensbestellungsverwaltung/FoodPlan.java

@@ -1,5 +1,10 @@
 package com.bib.essensbestellungsverwaltung;
 
+/**
+ * FoodPlan
+ * one constructor is used to create new foodPlans the other is used to create existing foodPlans from database
+ * @author Malte Schulze Hobeling
+ */
 public class FoodPlan {
     private long id;
     private String date;

src/main/java/com/bib/essensbestellungsverwaltung/FoodType.java

@@ -1,8 +1,9 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
+/**
+ * FoodType used by Food, not intended to be changed
+ * @author Malte Schulze Hobeling
+ */
 public class FoodType {
     private long id;
     private String name;

src/main/java/com/bib/essensbestellungsverwaltung/Parent.java

@@ -1,11 +1,12 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * one constructor is used to create new parents the other is used to create existing parents from database
+ * @author Malte Schulze Hobeling
+ */
 public class Parent extends User{
     List<Child> children;
 

src/main/java/com/bib/essensbestellungsverwaltung/SuperMain.java

@@ -1,5 +1,10 @@
 package com.bib.essensbestellungsverwaltung;
 
+/**
+ * Acts as a launcher required to make it a .jar
+ * It is also used to select either the cli or the gui depending on starting arguments
+ * @author Malte Schulze Hobeling
+ */
 public class SuperMain {
     public static void main(String[] args) {
         if(args.length > 0){

src/main/java/com/bib/essensbestellungsverwaltung/User.java

@@ -1,8 +1,9 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
+/**
+ * one constructor is used to create new users the other is used to create existing users from database
+ * @author Malte Schulze Hobeling
+ */
 public class User {
     private long id;
     private String name;

src/main/java/com/bib/essensbestellungsverwaltung/Worker.java

@@ -1,8 +1,9 @@
 package com.bib.essensbestellungsverwaltung;
-/*
-    @author Malte Schulze Hobeling
- */
 
+/**
+ * one constructor is used to create new worker the other is used to create existing worker from database
+ * @author Malte Schulze Hobeling
+ */
 public class Worker extends User{
     public Worker(long id, String name, String firstname, String password, String email, Address address) {
         super(id, name, firstname, password, email, address);