adds json libraries, chaotic TryOut but works

.gitignore

@@ -1 +1,2 @@
-out/
+out/
+lib/

.idea/howtodata.iml

@@ -7,5 +7,7 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="javax.json.api" level="project" />
+    <orderEntry type="library" name="glassfish.javax.json" level="project" />
   </component>
 </module>

java_src/Address.java

@@ -0,0 +1,5 @@
+package java_src;
+
+public record Address(String street,
+                      String number,
+                      String city) { }

java_src/Person.java

@@ -0,0 +1,10 @@
+package java_src;
+
+import java.util.ArrayList;
+
+public record Person(String name,
+                     int age,
+                     String email,
+                     Address address,
+                     ArrayList<String> hobbies,
+                     ArrayList<String> friends) { }

java_src/TryOut.java

@@ -1,17 +1,59 @@
 package java_src;
 
+import javax.json.*;
 import java.io.IOException;
+import java.io.StringReader;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.ArrayList;
 
 public class TryOut {
 
     public static void main(String[] args) {
+        String jsonString;
         try {
-            Path path = Paths.get("/home/jan/git-projekte/howtodata/JSON/alice.json");
-            System.out.println(FileHelper.readJson(path));
+            // Path path = Paths.get("/home/jan/git-projekte/howtodata/JSON/alice.json"); // Absoluter Pfad
+            Path path = Paths.get("JSON/alice.json"); // Besser: relativer Pfad
+            jsonString = FileHelper.readJson(path);
+            System.out.println("Aus Datei eingelesener Json-String:");
+            System.out.println(jsonString);
         } catch (IOException e) {
             System.err.println(e);
+            jsonString = "{}";
         }
+        JsonReader jsonReader = Json.createReader(new StringReader(jsonString));
+        JsonObject ali = jsonReader.readObject();
+        jsonReader.close();
+        System.out.println("In JsonObject verwandelt:");
+        System.out.println(ali.toString());
+        System.out.println("Aus JsonObject erzeugtes Java-Record:");
+        Person a1 = aliceAutomatically(ali);
+        System.out.println(a1);
+        System.out.println("Manuell erzeugtes Java-Record:");
     }
+
+    private static Person aliceAutomatically(JsonObject ali) {
+        ArrayList<String> hob = new ArrayList<>();
+        for (JsonValue hobby : ali.getJsonArray("hobbies")) {
+            JsonString jsonhobby = (JsonString) hobby;
+            hob.add(jsonhobby.getString());
+        }
+        ArrayList<String> fri = new ArrayList<>();
+        for (JsonValue friend : ali.getJsonArray("friends")) {
+            JsonString jsonFriend = (JsonString) friend;
+            fri.add(jsonFriend.getString());
+        }
+        JsonObject jasonAddr = ali.getJsonObject("address");
+        Address javaAddr = new Address(jasonAddr.getString("street"),
+                jasonAddr.getString("number"),
+                jasonAddr.getString("city"));
+        Person aliAuto = new Person(ali.getString("name"),
+                ali.getInt("age"),
+                ali.getString("email"),
+                javaAddr,
+                hob,
+                fri);
+        return aliAuto;
+    }
+
 }