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src/main/java/org/example/MetaValidator.java

+package org.example;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.stream.Stream;
+
+public class MetaValidator {
+
+    public MetaValidator(){
+
+    }
+    /* get Field names from all the classes, concatenate them to one array and iterate
+     to check if a name violate the 20 rule or starts with uppercase-> return false */
+    public static boolean ValidateFieldsNames(){
+
+        Book book = new Book();
+        Article article = new Article();
+        boolean checker = false; // checker of violation
+        Field[] fieldsBook= book.getClass().getDeclaredFields();
+        Field[] fieldsArticle= article.getClass().getDeclaredFields();
+
+        Field[] both = Stream.concat(Arrays.stream(fieldsBook), // concatenate Fields of both classes
+                        Arrays.stream(fieldsArticle))
+                .toArray(Field[]::new);
+
+        for(Field f : both) {
+            if(f.getName().length() > 20 || Character.isUpperCase(f.getName().charAt(0))) {
+                System.out.println("Field \"" + f.getName() +"\" has more than 20 characters or dose not start with lower-case");
+                checker = true;
+            }
+        }
+        if(checker)
+            return false;
+        return true;
+    }
+
+    /* check if Methods start with lowercase or have more than 40 characters like implementation above */
+    public static boolean ValidateMethodsNames(){
+
+        Book book = new Book();
+        Article article = new Article();
+        boolean checker = false;
+        Method[] methodsBook= book.getClass().getDeclaredMethods();
+        Method[] methodsArticle= article.getClass().getDeclaredMethods();
+
+        Method[] both = Stream.concat(Arrays.stream(methodsBook),
+                        Arrays.stream(methodsArticle))
+                .toArray(Method[]::new);
+
+        for(Method f : both) {
+            if(f.getName().length() > 40 || Character.isUpperCase(f.getName().charAt(0))) {
+                System.out.println("Method \"" + f.getName() +"\" has more than 40 characters or dose not start with lower-case");
+                checker = true;
+            }
+        }
+        if(checker)
+            return false;
+        return true;
+    }
+
+}
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