Java 11 migrate c-d (remaining) (#1111)

* Moves converter pattern to Java 11

* Moves cqrs pattern to Java 11

* Moves dao pattern to Java 11

* Moves data-bus pattern to Java 11

* Moves data-locality pattern to Java 11

* Moves data-mapper pattern to Java 11

* Moves data-transfer-object pattern to Java 11

* Moves decorator pattern to Java 11

* Moves delegation pattern to Java 11

* Moves dependency-injection to Java 11

* Moves dirty-flag to Java 11

* Moves double-buffer to Java 11

* Moves double-checked-locking to Java 11

* Moves double-dispatch to Java 11

* Corrects with changes thats breaking test cases

data-mapper/src/test/java/com/iluwatar/datamapper/AppTest.java

@@ -32,7 +32,6 @@ public final class AppTest {
 
   @Test
   public void test() {
-    final String[] args = {};
-    App.main(args);
+    App.main();
   }
 }

data-mapper/src/test/java/com/iluwatar/datamapper/DataMapperTest.java

@@ -23,11 +23,11 @@
 
 package com.iluwatar.datamapper;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 
+import org.junit.jupiter.api.Test;
+
 /**
  * The Data Mapper (DM) is a layer of software that separates the in-memory objects from the
  * database. Its responsibility is to transfer data between the two and also to isolate them from
@@ -46,11 +46,11 @@ public class DataMapperTest {
   public void testFirstDataMapper() {
 
     /* Create new data mapper of first type */
-    final StudentDataMapper mapper = new StudentDataMapperImpl();
+    final var mapper = new StudentDataMapperImpl();
 
     /* Create new student */
-    int studentId = 1;
-    Student student = new Student(studentId, "Adam", 'A');
+    var studentId = 1;
+    var student = new Student(studentId, "Adam", 'A');
 
     /* Add student in respectibe db */
     mapper.insert(student);
@@ -59,7 +59,7 @@ public class DataMapperTest {
     assertEquals(studentId, mapper.find(student.getStudentId()).get().getStudentId());
 
     /* Update existing student object */
-    String updatedName = "AdamUpdated";
+    var updatedName = "AdamUpdated";
     student = new Student(student.getStudentId(), updatedName, 'A');
 
     /* Update student in respectibe db */

data-mapper/src/test/java/com/iluwatar/datamapper/StudentTest.java

@@ -23,12 +23,10 @@
 
 package com.iluwatar.datamapper;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
 
 /**
  * Tests {@link Student}.
@@ -36,8 +34,8 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 public final class StudentTest {
 
   /**
-   * This API tests the equality behaviour of Student object
-   * Object Equality should work as per logic defined in equals method
+   * This API tests the equality behaviour of Student object Object Equality should work as per
+   * logic defined in equals method
    *
    * @throws Exception if any execution error during test
    */
@@ -45,9 +43,9 @@ public final class StudentTest {
   public void testEquality() throws Exception {
 
     /* Create some students */
-    final Student firstStudent = new Student(1, "Adam", 'A');
-    final Student secondStudent = new Student(2, "Donald", 'B');
-    final Student secondSameStudent = new Student(2, "Donald", 'B');
+    final var firstStudent = new Student(1, "Adam", 'A');
+    final var secondStudent = new Student(2, "Donald", 'B');
+    final var secondSameStudent = new Student(2, "Donald", 'B');
 
     /* Check equals functionality: should return 'true' */
     assertEquals(firstStudent, firstStudent);