diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 45136cb..7834b9b 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -3,6 +3,7 @@
   <component name="ChangeListManager">
     <list default="true" id="41dc023d-0769-466f-850a-8e3eed9fe5fa" name="Default Changelist" comment="">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/D_Test.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/D_Test.java" afterDir="false" />
     </list>
     <ignored path="$PROJECT_DIR$/out/" />
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
@@ -17,19 +18,16 @@
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
       <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/src/Main.java">
+        <entry file="file://$PROJECT_DIR$/src/D_Test.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="236">
-              <caret line="29" column="5" lean-forward="true" selection-start-line="29" selection-start-column="5" selection-end-line="29" selection-end-column="5" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/D_Geburtstag.java">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="255">
-              <caret line="15" selection-start-line="15" selection-end-line="15" />
+            <state relative-caret-position="799">
+              <caret line="47" column="14" lean-forward="true" selection-start-line="47" selection-start-column="14" selection-end-line="47" selection-end-column="14" />
+              <folding>
+                <element signature="imports" expanded="true" />
+                <element signature="e#196#197#0" expanded="true" />
+                <element signature="e#1401#1402#0" expanded="true" />
+                <element signature="e#1604#1605#0" expanded="true" />
+              </folding>
             </state>
           </provider>
         </entry>
@@ -54,6 +52,7 @@
         <option value="$PROJECT_DIR$/src/geburtstag.java" />
         <option value="$PROJECT_DIR$/src/Geburtstag.java" />
         <option value="$PROJECT_DIR$/src/Main.java" />
+        <option value="$PROJECT_DIR$/src/D_Test.java" />
       </list>
     </option>
   </component>
@@ -63,6 +62,9 @@
     <option name="width" value="1346" />
     <option name="height" value="728" />
   </component>
+  <component name="ProjectLevelVcsManager">
+    <ConfirmationsSetting value="2" id="Add" />
+  </component>
   <component name="ProjectView">
     <navigator proportions="" version="1">
       <foldersAlwaysOnTop value="true" />
@@ -108,7 +110,7 @@
       </list>
     </option>
   </component>
-  <component name="RunManager" selected="Application.Main">
+  <component name="RunManager" selected="Application.D_Test1">
     <configuration name="D_Geburtstag" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
       <option name="MAIN_CLASS_NAME" value="D_Geburtstag" />
       <module name="Alpha" />
@@ -116,6 +118,13 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
+    <configuration name="D_Test1" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="D_Test1" />
+      <module name="Alpha" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
     <configuration name="Main" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
       <option name="MAIN_CLASS_NAME" value="Main" />
       <module name="Alpha" />
@@ -139,6 +148,7 @@
     </configuration>
     <recent_temporary>
       <list>
+        <item itemvalue="Application.D_Test1" />
         <item itemvalue="Application.Main" />
         <item itemvalue="Application.D_Geburtstag" />
         <item itemvalue="Application.main" />
@@ -160,7 +170,7 @@
       <workItem from="1562341014848" duration="1785000" />
       <workItem from="1562343569757" duration="85000" />
       <workItem from="1562343774281" duration="2056000" />
-      <workItem from="1562347057096" duration="199000" />
+      <workItem from="1562347057096" duration="727000" />
     </task>
     <task id="LOCAL-00001" summary="neue master">
       <created>1562341097724</created>
@@ -211,11 +221,32 @@
       <option name="project" value="LOCAL" />
       <updated>1562346483053</updated>
     </task>
-    <option name="localTasksCounter" value="8" />
+    <task id="LOCAL-00008" summary="neue Klassen hinzugefügt, für Tests.">
+      <created>1562347496252</created>
+      <option name="number" value="00008" />
+      <option name="presentableId" value="LOCAL-00008" />
+      <option name="project" value="LOCAL" />
+      <updated>1562347496252</updated>
+    </task>
+    <task id="LOCAL-00009" summary="neue Klassen hinzugefügt, für Tests.">
+      <created>1562347599281</created>
+      <option name="number" value="00009" />
+      <option name="presentableId" value="LOCAL-00009" />
+      <option name="project" value="LOCAL" />
+      <updated>1562347599281</updated>
+    </task>
+    <task id="LOCAL-00010" summary="neue Klassen hinzugefügt, für Tests.">
+      <created>1562347624079</created>
+      <option name="number" value="00010" />
+      <option name="presentableId" value="LOCAL-00010" />
+      <option name="project" value="LOCAL" />
+      <updated>1562347624079</updated>
+    </task>
+    <option name="localTasksCounter" value="11" />
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="4685000" />
+    <option name="totallyTimeSpent" value="5034000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="-8" y="-8" width="1616" height="886" extended-state="6" />
@@ -231,19 +262,19 @@
       <window_info anchor="bottom" id="Messages" order="0" weight="0.32934928" />
       <window_info anchor="bottom" id="Message" order="1" />
       <window_info anchor="bottom" id="Find" order="2" />
-      <window_info active="true" anchor="bottom" id="Run" order="3" visible="true" weight="0.32934928" />
+      <window_info anchor="bottom" id="Run" order="3" weight="0.32934928" />
       <window_info anchor="bottom" id="Debug" order="4" weight="0.4" />
       <window_info anchor="bottom" id="Cvs" order="5" weight="0.25" />
       <window_info anchor="bottom" id="Inspection" order="6" weight="0.4" />
       <window_info anchor="bottom" id="TODO" order="7" />
       <window_info anchor="bottom" id="Docker" order="8" show_stripe_button="false" />
-      <window_info anchor="bottom" id="Version Control" order="9" />
+      <window_info anchor="bottom" id="Version Control" order="9" weight="0.32934928" />
       <window_info anchor="bottom" id="Database Changes" order="10" />
-      <window_info anchor="bottom" id="Terminal" order="11" weight="0.32934928" />
+      <window_info anchor="bottom" id="Terminal" order="11" visible="true" weight="0.32934928" />
       <window_info anchor="bottom" id="Event Log" order="12" side_tool="true" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
-      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+      <window_info active="true" anchor="right" content_ui="combo" id="Hierarchy" order="2" visible="true" weight="0.25" />
       <window_info anchor="right" id="Palette" order="3" />
       <window_info anchor="right" id="Theme Preview" order="4" />
       <window_info anchor="right" id="Maven" order="5" />
@@ -260,7 +291,8 @@
     <MESSAGE value="geburtstag sauber" />
     <MESSAGE value="Main bereinigt" />
     <MESSAGE value="junit klassen erst mal entfernen" />
-    <option name="LAST_COMMIT_MESSAGE" value="junit klassen erst mal entfernen" />
+    <MESSAGE value="neue Klassen hinzugefügt, für Tests." />
+    <option name="LAST_COMMIT_MESSAGE" value="neue Klassen hinzugefügt, für Tests." />
   </component>
   <component name="editorHistoryManager">
     <entry file="file://$PROJECT_DIR$/src/testJFrame.java" />
@@ -269,46 +301,44 @@
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
     <entry file="file://$PROJECT_DIR$/src/TestBmi.java" />
-    <entry file="file://$PROJECT_DIR$/src/Main.java">
+    <entry file="file://$PROJECT_DIR$/src/E_Test.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="236">
-          <caret line="29" column="5" selection-start-line="29" selection-start-column="5" selection-end-line="29" selection-end-column="5" />
+        <state>
+          <caret column="19" selection-start-column="19" selection-end-column="19" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/D_Geburtstag.java">
+    <entry file="file://$PROJECT_DIR$/src/M_Test.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="255">
-          <caret line="15" selection-start-line="15" selection-end-line="15" />
+        <state>
+          <caret column="19" selection-start-column="19" selection-end-column="19" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/D_Test.java">
+    <entry file="file://$PROJECT_DIR$/src/D_Geburtstag.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="799">
-          <caret line="47" column="9" selection-start-line="47" selection-start-column="9" selection-end-line="47" selection-end-column="9" />
-          <folding>
-            <element signature="e#168#169#0" expanded="true" />
-            <element signature="e#222#223#0" expanded="true" />
-            <element signature="e#1341#1342#0" expanded="true" />
-            <element signature="e#1403#1404#0" expanded="true" />
-            <element signature="e#1540#1541#0" expanded="true" />
-            <element signature="e#1604#1605#0" expanded="true" />
-          </folding>
+        <state relative-caret-position="255">
+          <caret line="15" selection-start-line="15" selection-end-line="15" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/M_Test.java">
+    <entry file="file://$PROJECT_DIR$/src/Main.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state>
-          <caret column="19" selection-start-column="19" selection-end-column="19" />
+        <state relative-caret-position="236">
+          <caret line="29" column="5" selection-start-line="29" selection-start-column="5" selection-end-line="29" selection-end-column="5" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/E_Test.java">
+    <entry file="file://$PROJECT_DIR$/src/D_Test.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state>
-          <caret column="19" selection-start-column="19" selection-end-column="19" />
+        <state relative-caret-position="799">
+          <caret line="47" column="14" lean-forward="true" selection-start-line="47" selection-start-column="14" selection-end-line="47" selection-end-column="14" />
+          <folding>
+            <element signature="imports" expanded="true" />
+            <element signature="e#196#197#0" expanded="true" />
+            <element signature="e#1401#1402#0" expanded="true" />
+            <element signature="e#1604#1605#0" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
diff --git a/src/D_Test.java b/src/D_Test1.java
similarity index 91%
rename from src/D_Test.java
rename to src/D_Test1.java
index 09c0bcb..7786e55 100644
--- a/src/D_Test.java
+++ b/src/D_Test1.java
@@ -2,15 +2,13 @@ import java.awt .*;
 import javax.swing .*;
 import java.awt.event .*;
 
-public class D_Test {
+public class D_Test1 {
 
-
-    public class NewStudent {
         public static void main(String[] args) {
-            NewStudent st = new NewStudent();
+            NewStudent st = new D_Test1();
         }
 
-        public NewStudent() {
+        public D_Test1() {
             JFrame frame = new JFrame("STUDENT REGISTRATION FORM");
             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
             frame.setSize(800, 600);
@@ -49,5 +47,4 @@ public class D_Test {
                 }
             });
         }
-    }
-}
+}
\ No newline at end of file
diff --git a/src/D_Test2.java b/src/D_Test2.java
new file mode 100644
index 0000000..79f8925
--- /dev/null
+++ b/src/D_Test2.java
@@ -0,0 +1,2 @@
+public class D_Test2 {
+}
diff --git a/src/D_Test3.java b/src/D_Test3.java
new file mode 100644
index 0000000..7264963
--- /dev/null
+++ b/src/D_Test3.java
@@ -0,0 +1,2 @@
+public class D_Test3 {
+}
diff --git a/src/E_Test.java b/src/E_Test.java
deleted file mode 100644
index de82447..0000000
--- a/src/E_Test.java
+++ /dev/null
@@ -1,2 +0,0 @@
-public class E_Test {
-}
diff --git a/src/M_Test.java b/src/M_Test.java
deleted file mode 100644
index 1f999bc..0000000
--- a/src/M_Test.java
+++ /dev/null
@@ -1,2 +0,0 @@
-public class M_Test {
-}