diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/libraries/junit_jupiter.xml b/.idea/libraries/junit_jupiter.xml
new file mode 100644
index 0000000..68918cd
--- /dev/null
+++ b/.idea/libraries/junit_jupiter.xml
@@ -0,0 +1,17 @@
+<component name="libraryTable">
+  <library name="junit.jupiter" type="repository">
+    <properties maven-id="org.junit.jupiter:junit-jupiter:5.8.0" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter/5.8.0/junit-jupiter-5.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.8.0/junit-jupiter-api-5.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.8.0/junit-platform-commons-1.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-params/5.8.0/junit-jupiter-params-5.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-engine/5.8.0/junit-jupiter-engine-5.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.8.0/junit-platform-engine-1.8.0.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/markdown.xml b/.idea/markdown.xml
new file mode 100644
index 0000000..1e34094
--- /dev/null
+++ b/.idea/markdown.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <enabledExtensions>
+      <entry key="MermaidLanguageExtension" value="false" />
+      <entry key="PlantUMLLanguageExtension" value="false" />
+    </enabledExtensions>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..aa34541
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="11" project-jdk-type="JavaSDK" />
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..bc66fbe
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/oop_crashkurs.iml" filepath="$PROJECT_DIR$/.idea/oop_crashkurs.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/oop_crashkurs.iml b/.idea/oop_crashkurs.iml
new file mode 100644
index 0000000..d53d554
--- /dev/null
+++ b/.idea/oop_crashkurs.iml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/SimpleArrayMap" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/SimpleLinkedList" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="junit.jupiter" level="project" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/SimpleArrayMap/.idea/.gitignore b/SimpleArrayMap/.idea/.gitignore
new file mode 100644
index 0000000..e69de29
diff --git a/SimpleArrayMap/.idea/SimpleArrayMap.iml b/SimpleArrayMap/.idea/SimpleArrayMap.iml
new file mode 100644
index 0000000..547dd47
--- /dev/null
+++ b/SimpleArrayMap/.idea/SimpleArrayMap.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="junit.jupiter" level="project" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/SimpleArrayMap/.idea/libraries/junit_jupiter.xml b/SimpleArrayMap/.idea/libraries/junit_jupiter.xml
new file mode 100644
index 0000000..68918cd
--- /dev/null
+++ b/SimpleArrayMap/.idea/libraries/junit_jupiter.xml
@@ -0,0 +1,17 @@
+<component name="libraryTable">
+  <library name="junit.jupiter" type="repository">
+    <properties maven-id="org.junit.jupiter:junit-jupiter:5.8.0" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter/5.8.0/junit-jupiter-5.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.8.0/junit-jupiter-api-5.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.8.0/junit-platform-commons-1.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-params/5.8.0/junit-jupiter-params-5.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-engine/5.8.0/junit-jupiter-engine-5.8.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.8.0/junit-platform-engine-1.8.0.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file
diff --git a/SimpleArrayMap/.idea/markdown.xml b/SimpleArrayMap/.idea/markdown.xml
new file mode 100644
index 0000000..1e34094
--- /dev/null
+++ b/SimpleArrayMap/.idea/markdown.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <enabledExtensions>
+      <entry key="MermaidLanguageExtension" value="false" />
+      <entry key="PlantUMLLanguageExtension" value="false" />
+    </enabledExtensions>
+  </component>
+</project>
\ No newline at end of file
diff --git a/SimpleArrayMap/.idea/misc.xml b/SimpleArrayMap/.idea/misc.xml
new file mode 100644
index 0000000..31602d7
--- /dev/null
+++ b/SimpleArrayMap/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/classes" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/SimpleArrayMap/.idea/modules.xml b/SimpleArrayMap/.idea/modules.xml
new file mode 100644
index 0000000..a8a2e0c
--- /dev/null
+++ b/SimpleArrayMap/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/SimpleArrayMap.iml" filepath="$PROJECT_DIR$/.idea/SimpleArrayMap.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/SimpleArrayMap/.idea/vcs.xml b/SimpleArrayMap/.idea/vcs.xml
new file mode 100644
index 0000000..6c0b863
--- /dev/null
+++ b/SimpleArrayMap/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/SimpleArrayMap/.idea/workspace.xml b/SimpleArrayMap/.idea/workspace.xml
new file mode 100644
index 0000000..939d35c
--- /dev/null
+++ b/SimpleArrayMap/.idea/workspace.xml
@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="SELECTIVE" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="82cca40d-6a74-4c74-97be-88548b3f41df" name="Changes" comment="" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$/.." />
+  </component>
+  <component name="MarkdownSettingsMigration">
+    <option name="stateVersion" value="1" />
+  </component>
+  <component name="ProjectId" id="2FS5DB4h1ZHgsFjtInThNWkKFeC" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent">
+    <property name="RunOnceActivity.OpenProjectViewOnStart" value="true" />
+    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/../SimpleLinkedList" />
+    <property name="project.structure.last.edited" value="Project" />
+    <property name="project.structure.proportion" value="0.15" />
+    <property name="project.structure.side.proportion" value="0.2" />
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="82cca40d-6a74-4c74-97be-88548b3f41df" name="Changes" comment="" />
+      <created>1664472523385</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1664472523385</updated>
+    </task>
+    <servers />
+  </component>
+</project>
\ No newline at end of file
diff --git a/SimpleArrayMap/src/solution/SimpleMapTest.java b/SimpleArrayMap/src/solution/SimpleMapTest.java
index 89064a0..be2bc00 100644
--- a/SimpleArrayMap/src/solution/SimpleMapTest.java
+++ b/SimpleArrayMap/src/solution/SimpleMapTest.java
@@ -2,12 +2,13 @@ package solution;
 
 import testat.ASimpleMapTest;
 import testat.ISimpleMap;
+import solution.SimpleArrayMap;
 
 public class SimpleMapTest extends ASimpleMapTest{
 
 	@Override
 	protected ISimpleMap<String, String> getInstance() {
 		
-		return new SimpleArrayMap<>(5);
+		return new SimpleArrayMap<String, String>(5);
 	}
 }
diff --git a/SimpleArrayMap/src/testat/ASimpleMapTest.java b/SimpleArrayMap/src/testat/ASimpleMapTest.java
index f22d71d..fee25a4 100644
--- a/SimpleArrayMap/src/testat/ASimpleMapTest.java
+++ b/SimpleArrayMap/src/testat/ASimpleMapTest.java
@@ -1,13 +1,14 @@
 package testat;
 
-import static org.junit.Assert.assertEquals;
-
-import java.util.function.Consumer;
-
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+import java.util.function.Consumer;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import testat.ISimpleMap;
+
 public abstract class ASimpleMapTest {
 
 	ISimpleMap<String, String> map;
@@ -60,7 +61,7 @@ public abstract class ASimpleMapTest {
 	void testadd4() {
 		add3();
 		map.put("4", "Vier");
-		map.put("5", "Fünf");
+		map.put("5", "F�nf");
 		map.remove("3");
 		map.put("6", "Sechs");
 
@@ -71,7 +72,7 @@ public abstract class ASimpleMapTest {
 		actual = map.get("4");
 		assertEquals("Vier", actual);
 		actual = map.get("5");
-		assertEquals("Fünf", actual);
+		assertEquals("F�nf", actual);
 		actual = map.get("6");
 		assertEquals("Sechs", actual);
 	}
diff --git a/SimpleArrayMap/src/testat/SimpleArrayMap.java b/SimpleArrayMap/src/testat/SimpleArrayMap.java
new file mode 100644
index 0000000..2427905
--- /dev/null
+++ b/SimpleArrayMap/src/testat/SimpleArrayMap.java
@@ -0,0 +1,4 @@
+package src.testat;
+
+public class SimpleArrayMap {
+}
diff --git a/SimpleLinkedList/src/solution/SimpleLinkedList.java b/SimpleLinkedList/src/solution/SimpleLinkedList.java
index ea4bc75..8c4b8cc 100644
--- a/SimpleLinkedList/src/solution/SimpleLinkedList.java
+++ b/SimpleLinkedList/src/solution/SimpleLinkedList.java
@@ -9,6 +9,7 @@ public class SimpleLinkedList<E> extends AbstractSimpleList<E> {
 		firstNode = null;
 		size = 0;
 	}
+	
 
 	@Override
 	public int size() {