diff --git a/src/org/eidecker/oca8lernen/general/HeaderList.java b/src/org/eidecker/oca8lernen/general/HeaderList.java
index bd739cc..c4b9734 100644
--- a/src/org/eidecker/oca8lernen/general/HeaderList.java
+++ b/src/org/eidecker/oca8lernen/general/HeaderList.java
@@ -1,9 +1,58 @@
 package org.eidecker.oca8lernen.general;
 
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
 
 /**
  * @author seidecke.
  */
 public class HeaderList extends ArrayList {
 }
+
+
+class Listtest {
+
+	@Test
+	public void testListInterface() {
+		anyList().add("Hallo");
+	}
+
+
+	@Test
+	public void testHashMapInterface() {
+
+		Map<String, List<String>> map = new HashMap<>();
+		List<String> l = new ArrayList<>();
+		l.add("1");
+		map.put("1", l);
+		map.get("1").add("2");
+
+		System.out.println(map.values());
+
+	}
+
+	private List<String> anyList() {
+		return Collections.emptyList();
+	}
+
+	@Test
+	public void longList() {
+		LinkedList linkedList = new LinkedList();
+
+		for (int i = 0; i <= Integer.MAX_VALUE; i++) {
+			linkedList.add(i);
+			if (i % 1_000_000 == 0) System.out.println(i / 1_000_000 + " Millionen, " + (((double)i / Integer.MAX_VALUE) * 100) + " Prozent");
+
+		}
+
+		linkedList.add(-1);
+	}
+
+
+
+}
diff --git a/src/org/eidecker/oca8lernen/lastminute/Kleinigkeiten.java b/src/org/eidecker/oca8lernen/lastminute/Kleinigkeiten.java
index 65965a1..23a070e 100644
--- a/src/org/eidecker/oca8lernen/lastminute/Kleinigkeiten.java
+++ b/src/org/eidecker/oca8lernen/lastminute/Kleinigkeiten.java
@@ -17,7 +17,7 @@ public class Kleinigkeiten {
 		LocalTime t1 = LocalTime.now();
 		LocalDate t2 = LocalDate.now();
 
-		t1 instanceof t2;
+		// t1 instanceof t2;
 
 
 		return "Sinnlos";