diff --git a/src/IHelloWorldWriter.java b/src/IHelloWorldWriter.java
new file mode 100644
index 0000000..3768187
--- /dev/null
+++ b/src/IHelloWorldWriter.java
@@ -0,0 +1,3 @@
+
+public interface IHelloWorldWriter {
+}
diff --git a/src/Praktikum3/ErrorWrite.java b/src/Praktikum3/ErrorWrite.java
new file mode 100644
index 0000000..abb19c5
--- /dev/null
+++ b/src/Praktikum3/ErrorWrite.java
@@ -0,0 +1,8 @@
+package Praktikum3;
+
+public class ErrorWrite implements IHelloWorld2{
+    @Override
+    public void writeHelloWorld(){
+        System.err.println("Hello World");
+    }
+}
diff --git a/src/Praktikum3/Executor.java b/src/Praktikum3/Executor.java
new file mode 100644
index 0000000..69861d9
--- /dev/null
+++ b/src/Praktikum3/Executor.java
@@ -0,0 +1,7 @@
+package Praktikum3;
+
+public class Executor implements IHelloWorldWriter {
+    public static void printHelloWorld(IHelloWorldWriter writer1, IHelloWorldWriter writer2, boolean second){
+
+    }
+}
diff --git a/src/Praktikum3/IHelloWorld2.java b/src/Praktikum3/IHelloWorld2.java
new file mode 100644
index 0000000..31f73ee
--- /dev/null
+++ b/src/Praktikum3/IHelloWorld2.java
@@ -0,0 +1,5 @@
+package Praktikum3;
+
+public interface IHelloWorld2 {
+    void writeHelloWorld();
+}
diff --git a/src/Praktikum3/OutWriter.java b/src/Praktikum3/OutWriter.java
new file mode 100644
index 0000000..e2ab6a2
--- /dev/null
+++ b/src/Praktikum3/OutWriter.java
@@ -0,0 +1,8 @@
+package Praktikum3;
+
+public class OutWriter implements IHelloWorld2{
+    @Override
+    public void writeHelloWorld() {
+        System.out.println("Hello World");
+    }
+}