diff --git a/Test/Aufgabe1_KellerautomatTest.java b/Test/Aufgabe1_KellerautomatTest.java
new file mode 100644
index 0000000..ae511ad
--- /dev/null
+++ b/Test/Aufgabe1_KellerautomatTest.java
@@ -0,0 +1,19 @@
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class Aufgabe1_KellerautomatTest {
+
+    @Test
+    void calculate() {
+        String[] acceptableWords = {"ZZO", "ZZOZZOO", "ZZZOO"};
+        for (String word : acceptableWords) {
+            assertTrue(Aufgabe1_Kellerautomat.calculate(word));
+        }
+
+        String[] notAcceptableWords = {"ZZOO", "ZZOZZO", "ZOZ"};
+        for (String word : notAcceptableWords) {
+            assertFalse(Aufgabe1_Kellerautomat.calculate(word));
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Aufgabe1_Kellerautomat.java b/src/Aufgabe1_Kellerautomat.java
new file mode 100644
index 0000000..6473ef5
--- /dev/null
+++ b/src/Aufgabe1_Kellerautomat.java
@@ -0,0 +1,105 @@
+import java.util.ArrayList;
+
+public class Aufgabe1_Kellerautomat {
+    private static String[] words = {"ZZO", "ZZOZZOO", "ZZZOO", "ZZOO", "ZZOZZO", "ZOZ"};
+
+    public static void main(String[] args) {
+        for (String word : words) {
+            calculate(word);
+        }
+    }
+
+    public static boolean calculate(String word) {
+        char[] wordChars = word.toCharArray();
+        ArrayList<Character> stack = new ArrayList<>();
+        stack.add('$');
+
+        int state = 0; //case 0 - 5 = q0 - q5, case -1 = Abfallzustand
+
+        for (char symbol : wordChars) {
+            Character stackSymbol = stack.remove(stack.size() - 1);
+            switch (state) {
+                case 0:
+                    if (symbol == 'Z' && stackSymbol == '$') {
+                        stack.add('$');
+                        stack.add('Z');
+                        state = 1;
+                    } else {
+                        dontAccept(word);
+                        return false;
+                    }
+                    break;
+                case 1:
+                    if (symbol == 'Z' && stackSymbol == 'Z') {
+                        stack.add('Z');
+                        stack.add('Z');
+                        state = 2;
+                    } else {
+                        dontAccept(word);
+                        return false;
+                    }
+                    break;
+                case 2:
+                    if (symbol == 'O' && stackSymbol == 'Z') {
+                        state = 3;
+                    } else if (symbol == 'Z' && stackSymbol == 'Z') {
+                        stack.add('Z');
+                        stack.add('Z');
+                        state = 2;
+                    } else if (symbol == 'Z' && stackSymbol == '$') {
+                        stack.add('$');
+                        stack.add('Z');
+                        state = 2;
+                    } else {
+                        dontAccept(word);
+                        return false;
+                    }
+                    break;
+                case 3:
+                    if (symbol == 'O' && stackSymbol == 'Z') {
+                        state = 3;
+                    } else if (symbol == 'Z' && stackSymbol == 'Z') {
+                        stack.add('Z');
+                        stack.add('Z');
+                        state = 2;
+                    } else {
+                        dontAccept(word);
+                        return false;
+                    }
+                    break;
+            }
+        }
+
+        if (state == 3 && stack.size() >= 1 && stack.remove(stack.size() - 1) == 'Z') {
+            state = 4;
+        } else {
+            dontAccept(word);
+            return false;
+        }
+
+        if (state == 4 && stack.size() >= 1 && stack.remove(stack.size() - 1) == '$') {
+            state = 5;
+        } else {
+            dontAccept(word);
+            return false;
+        }
+
+        if (state == 5) {
+            accept(word);
+            return true;
+        } else {
+            dontAccept(word);
+            return false;
+        }
+
+    }
+
+    private static void dontAccept(String word) {
+        System.out.println("Word: " + word  + "\nnot accepted");
+    }
+
+    private static void accept(String word) {
+        System.out.println("Word: " + word  + "\naccepted ");
+    }
+
+}