diff --git a/src/main/java/PasswordManager.java b/src/main/java/PasswordManager.java
index 97c4711..29960fd 100644
--- a/src/main/java/PasswordManager.java
+++ b/src/main/java/PasswordManager.java
@@ -1,16 +1,42 @@
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Scanner;
+
 public class PasswordManager implements PasswordManagerInterface {
+
+    boolean running = true;
+    InputStream inputStream = System.in;
+    OutputStream outputStream = System.out;
+
     public static void main(String[] args) {
         PasswordManager pm = new PasswordManager();
-        pm.showMenu();
+
+        while (pm.running) {
+            pm.showMenu();
+        }
+        System.exit(0);
     }
 
     public PasswordManager() {
-        System.out.println("Hello World");
+        println("Hello World");
     }
 
     @Override
     public void listVaults() {
+        println("Vaults:");
+    }
 
+    private void println(String output) {
+        try {
+            outputStream.write((output + "\n").getBytes(StandardCharsets.UTF_8));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
     }
 
     @Override
@@ -20,6 +46,55 @@ public class PasswordManager implements PasswordManagerInterface {
 
     @Override
     public void showMenu() {
+        StringBuilder sb = new StringBuilder();
+        Scanner scan = new Scanner(inputStream);
+        running = true;
+
+        sb.append("\nciip Gruppe 8 - Password Manager\n\n");
+
+        sb.append("Menu:\n");
+        sb.append("- list vaults: l:\n");
+        sb.append("- select vault: v x (replace x with vault id)\n");
+        sb.append("- exit: e\n");
+
+        println(sb.toString());
+
+        String input = scan.nextLine();
+
+        if (input.equals("e")) {
+            running = false;
+        } else if (input.equals("l")) {
+            listVaults();
+        }  else if (input.startsWith("v")) {
+            String vaultAction = (input.replace('v', ' ')).trim();
+            int vaultId = -1;
+
+            try {
+                vaultId = Integer.parseInt(vaultAction);
+            } catch (NumberFormatException e) {
+                println("-- please enter a correct vault id");
+            }
+
+            if (vaultId >= 0) {
+                try {
+                    int internalOptionCounter = 0;
+                    ArrayList<String> options = new ArrayList<>();
 
+                    for (Method m : Class.forName("Vault").getDeclaredMethods()) {  // returns all declared methods including private or protected
+                        try {
+                            if (Modifier.isPublic(this.getClass().getDeclaredMethod(m.getName()).getModifiers())) {  // filter out methods that are not public (using Modifier) or have arguments (using getDeclaredMethod)
+                                options.add(m.getName());
+                                println(internalOptionCounter + " - " + m.getName());
+                                internalOptionCounter++;
+                            }
+                        } catch (NoSuchMethodException ignore) {
+                            // println("No method with name " + m.getName() + " found");
+                        }
+                    }
+                } catch (ClassNotFoundException e) {
+                    println("-- vaults not implemented yet");
+                }
+            }
+        }
     }
 }
diff --git a/src/main/java/PasswordManagerInterface.java b/src/main/java/PasswordManagerInterface.java
index 385532f..b7a7616 100644
--- a/src/main/java/PasswordManagerInterface.java
+++ b/src/main/java/PasswordManagerInterface.java
@@ -1,3 +1,6 @@
+import java.io.InputStream;
+import java.io.OutputStream;
+
 public interface PasswordManagerInterface {
     public static void main(String[] args) {
     };
diff --git a/src/test/java/PasswordManagerTest.java b/src/test/java/PasswordManagerTest.java
index b18cf0d..149e12f 100644
--- a/src/test/java/PasswordManagerTest.java
+++ b/src/test/java/PasswordManagerTest.java
@@ -1,6 +1,12 @@
 import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.NoSuchElementException;
+
 import static org.junit.jupiter.api.Assertions.*;
 
 
@@ -13,6 +19,12 @@ class PasswordManagerTest {
         pm = new PasswordManager();
     }
 
+    @BeforeEach
+    void reset() {
+        pm.outputStream = System.out;
+        pm.inputStream = System.in;
+    }
+
     @Test
     void constructor() {
         assertInstanceOf(PasswordManager.class, pm);
@@ -28,8 +40,55 @@ class PasswordManagerTest {
         pm.openVault();
     }
 
+    @Test
+    void menuNavigationListVaults() {
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        pm.inputStream = new ByteArrayInputStream("l\n".getBytes(StandardCharsets.UTF_8));
+        pm.outputStream = outputStream;
+        pm.showMenu();
+        assertTrue(outputStream.toString().endsWith("Vaults:\n"));
+    }
+
+    @Test
+    void menuNavigationOpenVault() {
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        pm.inputStream = new ByteArrayInputStream("v 0\n".getBytes(StandardCharsets.UTF_8));
+        pm.outputStream = outputStream;
+        pm.showMenu();
+        assertTrue(outputStream.toString().endsWith("-- vaults not implemented yet\n"));
+    }
+
     @Test
     void showMenu() {
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        pm.inputStream = getEmptyStringInputStream();
+        pm.outputStream = outputStream;
+        assertThrowsExactly(NoSuchElementException.class, () -> pm.showMenu());
+        assertTrue(outputStream.toString().startsWith("\nciip Gruppe 8"));
+    }
+
+    @Test
+    void exitMenu() {
+        pm.inputStream = new ByteArrayInputStream("e\n".getBytes(StandardCharsets.UTF_8));
         pm.showMenu();
+        assertFalse(pm.running);
+    }
+
+    @Test
+    void doNotExitMenuAfterWrongInput() {
+        pm.inputStream = new ByteArrayInputStream("__\n".getBytes(StandardCharsets.UTF_8));
+        pm.showMenu();
+        assertTrue(pm.running);
+
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        pm.inputStream = getEmptyStringInputStream();
+        pm.outputStream = outputStream;
+
+        assertThrowsExactly(NoSuchElementException.class, () -> pm.showMenu());
+        assertTrue(outputStream.toString().startsWith("\nciip Gruppe 8"));
+    }
+
+    private ByteArrayInputStream getEmptyStringInputStream() {
+        return new ByteArrayInputStream("".getBytes(StandardCharsets.UTF_8));
     }
 }