first commit

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_15" default="true" project-jdk-name="15" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/Test.iml" filepath="$PROJECT_DIR$/Test.iml" />
+    </modules>
+  </component>
+</project>

Test.iml

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+<?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" />
+  </component>
+</module>

src/Main.java

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+
+public class Main {
+    public Main(String[] args) {
+        Menue menue = new Menue();
+        menue.putMethode("a", Main::addieren, "addiert zwei Zahlen");
+        help(args);
+        menue.replaceHelp(Main::help);
+        menue.exitMessage("Bis zum nächsten mal!");
+        menue.putCommands();
+    }
+
+    private static void help(String[] args) {
+        System.out.println("Functions: ");
+        System.out.println("  (a) Addieren von zwei Werten");
+        System.out.println("  (h) Hilfe. ");
+        System.out.println("  (e) Exit. ");
+    }
+
+    private static void addieren(String[] strings) {
+        int a = 2 + 3;
+        System.out.println("2 + 3 = " + a);
+    }
+
+    public static void main(String[] args) {
+        new Main(args);
+    }
+    
+}

src/Menue.java

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+import java.util.HashMap;
+import java.util.Scanner;
+import java.util.function.Consumer;
+
+/**
+ * This Class is a simple text menu where you can put your methode.
+ */
+public class Menue {
+    //one HashMap is for Commands, the other is for the description.
+    private final HashMap<String, Consumer<String[]>> commands;
+    private final HashMap<String, String> description;
+    private String exitMsg = "";
+    private boolean exitMsgSet = false;
+
+    //default Constructor initialize both HashMaps and puts help and exit commands.
+    public Menue() {
+        commands = new HashMap<>();
+        description = new HashMap<>();
+        description.put("h", "help");
+        description.put("e", "exit");
+        commands.put("h", this::help);
+        commands.put("e", this::exit);
+    }
+
+    //while true loop for input (must be at the end of your code)
+    public void putCommands() {
+        while (true) {
+            input();
+            System.out.println();
+        }
+    }
+
+    //input Methode (used by only the class)
+    private void input() {
+        Scanner scan = new Scanner(System.in);
+        System.out.print("$ ");
+        String line = scan.nextLine();
+        System.out.println("Input: " + line);
+
+        String[] args = new String[0];
+
+        if (commands.get(line) != null) {
+            commands.get(line).accept(args);
+        } else {
+            System.err.println("INVALID INPUT");
+        }
+    }
+
+    //default help methode
+    public void help(String[] args) {
+        System.out.println("default help, for better feeling implement the Methode. ");
+        System.out.println("Commands: " + description);
+    }
+
+    //set exitMessage if u want
+    public void exitMessage(String txt){
+        exitMsg = txt;
+        exitMsgSet = true;
+    }
+
+    //exit methode
+    public void exit(String[] args) {
+        if (exitMsgSet){
+            System.out.println(exitMsg);
+        }
+        System.exit(0);
+    }
+
+    //for replacing the scuffed help Methode
+    public void replaceHelp(Consumer<String[]> stringA) {
+        commands.replace("h", stringA);
+    }
+
+    //Methode for putting your methode in the Menu
+    public void putMethode(String string, Consumer<String[]> stringA, String text) {
+        commands.put(string, stringA);
+        description.put(string, text);
+    }
+}