add demo for UI-logic separation

.vscode/launch.json

@@ -4,6 +4,13 @@
   // Weitere Informationen finden Sie unter https://go.microsoft.com/fwlink/?linkid=830387
   "version": "0.2.0",
   "configurations": [
+    {
+      "type": "java",
+      "name": "UI",
+      "request": "launch",
+      "mainClass": "UI",
+      "projectName": "PR2-L_e28f9f2c"
+    },
     {
       "type": "java",
       "name": "FraktalDemoThread",

SeparateU_Logic/.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

SeparateU_Logic/README.md

@@ -0,0 +1,18 @@
+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).

SeparateU_Logic/src/Logic.java

@@ -0,0 +1,37 @@
+public class Logic {
+  private int zahl1;
+  private int zahl2;
+
+  public Logic(int z1, int z2) {
+    zahl1 = z1;
+    zahl2 = z2;
+  }
+
+  private int add() { return zahl1 + zahl2; }
+  private int subtract() { return zahl1 - zahl2; }
+  private int multiply() { return zahl1 * zahl2; }
+  private int divide() { return zahl1 / zahl2; }
+
+  /**
+   * This method adds, subtracts, ....
+   * 
+   * @param op
+   * @return result of basic operation
+   */
+  public int calculate(String op)
+  {
+    if(op.equals("+"))
+      return add();
+
+    if(op.equals("-"))
+      return subtract();
+    
+    if(op.equals("*"))
+      return multiply();
+    
+    if(op.equals(":"))
+      return divide();
+    
+    return 0;
+  }
+}

SeparateU_Logic/src/UI.java

@@ -0,0 +1,35 @@
+import java.util.Scanner;
+
+public class UI {
+    private static int zahl1;
+    private static int zahl2;
+    private static String operator;
+
+    public static void main(String[] args) throws Exception {
+        eingabe();
+        ausgabe();
+    }
+
+    public static void eingabe() {
+      Scanner sc = new Scanner(System.in);
+
+      System.out.print("1. Zahl eingeben: " );
+      zahl1 = sc.nextInt();
+
+      System.out.print("2. Zahl eingeben: " );
+      zahl2 = sc.nextInt();
+
+      sc.nextLine();
+
+      System.out.print("Operand (+/-/*/:): " );
+      operator = sc.nextLine();
+    }
+
+    public static void ausgabe() {
+      Logic c = new Logic(zahl1, zahl2);
+
+      int ergebnis = c.calculate(operator);
+
+      System.out.println("Das Ergebnis ist: " + ergebnis);
+    }
+}