added some basic files

.editorconfig

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+root = true
+
+[*.{ps1,java}]
+charset = utf-8
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = true
+end_of_line = lf
+
+[*.java]
+insert_final_newline = true

.gitignore

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+# compiled class files.
+*.class
+
+# IntelliJ
+.idea/
+*.iml
+
+# Visual Studio Code
+.vscode/
+
+# output folders
+**/output/

T01/Aufgabe04/Aufgabe04.java

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+package T01.Aufgabe04;
+
+/**
+ * Teil 1 / Aufgabe 4
+ *
+ * @author Sebastian Brosch
+ */
+class Aufgabe04 {
+  public static void main(String[] args) {
+    Produkt mehl = new Produkt(1, "Mehl", 2.5, Regalnummer.Regal01);
+    mehl.print();
+
+    Produkt salz = new Produkt(2, "Salz", 3.5, Regalnummer.Regal02);
+    salz.print();
+  }
+}

T01/Aufgabe04/Produkt.java

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+package T01.Aufgabe04;
+
+/**
+ * List with all available shelf numbers.
+ */
+enum Regalnummer {
+  Regal01, Regal02, Regal03, Regal04, Regel05
+}
+
+/**
+ * Class to represent a Produkt.
+ */
+public class Produkt {
+  int id;
+  String name;
+  double nettopreis;
+  Regalnummer regal;
+
+  Produkt(int id, String name, double nettopreis, Regalnummer regal) {
+    this.id = id;
+    this.name = name;
+    this.nettopreis = nettopreis;
+    this.regal = regal;
+  }
+
+  void print() {
+    System.out.printf("%d - %s: %.2f (%s)\n", this.id, this.name, this.nettopreis,
+        this.regal.toString());
+  }
+}

T01/Aufgabe05/ArrayQueue.java

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+package T01.Aufgabe05;
+
+/**
+ * Class to represent a ArrayQueue (using an array).
+ */
+public class ArrayQueue {
+  private Produkt queue[] = new Produkt[100];
+
+  /**
+   * Method to add a product to the Queue.
+   *
+   * @param produkt The product to add.
+   */
+  public void add(Produkt produkt) {
+    for (int i = 0; i < this.queue.length; i++) {
+      if (queue[i] == null) {
+        int j = i;
+        while (j > 0) {
+          queue[j] = queue[j - 1];
+          j--;
+        }
+        break;
+      }
+    }
+    queue[0] = produkt;
+  }
+
+  /**
+   * Method to take a product from the Queue.
+   *
+   * @return The product taken from the Queue.
+   */
+  public Produkt take() {
+    Produkt produkt = queue[0];
+
+    for (int i = 0; i < queue.length; i++) {
+      if (queue[i] == null) {
+        break;
+      }
+      queue[i] = queue[i + 1];
+    }
+    return produkt;
+  }
+}

T01/Aufgabe05/Aufgabe05.java

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+package T01.Aufgabe05;
+
+/**
+ * Teil 1 / Aufgabe 5
+ *
+ * @author Sebastian Brosch
+ */
+public class Aufgabe05 {
+  public static void main(String[] args) {
+
+    System.out.println("\nQueue with Array:");
+
+    ArrayQueue queueA = new ArrayQueue();
+    queueA.add(new Produkt(1, "Salz", 10.0, Regalnummer.Regal01));
+    queueA.add(new Produkt(2, "Zucker", 15.0, Regalnummer.Regal02));
+    queueA.add(new Produkt(3, "Mehl", 10.0, Regalnummer.Regal03));
+
+    queueA.take().print();
+    queueA.take().print();
+    queueA.take().print();
+
+    System.out.println("\nQueue with List:");
+
+    ListQueue queueB = new ListQueue();
+    queueB.add(new Produkt(1, "Salz", 10.0, Regalnummer.Regal01));
+    queueB.add(new Produkt(2, "Zucker", 15.0, Regalnummer.Regal02));
+    queueB.add(new Produkt(3, "Mehl", 10.0, Regalnummer.Regal03));
+
+    queueB.take().print();
+    queueB.take().print();
+    queueB.take().print();
+  }
+}

T01/Aufgabe05/ListQueue.java

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+package T01.Aufgabe05;
+
+import java.util.ArrayList;
+
+/**
+ * Method to represent a Queue (using a List).
+ */
+public class ListQueue {
+  ArrayList<Produkt> queue = new ArrayList<>();
+
+  /**
+   * Method to add a product to the Queue.
+   *
+   * @param produkt The product to add.
+   */
+  public void add(Produkt produkt) {
+    queue.add(0, produkt);
+  }
+
+  /**
+   * Method to take a product from the Queue.
+   *
+   * @return The product taken from the Queue.
+   */
+  public Produkt take() {
+    Produkt produkt = queue.get(0);
+    queue.remove(0);
+    return produkt;
+  }
+}

T01/Aufgabe05/Produkt.java

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+package T01.Aufgabe05;
+
+/**
+ * List with all available shelf numbers.
+ */
+enum Regalnummer {
+  Regal01, Regal02, Regal03, Regal04, Regel05
+}
+
+/**
+ * Class to represent a Produkt.
+ */
+public class Produkt {
+  int id;
+  String name;
+  double nettopreis;
+  Regalnummer regal;
+
+  Produkt(int id, String name, double nettopreis, Regalnummer regal) {
+    this.id = id;
+    this.name = name;
+    this.nettopreis = nettopreis;
+    this.regal = regal;
+  }
+
+  void print() {
+    System.out.printf("%d - %s: %.2f (%s)\n", this.id, this.name, this.nettopreis,
+        this.regal.toString());
+  }
+}