Tested the gaptext and used data for Grundlagen

src/Grundlagen.java

@@ -1,3 +1,5 @@
+import javax.swing.JOptionPane;
+
 public class Grundlagen {
     public static void main(String[] args) {
         // Hello World
@@ -27,5 +29,47 @@ public class Grundlagen {
             System.out.println("Durchgang nr. " + anzahlDurchgaenge);
             anzahlDurchgaenge = anzahlDurchgaenge + 1;
         }
+        
+        // Lückentexte / kombination aus variablen, print und if/else
+        // Display a popup dialog and get user input
+
+        // Popups mit User Input
+        String a = JOptionPane.showInputDialog("Please enter a verb (-ing):");
+        String b = JOptionPane.showInputDialog("Please enter a location:");
+        String c = JOptionPane.showInputDialog("Please enter a color:");
+        String d = JOptionPane.showInputDialog("Please enter an object in that color:");
+        String e = JOptionPane.showInputDialog("Please enter a diffrent color:");
+        String f = JOptionPane.showInputDialog("Please enter an object in that color:");
+        String g = JOptionPane.showInputDialog("Please enter an adjective:");
+        String h = JOptionPane.showInputDialog("Please enter an object");
+
+        // Error message
+        
+        if ((a == null || a.trim().isEmpty()) && (b == null || b.trim().isEmpty())) {
+            System.out.println("Missing word(s) or canceled.");
+        } else if (a == null || a.trim().isEmpty()) {
+            System.out.println("Missing word(s) or canceled.");
+        } else if (b == null || b.trim().isEmpty()) {
+            System.out.println("Missing word(s) or canceled.");
+        } else if (c == null || c.trim().isEmpty()) {
+            System.out.println("Missing word(s) or canceled.");
+        } else if (d == null || d.trim().isEmpty()) {
+            System.out.println("Missing word(s) or canceled.");
+        } else if (e == null || e.trim().isEmpty()) {
+            System.out.println("Missing word(s) or canceled.");
+        } else if (f == null || f.trim().isEmpty()) {
+            System.out.println("Missing word(s) or canceled.");
+        } else if (g == null || g.trim().isEmpty()) {
+            System.out.println("Missing word(s) or canceled.");
+        } else if (h == null || h.trim().isEmpty()) {
+            System.out.println("Missing word(s) or canceled.");
+        } else {
+
+            // Lückentext mit variablen
+
+            System.out.println("They where " + a + " throw a " + b + ". They're eyes where ");
+            System.out.println(c + " as the " + d + " They're hair as " + e + " as " + f + ".");
+            System.out.println("It was a " + g + " day, after a long journey they finally found their " + h);
+        }
     }
 }

src/Testcode.java

@@ -4,6 +4,7 @@ import javax.swing.JOptionPane;
 
 public class Testcode {
     public static void main(String[] args) {
+       
         System.out.println("A code request you have made,");
         System.out.println("Fear not, for I am here to aid.");
         System.out.println("In Java, a language so grand,");
@@ -23,7 +24,7 @@ public class Testcode {
 
         int sum = x + y + z;
 
-        System.out.println("The sum of " + x + " " + y + " and " + z + " is: " + sum);
+        System.out.println("The sum of " + x + ", " + y + " and " + z + " is: " + sum);
 
         System.out.println("May the code be with you!");