AHHHHHHHHHH COMMITED TO GITHUB INSTEAD OF FORGEJO FOR WEEKS

Code/Steiner/samsung(Interfaces-task)/src/App.java

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+import java.util.ArrayList;
+
+public class App {
+    public static void main(String[] args) throws Exception {
+        ArrayList<Samsung> devices = new ArrayList<Samsung>();
+        devices.add(new GalaxyJ3(11.85, "Phone"));
+        devices.add(new GalaxyS5(12.45, "phone", "sunset-black"));
+
+        for (Samsung samsung : devices) {
+            System.out.println(samsung.preis);
+            System.out.println(samsung.produktTyp);
+            if (samsung instanceof GalaxyS5) {
+                System.out.println(((GalaxyS5) samsung).farbe);
+            }
+            System.out.println("Funktionstest");
+            if (samsung instanceof ITelefon) {
+                ((ITelefon) samsung).powerOn();
+                ((ITelefon) samsung).esKlingelt();
+                ((ITelefon) samsung).anrufen();
+            }
+            System.out.println();
+        }
+    }
+}

Code/Steiner/samsung(Interfaces-task)/src/GalaxyJ3.java

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+public class GalaxyJ3 extends Samsung implements ITelefon {
+
+    public GalaxyJ3(double preis, String produktTyp) {
+        super(preis, produktTyp);
+    }
+
+    @Override
+    public void powerOn() {
+        System.out.println("GalaxyJ3 is starting");
+    }
+
+    @Override
+    public void esKlingelt() {
+        System.out.println("DING DING DING");
+    }
+
+    @Override
+    public void anrufen() {
+        System.out.println("No one will pick up - since you have no signal in the basement");
+    }
+
+}

Code/Steiner/samsung(Interfaces-task)/src/GalaxyS5.java

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+public class GalaxyS5 extends Samsung implements ITelefon {
+    String farbe;
+
+    public GalaxyS5(double preis, String produktTyp, String farbe) {
+        super(preis, produktTyp);
+        this.farbe = farbe;
+    }
+
+    @Override
+    public void powerOn() {
+        System.out.println("GalaxyJ5 is starting");
+    }
+
+    @Override
+    public void esKlingelt() {
+        System.out.println("DING DING DING");
+    }
+
+    @Override
+    public void anrufen() {
+        System.out.println("No one will pick up - since you have no signal in the basement");
+    }
+}

Code/Steiner/samsung(Interfaces-task)/src/ITelefon.java

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+public interface ITelefon {
+    public void powerOn();
+
+    public void esKlingelt();
+
+    public void anrufen();
+}

Code/Steiner/samsung(Interfaces-task)/src/Samsung.java

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+public abstract class Samsung {
+    double preis;
+    String produktTyp;
+
+    public Samsung(double preis, String produktTyp) {
+        this.preis = preis;
+        this.produktTyp = produktTyp;
+    }
+}