Family Day update

Task/Abstract-type/Vala/abstract-type.vala

@@ -0,0 +1,29 @@
+public abstract class Animal : Object {
+  public void eat() {
+    print("Chomp! Chomp!\n");
+  }
+
+  public abstract void talk();
+}
+
+public class Mouse : Animal {
+  public override void talk() {
+    print("Squeak! Squeak!\n");
+  }
+}
+
+public class Dog : Animal {
+  public override void talk() {
+    print("Woof! Woof!\n");
+  }
+}
+
+void main() {
+  Dog mike = new Dog();
+  Mouse scott = new Mouse();
+
+  mike.talk();
+  mike.eat();
+  scott.talk();
+  scott.eat();
+}