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diff --git a/java/text/PackageInterfaceExample.typ b/java/text/PackageInterfaceExample.typ
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+#import "/template.typ": *
+#show: A => apply(A)
+#set raw(lang: "java-new")
+#set par(leading: 0.6em)
+
+#assignment(23, block: true)[
+  Write a program that defines an interface with three methods in the `pkgOne` package, implements the interface in a class within the `pkgTwo` package, and from the `main()` method in the working directory, instantiate the class and invoke the interface methods.
+]
+
+#scos("PackageInterfaceExample", include-before: ("pkgOne/MyInterface", "pkgTwo/MyClass"))
+
+=== Discussion
+
+#skind[Interfaces, classes and methods implemented in the program]
+
+- Package `pkgOne`:
+  - Interface `MyInterface`:
+    - `void methodOne()`: An interface method.
+    - `void methodTwo()`: An interface method.
+    - `void methodThree()`: An interface method.
+
+- Package `pkgTwo`:
+  - Class `MyClass` (implements `pkgOne.MyInterface`):
+    - `public void methodOne()`: Implementation of `methodOne` from `MyInterface`.
+    - `public void methodTwo()`: Implementation of `methodTwo` from `MyInterface`.
+    - `public void methodThree()`: Implementation of `methodThree` from `MyInterface`.
+
+- Main program:
+  - Class `PackageInterfaceExample`:
+    - `public static void main(String[])`: Contains the main program creating an object of `MyClass` (which implements `MyInterface`) and calling its methods.
+
+#signature()