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diff --git a/java/text/InterfaceExample.typ b/java/text/InterfaceExample.typ
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+#import "/template.typ": *
+#show: A => apply(A)
+#set raw(lang: "java-new")
+#set par(leading: 0.5em)
+
+#assignment(20, block: true)[
+  Write a program in which create two interfaces, each with two methods, inherit a new interface from the two, adding a new method, create a class by implementing the new interface and also inheriting a concrete class. In the `main()` method, create an object of the derived class and call these methods.
+]
+
+#scos("InterfaceExample")
+
+=== Discussion
+
+#skind[Interfaces, classes and methods implemented in the program]
+
+- Interface `Interface1`:
+  - `void method1()`: Declares a method.
+  - `void method2()`: Declares another method.
+
+- Interface `Interface2`:
+  - `void method3()`: Declares a method.
+  - `void method4()`: Declares another method.
+
+- Interface `NewInterface` (extends `Interface1` and `Interface2`):
+  - Inherits methods from `Interface1` and `Interface2`.
+  - `void newMethod()`: Declares a new method.
+
+- Class `ConcreteClass`:
+  - Method `void concreteMethod()`: Declares a method.
+
+- Class `DerivedClass` (extends `ConcreteClass` and implements `NewInterface`):
+  - Implements methods from `Interface1`, `Interface2`, and `NewInterface`.
+  - Method `void concreteMethod()`: Inherits and overrides a method.
+
+- Class `InterfaceExample`:
+  - `public static void main(String[])`: Contains the main program, creating an instance of `DerivedClass` and calling various methods.
+
+  
+#signature()