Complete all Java assignments

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diff --git a/java/text/RuntimePolymorphismExample.typ b/java/text/RuntimePolymorphismExample.typ
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+#import "/template.typ": *
+#show: A => apply(A)
+#set raw(lang: "java-new")
+#set par(leading: 0.7em)
+
+#assignment(21)[
+  Write a program, wherein create an Interface and create two sub-classes implementing the interface to show the functionalities of runtime polymorphism (_a.k.a._ dynamic method dispatch) using them.
+]
+
+#scos("RuntimePolymorphismExample")
+
+=== Discussion
+
+#skind[Interfaces, classes and methods implemented in the program]
+
+- Interface `Shape`:
+  - `void draw()`: Declares a method.
+
+- Class `Circle` (implements `Shape`):
+  - Implements the `draw()` method from the `Shape` interface.
+  - Method `void calculateArea()`: Declares a specific method for calculating the area of a circle.
+
+- Class `Square` (implements `Shape`):
+  - Implements the `draw()` method from the `Shape` interface.
+  - Method `void calculateArea()`: Declares a specific method for calculating the area of a square.
+
+- Class `RuntimePolymorphismExample`:
+  - `public static void main(String[])`: Contains the main program demonstrating runtime polymorphism by creating objects of subclasses (`Circle` and `Square`) and calling the `draw()` method dynamically.
+
+  
+#signature()