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+# Code snippets across topics
+
+## Bank transfers in procedural and object-oriented programming
+* [Procedural programming](../code/procedural_transfer.py)
+* [Object-oriented programming](oop/src/main/java/com/scaler/lld/basics/OopBankAccount.java)
+* [Unit test](oop/src/test/java/com/scaler/lld/basics/OopBankAccountTest.java)
+
+## Object-oriented programming
+### Encapsulation
+* [Default constructor](https://github.com/kanmaytacker/fundamentals/blob/oop-default-ctor/oop/code/oop/src/main/java/com/scaler/lld/scaler/Student.java)
+  * [Unit test](https://github.com/kanmaytacker/fundamentals/blob/oop-default-ctor/oop/code/oop/src/test/java/com/scaler/lld/scaler/StudentTest.java)
+* [Parametrised constructor](https://github.com/kanmaytacker/fundamentals/blob/oop-para-ctor/oop/code/oop/src/main/java/com/scaler/lld/scaler/Student.java)
+  * [Unit test](https://github.com/kanmaytacker/fundamentals/blob/oop-para-ctor/oop/code/oop/src/test/java/com/scaler/lld/scaler/StudentTest.java)
+
+### Inheritance
+* [User - Parent class](https://github.com/kanmaytacker/fundamentals/blob/oop-inheritance/oop/code/oop/src/test/java/com/scaler/lld/scaler/StudentTest.java)
+* [Student - Child class](https://github.com/kanmaytacker/fundamentals/blob/oop-inheritance/oop/code/oop/src/main/java/com/scaler/lld/scaler/Student.java)
+* [Unit Test](https://github.com/kanmaytacker/fundamentals/blob/oop-inheritance/oop/code/oop/src/test/java/com/scaler/lld/scaler/StudentTest.java)
+
+### Polymorphism
+* [Mentor class](https://github.com/kanmaytacker/fundamentals/tree/master/oop/code/oop/src/main/java/com/scaler/lld/scaler)
+* [Subtyping - Mentor and Student as User](https://github.com/kanmaytacker/fundamentals/blob/master/oop/code/oop/src/main/java/com/scaler/lld/App.java#L18)
+* [Method overloading - `printInfo`](https://github.com/kanmaytacker/fundamentals/blob/master/oop/code/oop/src/main/java/com/scaler/lld/scaler/User.java#L26-L31)
+* [Method overriding - Overriding `printInfo` in Student](https://github.com/kanmaytacker/fundamentals/blob/master/oop/code/oop/src/main/java/com/scaler/lld/scaler/Student.java#L34)