Generic programming enables developers to create flexible, reusable functions that can work with any valid data type. This is achieved by adjusting our existing code in a way that still maintains type safety. In essence, generics allow us to define c...

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Shai Almog
Yak Barber, duck whisperer, hunter of bugs, feeder of dogs, heap climber, stack explorer and rider of shells
Nicely said. I would also add a paragraph about erasure. Essentially, that first code without generics would still compile today and produce some warnings, but work as expected.
Technically, generic code compiles to something pretty similar. The generic data is erased so code like this is legal:
private void myMethod(List<MyObject> data) { List myList = (List)data; //... }