Answer 1

Code that uses generics has many benefits over non-generic code: Stronger type checks at compile time. A Java compiler applies strong type checking to generic code and issues errors if the code violates type safety. Fixing compile-time errors is easier than fixing runtime errors, which can be difficult to find.
https://docs.oracle.com/javase/tutorial/java/generics/why.html
https://stackoverflow.com/questions/16689477/type-safety-with-generics-in-java
https://stackoverflow.com/questions/16689477/type-safety-with-generics-in-java