Java Generics - Interview Questions and Answers

Q: What is generics?
Ans : Generics is type safety. Generics code can be written by passing type parameters either to classes, interfaces, methods or to variables. Example:
class A here T is the type parameter
Q: What are the benefits of using generics in java?
Ans: These are the benefits of using generics in java:
1.Stronger type checks at compile time. Fixing compile-time errors is easier than fixing runtime errors, which can be difficult to find.
2.if use generics, the code does not require casting:
List list = new ArrayList();
list.add("Hello World");
String str = list.get(0); // no cast
3.By using generics, programmers can implement generic algorithms that work on collections of different types, can be customized, and are type safe and easier to read.
Q: What is the difference between formal parameter and type parameter?
Ans:formal parameters used in method declarations, type parameters provide a way for you to re-use the same code with different inputs. The difference is that the inputs to formal parameters are values, while the inputs to type parameters are types.