Benefit of using Generics in Java

 Generics enable types (classes and interfaces) to be parameters when defining classes, interfaces and methods.

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 run-time errors, which can be difficult to find.

             

• Elimination of casts.
  The following code snippet without generics requires casting:

  List list = new ArrayList();
  list.add("hello");
  String s = (String) list.get(0);
  

  When re-written to use generics, the code does not require casting:

  List<String> list = new ArrayList<String>();
  list.add("hello");
  String s = list.get(0);   // no cast