Java Language Generics Benefits of Generic class and interface


Code that uses generics has many benefits over non-generic code. Below are the main benefits

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.

Elimination of casts

The following code snippet without generics requires casting:

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

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

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

Enabling programmers to implement generic algorithms

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.