Web Reference: Nov 22, 2025 · Generics means parameterized types. They allows us to write code that works with different data types using a single class, interface or method. Instead of creating separate versions for each type, we use type parameters (like ) to make the code reusable and type-safe. Why Use Generics? Generics allow you to write classes, interfaces, and methods that work with different data types, without having to specify the exact type in advance. This makes your code more flexible, reusable, and type-safe. JDK 5.0 introduced Java Generics with the aim of reducing bugs and adding an extra layer of abstraction over types. This tutorial is a quick intro to Generics in Java, the goal behind them, and how they can improve the quality of our code.
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