no type casting needed, avoids ClassCastException list1.add(new Integer(5)) //compiler error
List list1 = new ArrayList() // java 7 ? List list1 = new ArrayList() After Java 5, we use collection classes like below.
type casting leading to ClassCastException at runtimeĪbove code compiles fine but throws ClassCastException at runtime because we are trying to cast Object in the list to String whereas one of the element is of type Integer. Let’s see how generics help us using collection classes safely. The whole collection framework was re-written to use generics for type-safety. Generics was added in Java 5 to provide compile-time type checking and removing risk of ClassCastException that was common while working with collection classes. We will look into below topics of generics in java. Understanding generics can become confusing sometimes if we go with jargon words, so I would try to keep it simple and easy to understand. We will try to learn the features of generics in this article. Generics in Java with collection classes is very easy but it provides a lot more features than just creating the type of collection. If you have been working on Java Collections and with version 5 or higher, I am sure that you have used it. Java Genrics is one of the most important features introduced in Java 5.
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