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Generic Classes in Java

Generic Classes in Java provide a way to parameterize types, allowing classes to operate on objects of various types while maintaining compile-time type safety. They act as templates that define the functionality of a class, deferring specific type definitions until the class is instantiated by client code^[600-developer-java-java-base-generics.md].

Syntax and Structure

A generic class is defined by placing a type parameter section after the class name. This section is delimited by angle brackets < > and declares the type variables (parameters) for the class^[600-developer-java-java-base-generics.md].

A common convention is to use the single uppercase letter T to represent the Type parameter^[600-developer-java-java-base-generics.md]. The generic type parameter can then be used throughout the class definition to specify the types of fields, return types, and method parameters^[600-developer-java-java-base-generics.md].

For example, the following class defines a generic field key and a method to retrieve it^[600-developer-java-java-base-generics.md]:

class Generic<T> {
    T key;

    public T getKey() {
        return key;
    }
}

Sources

  • 600-developer-java-java-base-generics.md