abhinav-nath / java-generics

All about Generics in Java

Generics

Generics enable types to be parameters when defining classes and methods and with that you can re-use the same code with different inputs (types).

This class can store a String, an Integer or any Custom object. The purpose of this Box is to re-use it for any kind of data.

public class Box<T> {
    private T type;

    public void set(T type) {
        this.type = type;
    }

    public T get() {
        return type;
    }

    // T is a type parameter
}

Box<String> favoriteColor = new Box<>();
favoriteColor.set("BLACK");
favoriteColor.set(10); // compilation error

Box<Integer> favoriteNumber = new Box<>();
favoriteNumber.set(27);

Box<Animal> favoriteAnimal = new Box<>();
favoriteAnimal.set("Tiger");

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• Motivation behind Generics
• Generics Terminology
• Type Inference
• Generics Restrictions

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