Generics in Java

Generics in Java — a practical guide to Java generics with clear examples you can reuse in real projects.

Java Tutorial Series (58/90). Prefer one article? Read the complete Java tutorial.

Short description

Generics catch type errors at compile time and remove most casting.

Generic box

class Box<T> {
    private T value;
    void set(T value) { this.value = value; }
    T get() { return value; }
}
Box<String> box = new Box<>();
box.set("Java");