What are some examples of Java generics?

Can you explain what Java generics are with some examples?

Sure! Java generics allow you to define classes, interfaces, and methods with a placeholder for types. For example, you can create a generic class like Box<T> that can hold any type of object.

Can you show me how to use the Box<T> class?

Absolutely! Here's a simple example:

public class Box<T> {
    private T item;

    public void setItem(T item) {
        this.item = item;
    }

    public T getItem() {
        return item;
    }
}

You can use it like this:

Box<String> stringBox = new Box<>();
stringBox.setItem("Hello");
String item = stringBox.getItem(); // Returns "Hello"

What are the benefits of using generics in Java?

Generics provide type safety, eliminate the need for casting, and allow for code reusability. They help catch errors at compile time rather than at runtime.

Can you give me an example of a generic method?

Sure! Here's a generic method that prints an array of any type:

public static <T> void printArray(T[] array) {
    for (T element : array) {
        System.out.println(element);
    }
}

You can call it with any type of array!