class Box<T> {
    private T item;

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

    public T getItem() {
        return item;
    }
}

public class Main {
    public static void main(String[] args) {
        Box<Integer> intBox = new Box<>();
        intBox.setItem(123);
        System.out.println("Integer Box: " + intBox.getItem());

        Box<String> strBox = new Box<>();
        strBox.setItem("Hello, Java!");
        System.out.println("String Box: " + strBox.getItem());

        Box<Double> dblBox = new Box<>();
        dblBox.setItem(45.67);
        System.out.println("Double Box: " + dblBox.getItem());
    }
}