1.bounded type

// Bounded type parameter example
class NumberContainer<T extends Number> {
    private T number;

    public NumberContainer(T number) {
        this.number = number;
    }

    public T getNumber() {
        return number;
    }

    public void setNumber(T number) {
        this.number = number;
    }

    public void display() {
        System.out.println("Number: " + number);
    }
}

// Wildcard argument example
class Utils {
    // Method to display elements of a NumberContainer with wildcard argument
    public static void displayNumberContainer(NumberContainer<?> container) {
        System.out.println("Number in container: " + container.getNumber());
    }
}

public class Main {
    public static void main(String[] args) {
        // Bounded type parameter example
        NumberContainer<Integer> intContainer = new NumberContainer<>(10);
        intContainer.display();

        NumberContainer<Double> doubleContainer = new NumberContainer<>(3.14);
        doubleContainer.display();

        // Wildcard argument example
        Utils.displayNumberContainer(intContainer);
        Utils.displayNumberContainer(doubleContainer);
    }
}