Why doesn't this method give any output?

I have an ArrayList of objects, and I want to search in that ArrayList keywords, but searching in a specific field of the class. I have the class Product, the ArrayList products and I tried this:

public static void Search (String keywords){
    for (int i = 0; i < products.size(); i++){
        if (products.get(i).getTitle().toLowerCase().contains(keywords.toLowerCase())){
            System.out.println(products.get(i).toString());
        }
    }
}

"Keywords" is a string to search for.
The class Product is this:

 public class Product {

    String title;
    ImageIcon image;

    public String getTitle() {
        return title;
    }

    public Product(String title) {
        this.title = title;
    }
   @Override
   public String toString() {
      return "Product{" + "title=" + title + '}';
   }

I also instanciated some objets of Product, inside a products ArrayList:

ArrayList<Product> products = new ArrayList<>();

products.add(new Product("Car"));
products.add(new Product("House"));
products.add(new Product("Phone"));

And I call the function:

    Search("car");

When I call the method "Search", no output is printed. Why? Thanks!

EDIT: the "toString" method is included in the Product class.

1. If you are not getting any output, it means contains returns false.
2. A cleaner way is to use enhanced for loop.
3. You should follow Java naming conventions e.g. Search should be search as per the naming convention.
4. You should check the variables for null before performing any operation on them.
5. You do not need to call toString() explicitly inside System.out.println as it is implicitly called.

public static void search(String keyword) {
	for (Product product : products) {
		if (keyword != null && product != null && product.getTitle() != null
				&& product.getTitle().toLowerCase().contains(keyword.toLowerCase())) {
			System.out.println(product);
		}
	}
}

Demo:

import java.util.ArrayList;

class Product {
	String title;
	public String getTitle() {
		return title;
	}
	public Product(String title) {
		this.title = title;
	}
	@Override
	public String toString() {
		return "Product{" + "title=" + title + '}';
	}
}

public class Main {
	public static void main(String[] args) {
		ArrayList<Product> products = new ArrayList<>();
		products.add(new Product("Car"));
		products.add(new Product("House"));
		products.add(new Product("Phone"));
		search("car", products);
	}

	public static void search(String keyword, ArrayList<Product> products) {
		for (Product product : products) {
			if (keyword != null && product != null && product.getTitle() != null
					&& product.getTitle().toLowerCase().contains(keyword.toLowerCase())) {
				System.out.println(product);
			}
		}
	}
}

Output:

Product{title=Car}