List<Car> allCars = List.of(...);

// We choose cars where the price is less than 30000
List<Car> resultCars = allCars.stream().filter(item -> item.Price < 30000).toList();

import java.util.List;

class Car
{
     final public String Name;
     final public Integer Price;
     Car(String name, Integer price)
     {
          Name = name;
          Price = price;
     }
}

public class Main {
     public static void main(String[] args) {

          List<Car> allCars = List.of(
                    new Car("Toyota Camry", 25000),
                    new Car("Audi A6", 50000),
                    new Car("Honda Accord", 29000)
          );

          // We choose cars where the price is less than 30000
          List<Car> resultCars = allCars.stream().filter(item -> item.Price < 30000).toList();
          // resultCars[0] = {Name="Toyota Camry", Price=25000}
          // resultCars[1] = {Name="Honda Accord", Price=29000}
     }
}