Using Contains for objects in List collection

Question

I'm trying to find an object in the List collection by his name using Contains method, but, somehow, it doesn't work. How should I use it?

This is how I try to use this

CandyDao.getAllCandys().contains("Caramel")

But it can't find an object which I need.

CandyDao.java

public class CandyDao {
  private List<Candy> candys = Arrays.asList(new Candy("Caramel", 3, false),
          new Candy("Marmelade", 2, true));

  public List<Candy> getAllCandys(){
    return candys;
  }
}

Candy.java

  public class Candy {
  private String name;
  private float price;
  private boolean InStock;

  public Candy() {
  }

  public Candy(String name, float price, boolean InStock) {
    setName(name);
    setPrice(price);
    setInStock(InStock);
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public float getPrice() {
    return price;
  }

  public void setPrice(float price) {
    this.price = price;
  }

  public boolean getInStock() {
    return InStock;
  }

  public void setInStock(boolean InStock) {
    this.InStock = InStock;
  }
}

Answer 1

Since the list contains Candy objects, the contains() method needs a Candy object for the comparison, so you can't use contains("Caramel").

To check if the list contains a Candy object with a name of "Caramel", you can use Java 8+ Streams to do the search:

CandyDao.getAllCandys().stream().Map(Candy::getName).anyMatch("Caramel"::equals);

The equivalent non-stream version would be:

boolean hasCaramel = false;
for (Candy candy : CandyDao.getAllCandys()) {
    if ("Caramel".equals(candy.getName())) {
        hasCaramel = true;
        break;
    }
}