wkdalsgh192 · September 8, 2021 01:25
diff --git a/firstClassCollection4.java b/firstClassCollection4.java
 public class Orders {
  private final List<Order> orders;
  
  public Orders(List<Order> orders) {
    this.orders = orders;
  }
  
  public long getAmountSum() {
    return orders.stream()
                  .mapToLong(Order::getAmount)
                  .sum();
  }

 }
	public class Orders {
	private final List<Order> orders;

	public Orders(List<Order> orders) {
	this.orders = orders;
	}

	public long getAmountSum() {
	return orders.stream()
	.mapToLong(Order::getAmount)
	.sum();
	}

	}