Functional interfaces with lambda expressions Pre-work

Expected time required: 15 min

In this scenario, you are processing a list of orders to determine which orders contain only one item so that item picking and packaging can be done without human intervention. You have a list of orders, each order is a list of items. You must remove any orders that contain more than one item. List contains a method removeIf that accepts a Predicate interface as an argument. Implement the checkOrders method of ShippingHelper using a lambda expression for the input argument for removeIf.

1. Implement the checkOrders method of ShippingHelper. Use List's removeIf method to check if orders contain only one item. Pass an inline lambda expression to removeIf that implements the Predicate functional interface. The method removeIf will remove the item from the List if the condition evaluates to true. Therefore, the lambda expression should return true if the order has more than one item.

HINTS:

• Error: Conditional logic can be removed