Java programming ideas-11th Chapter holding objects

· Container class:

1. Collection:

List, Set, Queue

2. Map

· list<apple> apples = new arraylist<apple> ();

This approach does not always work because some classes have additional functionality, for example, Linklist has additional methods that are not included in the list interface, and TreeMap also has methods that are not included in the map Interface. If you need to use these methods, you cannot turn them up to a more generic interface.

· The Collection.addall () member method can only accept another Collection object as a parameter, so it is not as flexible as arrays.aslist () or Collections.addall (), and both methods use a mutable argument List.

Java programming ideas-11th Chapter holding objects