It may never be necessary to make your own iterator because many languages now provide built-in iterators. This video checks one of them out.
- [Instructor] Java offers a built-in iterator interface. … Java.util.iterator. … We can use this interface … instead of building our own if we want to. … The java.util.iterator interface acts both … as an interface that your own iterator classes … can implement as well as the type … of the Java collection classes built-in iterators. … Classes like ArrayList, Vector and LinkedList … all have an iterator method that returns … a ready built iterator with a type java.util.iterator. … Now if you're asking, well, … why did we build our own iterator for the diner menu? … Well, we wanted you to see how to create an iterator … from scratch, but now that you know how to do that, … you should also know how to use … the built-in iterator interface … and the collection iterators. … It's worth noting that Java arrays … don't have built-in iterators in the same way … the collection classes do. … So building an iterator for an array or custom collection … is a good way to see how the iterator pattern works. …
- What are design patterns?
- Encapsulating code that varies with the Strategy pattern
- The limitations of inheritance
- Using the Adapter pattern
- Implementing the Observer pattern
- Extending behavior with composition and the Decorator pattern
- Encapsulating iteration with the Iterator pattern
- Object creation with the Factory Method pattern
- Using design principles to guide your object-oriented design
Skill Level Intermediate
1. Design Patterns
2. The Strategy Pattern
3. The Adapter Pattern
4. The Observer Pattern
Using the Observer pattern2m 23s
5. The Decorator Pattern
6. The Iterator Pattern
7. The Factory Patterns
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