Shulou(Shulou.com)05/31 Report--

This article mainly introduces "what are the characteristics of java state mode". In daily operation, I believe that many people have doubts about the characteristics of java state mode. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "what are the characteristics of java state mode?" Next, please follow the editor to study!

1. Characteristics

The state class has the same public method

The state class has an attribute that points to the entity class that uses this state.

The state class automatically switches states internally, which the user cannot perceive

Used to replace large chunks of recurring if statements

2. Examples

Package com.journaldev.design.state; public class TVStartState implements State {@ Overridepublic void doAction () {System.out.println ("TV is turned ON");} what are the collection classes in Java? the collections in Java are mainly divided into four categories:

1. List list: ordered and repeatable

2. Queue queue: orderly and repeatable

3. Set collection: non-repeatable

4. Map mapping: unordered, key unique, value not unique.

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