23 Java Design Patterns of the "behavioral mode" state mode

State Interface Class

public interface State {void handle ();}

Bookedstate class

/** * Booked Status * @author Administrator * */public class Bookedstate implements state {@Overridepublic void handle () {SYSTEM.O Ut.println ("Room has been booked! Nobody else can fix it! ");}}

Checkedinstate class

/** * check-in Status * @author Administrator * */public class Checkedinstate implements state {@Overridepublic void handle () {Syste M.out.println ("Room has been checked in!" Please do not Disturb! ");}}

Freestate class

/** * Idle Status * @author Administrator * */public class Freestate implements state {@Overridepublic void handle () {System.out. println ("Room is FREE!!! No One lives! ");}}

Homecontext class

/** * Room Object * @author Administrator * */public class Homecontext {//If it is a banking system, this context class is an account. Switch between different statuses depending on the amount! Private State state;public void SetState (s) {System.out.println ("Modified status! ") state = S;state.handle ();}}

Client Test class

public class Client {public static void main (string[] args) {Homecontext ctx = new Homecontext (); Ctx.setstate (New Freestat E ()); Ctx.setstate (new Bookedstate ());}}

23 Java Design Patterns of the "behavioral mode" state mode