State management of Java design patterns

definition : Allows an object to change its behavior when its internal state changes. The object appears to have modified its class.

Nature : Separates and chooses behavior according to state.

State : The property value of the object instance.

behavior : The function of an object is mostly mapped to a method.

the function of State mode : The behavior of separating state, by maintaining the change of state, to invoke different functions corresponding to different states.

States and behaviors are associated and can be described as: state-determined behavior .

(1) Defining State enumerations

public enum Magicstate {lock,download, downloading, PROCESS, processing, sound};

　　

(2) Setting status

public void SetState (Magicstate state) {this.state = state};

　　

(3) Adding a method to a state

private void Switchmagicstate (Magicstate ms) {LOGGING.D (TAG, "switchmagicstate|ms =" + ms); mmagictask.state = Ms;switch ( MS) {case LOCK:                        //.......lock related methods break;case download:break;case downloading:break;case process:break;case Processing:break;case Sound:break;default:break;}}

　　

(4) Toggle Status

State management of Java design patterns