Enumeration of Java Foundations

1. External configuration files are used in multiple methods in a project, so you want to write a singleton pattern to read an external configuration file, instead of reading it every time you use it

Enumeration implementation of the Singleton mode, other modes see http://www.cnblogs.com/predisw/p/4763513.html

 Public enumSingletonpropsbyenum {INSTANCE; PrivateProperties Properties; PrivateInputStream in; PrivateSingletonpropsbyenum () { in= This. GetClass (). getResourceAsStream ("/system.properties");//Note that this cannot be changed to the form of a parameter!!!, because it is initialized once.Properties =NewProperties (); }         PublicProperties getProperties ()throwsioexception{properties.load (in); returnproperties; }}

2. Why are enumeration types thread-safe?

3. Enumeration uses some of the features

Enumeration of Java Foundations