What is logging

Logging is a systematic and controlled way of representing the state of an application in a human-readable fashion.

• it is systematic 
• it is controlled
• it represents an application‘s state

evaluating a logging package

• configuration
• flexibility
• output
• ease of use

popular java-based logging APIS

• JDK Logging API
• Apache log4j
• Commons Logging API

What is logging

原文：http://www.cnblogs.com/woodynd/p/4020564.html