How to Avoid Creating Objects or Performing Operations That May Not Be Used in java?

Avoid Creating Objects or Performing Operations That May Not Be Used

This mistake occurs most commonly in tracing or logging code that has a flag to turn the operation on or off during runtime. 

Some of this code goes to great lengths creating and formatting output without checking the flag first, creating many objects that are never used when the flag is off. This mistake can be quite expensive, because tracing and logging usually involves many String objects and operations to translate the message or even access to the database to retrieve the full text of the message.

 Large numbers of debug or trace statements in the code make matters worse.