各種開發語言的console output

Java:  

System.out.println

asp.net:

System.Diagnostics.Debug.WriteLine(...)

it shows results in the Output window of Visual Studio

http://stackoverflow.com/questions/137660/where-does-console-writeline-go-in-asp-net

rails

http://stackoverflow.com/questions/5673584/puts-doesnt-print-stuff-to-console

Ojbective C

NSLog

Android 

Log.info(...)