how to output user message into the console?

does not anyone know?

There are 3 basic methodologies

1. Using streams
2. Using a scanner
   
   • introduced in Java 5
     
3. Using the Console class
   
   • introduced in Java6
   • Will not work when the code is run from within an IDE (since the IDE does not have a console)

Here are some links to a few tutorials that will show you how to do this. The frist two are from the "official" Java Tutorial.

• http://docs.oracle.com/javase/tutorial/essential/io/cl.html
• http://docs.oracle.com/javase/tutorial/essential/io/scanning.html
• http://codeved.com/java/java-input-output/console-read-write-java-io/
• http://www.mkyong.com/java/how-to-read-input-from-console-java/
• http://www.cs.carleton.edu/faculty/dmusican/cs117s03/iocheat.html
  

Eventually you will want to look at using a logging framework such as Simple Logging Facade for Java (SLF4J) over Logback rather than the console.

maybe I did not make it clear,i means than how to output the user message into the console of intellij,it is intellij's console,not system console