i use below log format for print my content in logCat
Log.e("Msg","What you have to print");
I use Log.d method also please import import android.util.Log;
Log.d("TAG", "Message");
But please keep in mind that, when you want to see the debug messages then don't use Run As rather use "Debug As" then select Android Application. Otherwise you'll not see the debug messages.
Log.v("blah", "blah blah");
You need to add the android Log view in eclipse to see them. There are also other methods depending on the severity of the message (error, verbose, warning, etc..).
System.out.println() also outputs to LogCat. The benefit of using good old System.out.println() is that you can print an object like System.out.println(object) to the console if you need to check if a variable is initialized or not.
Log.d, Log.v, Log.w etc methods only allow you to print strings to the console and not objects. To circumvent this (if you desire), you must use String.format.
Source: Stackoverflow.com