Android App: How can I print out a String with java code?

I am very new to Android programming!

I want to do something really simple:

`if(i < 1) 
    System.out.println("Ja");
 else
    System.out.println("Nein");`

My first idea how to achieve this was to have a TextView in xml with a String resource and then acess that resource via Java code (R.string.Entscheidung = "Ja";) but it doesnt work. Is there another easy way to do this?

Thank you !