JDeveloper, Java & XML :: Concatenate Strings To Print / Display Vertically

I created a sample application in java which concatenates three strings and displays the result in a final string.

Check the -

public class conCat
{
public static void main (String[] args)
{
String Message1 = "This ";
String Message2 = "is a Sample ";
[code].......

This is a Sample Application

And the three strings are concatenated to the final string "Message" only. How to concatenate them vertically? The required output is :

This is a sample Application