how to find a 'carriage return' and loop back to main until user enters a string

[hopes]

excuse me, simple question
I want a user to enter a string so that I may recursively call it to reverse it.
Just one thing, i wanna make sure the user did not enter a carriage return, if he/she did, it will loop and ask them to enter a string again. Basically error prevention. So I tried a while (x=="\n") or "" or "\r" where x is my string..it did not do anything. BTW i am using Eclipse.
So basically how can i do a loop in main that will keep asking user for a string and checking whether or not he enterd a "Enter"
Thanks ahead of time.

The prog:
*************** *************** ****

import java.io.*;
import java.util.Scann er;
public class stringreverse
{

public static void stringreversed( String s, int n)
{
if (n==0){
System.out.prin t("you entered nada");
return;}
else{

System.out.prin t(s.charAt(n-1));
stringreversed( s,n-1);
}
}

public static void main(String[] args)
{
Scanner scan = new Scanner(System. in);
System.out.prin t("What do you want to reverse? ");
int t;
String x = scan.next();
while (x !="")
{
t = x.length();

stringreversed( x,t);
}

else
System.out.prin t("You entered an empty string,try again");
//want it to loop back to main here until a string is entered









}
}

[jkmyoung]

use the nextLine() function if you're looking for line by line input as opposed to word by word input.

scan.next(); will never return "" unless you have changed the input delimiters.