public class Concat
{
    public static void main(String[] args)
    {
       String s1 = "Hello 123";    // Create the first string
       String s2 = " Good-bye ";    // Create the second string
       
       String result;

       result = s1.concat(s2); // String s1 concatenated with string s2
       result = s2.concat(s1); // String s2 concatenated with string s1

       result = s1 + s2;       // String s1 concatenated with string s2
       result = s2 + s1;       // String s2 concatenated with string s1       
    }
}