Java tutorial
public class MainClass { public static void main(String args[]) { String s1 = new String("Happy "); String s2 = new String("Birthday"); System.out.printf("s1 = %s\ns2 = %s\n\n", s1, s2); System.out.printf("Result of s1.concat( s2 ) = %s\n", s1.concat(s2)); System.out.printf("s1 after concatenation = %s\n", s1); } // end main }