eclipse - program won't compile java.lang.ClassNotFoundException -

hi guys total newbie. please me.

the program is:

import java.util.scanner.*; import java.lang.*; public class hextodecimalfromweb{ public static void main (string [] args) {     scanner input = new scanner(system.in);     printheader();     while (true) {         string hex = input.next("enter hexadecimal number: ");         int dec = integer.parseint(hex, 16);         if (dec == sentinel) {             break;         }         system.out.println(hex + " hex = " +            integer.tostring(dec)+ "decimal");     } } private static void printheader() {     system.out.println("this program converts hexadecimal decimal.");    system.out. println("enter 0 stop."); } private static final int sentinel = 0; } 

the error this:

java.lang.noclassdeffounderror: hextodecimalfromweb caused by: java.lang.classnotfoundexception: hextodecimalfromweb @ java.net.urlclassloader$1.run(urlclassloader.java:202) 

what reason that?

i think may issue eclipse other programs won't run either.

this line broken:

 integer.tostring(dec)+decimal"); 

add " ->

 integer.tostring(dec)+"decimal");