大家好！下面是老师给的sun的例子，我没改过！ 但是为什么编译不同呢？谢谢大家帮忙看以下！
/*
* Checks for invalid characters
* in email addresses
*/
public class EmailValidation {
public static void main(String[] args)
throws Exception {
try{
String input = "123@sun.com ";
//Checks for email addresses starting with
//inappropriate symbols like dots or @ signs.
Pattern p = Pattern.compile( "^\\.|^\\@ ");
Matcher m = p.matcher(input);
if (m.find())
System.err.println( "Email addresses don 't start " +
" with dots or @ signs. ");