见到别人的，不太懂

package xiti;

import java.util.Scanner;

public class Sjcj {
	public static void main(String[] args) {
		System.out.println("please input numbers or e-mail");
		Scanner in=new Scanner(System.in);
		String s=in.nextLine();
		System.out.println("e-mail"+" "+s.matches("-?\\w+\\x40\\w+\\x2e\\w+"));
		System.out.println("numbers"+" "+s.matches("-?\\w+"));
 }
}