找到唯一的电子

import java.io.IOException;//NowJava.com - 时  代  Java 提 供

import java.util.Iterator;

import java.util.TreeSet;

import java.util.regex.Matcher;

import java.util.regex.Pattern;


public class Main{

  public static void main(String args[]) throws IOException {


    TreeSet<String> ts = new <String>TreeSet();


    String str = "abc@email.com";

    Pattern p = Pattern.compile("[A-Za-z_.]{1,}@[a-z.]*[a-z]{1,3}");

    Matcher m = p.matcher(str);
/*N o w  J a v a  .   c o m 提供*/

    if (m.find()) {

      ts.add(m.group());

    }


    Iterator<String> it = ts.iterator();

    while (it.hasNext()) {

      System.out.print(it.next());