Java中怎么计算中英文的长度

package org.web.server;

import java.io.UnsupportedEncodingException;
/**
 * 怎么计算中英文字符串的长度
 * @author lKF19306
 *
 */
public class StringTest {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  String aString = "这是一个测试串，This is a test string";
  
  String anotherString = null;
  
  try {
   anotherString = new String(aString.getBytes("GBK"),"ISO8859_1");
  } catch (UnsupportedEncodingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  System.out.println(aString.length()+","+anotherString.length());
 }

}