java中判断字段真实长度的实例(中文2个字符,英文1个字符)

public class Char_cn {  public static void main(String[] args) { // TODO Auto-generated method stub String haha = "我叫兜兜abcd"; int true_num = String_length(haha); System.out.println("true" + true_num); int false_num = haha.length(); System.out.print("flase" + false_num); } public static int String_length(String value) { int valueLength = 0; String chinese = "[/u4e00-/u9fa5]"; for (int i = 0; i < value.length(); i++) {  String temp = value.substring(i, i + 1);  if (temp.matches(chinese)) {  valueLength += 2;  } else {  valueLength += 1;  } } return valueLength; }}