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;
 }
}