java提取字符串的汉字

import java.util.regex.Matcher;  
import java.util.regex.Pattern;  
  
  
public class ChineseUtil {  
    private static String regEx = "[\u4e00-\u9fa5]+";   
    public static void main(String[] args) {  
        String str = "abc123ABC好评123我是汉字";  
        if(checkChineseCharacter(str))  
        {  
            System.out.println(returnChineseCharacter(str));  
        }  
       
    }  
      
    public static boolean checkChineseCharacter(String str)  
    {  
        if(str.getBytes().length == str.length())  
            return false;  
        return true;  
    }  
      
    public static String returnChineseCharacter(String str)  
    {  
        Pattern p = Pattern.compile(regEx);   
        Matcher m = p.matcher(str);  
        String chiResult = "";  
        while (m.find()) {  
            chiResult += m.group();  
        }  
        return chiResult;  
    }  
  
}