Java后台判断是否有中文

import java.util.regex.Matcher;  
import java.util.regex.Pattern;  


public class PatternTest {  

      public static void main(String[] args) {  
        String str = "你好世界 hello world!/にほんご";  
        int chinaCount = 0;  
        Pattern pattern = Pattern.compile("[\u4e00-\u9fa5]");  
        int length = 0;  
        if (str != null) {  
            Matcher aMatcher = pattern.matcher(str);  
            System.out.println("是否有中文：" + (aMatcher.find() ? "有" : "无"));  
            char c[] = str.toCharArray();  
            length = c.length;  
            for (int i = 0; i < length; i++) {  
                Matcher matcher = pattern.matcher(String.valueOf(c[i]));  
                if (matcher.matches()) {  
                    chinaCount++;  
                }  
            }  
        }  
        System.out.println("字符串总个数：" + length);  
        System.out.println("其中中文个数：" + chinaCount);  
        System.out.println("非中文个数：" + (length - chinaCount));  
    }  
}