java字符串分割split你用对了吗

split() 方法根据匹配给定的正则表达式来拆分字符串。

注意： . 、 $、 | 和 * 等转义字符，必须得加 \。

注意：多个分隔符，可以用 | 作为连字符。

public String[] split(String regex, int limit)

• regex -- 正则表达式分隔符。

• limit -- 分割的份数。

字符串数组。

如下示例，猜猜答案吧

    private static void test01() {
        String str1="a";
        String str2="a,b";
        String str3="a,b,";
        String str4="a,b, ";
        String str5=",,,,,,";
        String[] split1 = str1.split(",");
        String[] split2 = str2.split(",");
        String[] split3 = str3.split(",");
        String[] split4 = str4.split(",");
        String[] split5 = str5.split(",");
        System.out.println("str1分割后："+JSON.toJSONString(split1));
        System.out.println("str2分割后："+JSON.toJSONString(split2));
        System.out.println("str3分割后："+JSON.toJSONString(split3));
        System.out.println("str4分割后："+JSON.toJSONString(split4));
        System.out.println("str5分割后："+JSON.toJSONString(split5));
    }

结果

str1分割后：["a"]
str2分割后：["a","b"]
str3分割后：["a","b"]
str4分割后：["a","b"," "]
str5分割后：[]

 private static void test02() {
        String str1="a";
        String str2="a,b";
        String str3="a,b,";
        String str4="a,b, ";
        String str5=",,,,,,";
        String[] split1 = str1.split(",",2);
        String[] split2 = str2.split(",",2);
        String[] split3 = str3.split(",",2);
        String[] split4 = str4.split(",",2);
        String[] split5 = str5.split(",",2);
        System.out.println("str1分割后："+JSON.toJSONString(split1));
        System.out.println("str2分割后："+JSON.toJSONString(split2));
        System.out.println("str3分割后："+JSON.toJSONString(split3));
        System.out.println("str4分割后："+JSON.toJSONString(split4));
        System.out.println("str5分割后："+JSON.toJSONString(split5));
    }

结果 

str1分割后：["a"]
str2分割后：["a","b"]
str3分割后：["a","b,"]
str4分割后：["a","b, "]
str5分割后：["",",,,,,"]