用双引号将每个字符串括在逗号分隔的字符串中

Question

我正在处理一个要求，即我需要将单个字符串括在双引号中的逗号分隔字符串中，同时保留空字符串。

例如：字符串 the,quick,brown,,,,,fox,jumped,,,over,the,lazy,dog 应转换为 "the","quick ","brown",,,,,"fox","jumped",,,"over","the","lazy","dog"

我有这段代码有效。但想知道是否有更好的方法来做到这一点。顺便说一句，我在 JDK 8 上。

String str = "the,quick,brown,,,,,fox,jumped,,,over,the,lazy,dog";
//split the string
List<String> list = Arrays.asList(str.split(",", -1));
// add double quotes around each list item and collect it as a comma separated string
String strout = list.stream().collect(Collectors.joining("\",\"", "\"", "\""));
//replace two consecutive double quotes with a empty string
strout = strout.replaceAll("\"\"", "");
System.out.println(strout);

Answer 1

你可以使用split和stream：

public static String covert(String str) {
    return Arrays.stream(str.split(","))
            .map(s -> s.isEmpty() ? s : '"' + s + '"')
            .collect(Collectors.joining(","));
}

然后：

String str = "the,quick,brown,,,,,fox,jumped,,,over,the,lazy,dog";

System.out.println(covert(str));

输出：

"the","quick","brown",,,,,"fox","jumped",,,"over","the","lazy","dog"