java List 操作

java stream 字符串转换顺便记录一下。

列表转换及字符串 joining

 List<?> pathCodes = (List<?>) params.get("pathCodes");
String pathCodeLikeWhere = pathCodes
                .stream()
                .map(obj -> String.format("Ancestor LIKE '%s%%'", obj))
                .collect(Collectors.joining(" OR ", "(", ")"));

// 结果："(Ancestor LIKE 'xxx%' OR Ancestor LIKE 'xxxxx%')"