java - 。之前和之后()

Question

我一直在尝试编写一个程序，该程序必须查看 csv 文件中的某个时间是在某些值之后还是之前。但是，我收到以下错误:

javaFiles\testing.java:116: error: cannot find symbol
                                        boolean before = result.format(formatter).before(calc);
                                                                                 ^
  symbol:   method before(LocalTime)
  location: class String
javaFiles\testing.java:117: error: cannot find symbol
                                        boolean after = result.format(formatter).after(calc2);
                                                                                ^
  symbol:   method after(LocalTime)
  location: class String

这是给出问题的代码:

LocalTime calc = LocalTime.parse("06:00", formatter);
LocalTime calc2 = LocalTime.parse("17:30", formatter);

//before and after , if true its night
boolean before = result.format(formatter).before(calc);
boolean after = result.format(formatter).after(calc2);

完整代码请参见https://pastebin.com/5EGurJig所以我不必在这里发送垃圾邮件

Answer 1

我不知道变量 result 属于哪个类，但您正在对 String 调用 before 和 after，因为format 调用是一个字符串。因此，如果 result 也是 LocalDate ，您可以使用:

boolean before = result.isBefore(calc);
boolean after = result.isAfter(calc2);