英文:
Need help parsing string date
问题
到目前为止，我已经弄清楚了第一个月，但仍需要在日和年份方面寻求帮助。我在解析各个部分并将它们转换为整数方面遇到了困难。
int firstSlash = date.indexOf ("/");
month = Integer.parseInt (date.substring (0, firstSlash));
这是我目前的进展。
英文:
So far I have the first month figured out but I still need help with the day and year. I am having trouble parsing the individual pieces and converting them to integers.
int firstSlash = date.indexOf ("/");
month = Integer.parseInt (date.substring (0, firstSlash));
That is what I have so far.
答案1
得分: 2
简便方法
有一个名为split()的函数，它接受分隔符并返回一个字符串数组：
String[] words = date.split("/");
int month = Integer.parseInt(words[0]);
int day = Integer.parseInt(words[1]);
int year = Integer.parseInt(words[2]);
正确方法
当涉及从字符串解析日期时，首选的方法是使用Java的DateFormat API：
DateFormat format = new SimpleDateFormat("MM/dd/yyyy");
Date theDate = format.parse(date);
Date对象更加强大，可以让您与日期和时间交互比仅使用整数更加流畅。
更多信息，请参见此处！
英文:
Easy way
There is a function called split() that takes the delimiter and returns an array of strings:
String[] words = date.split("/");
int month = Integer.parseInt(words[0]);
int day = Integer.parseInt(words[1]);
int year = Integer.parseInt(words[2]);
Correct way
When it comes to parsing date from string, the preferred way is using Java DateFormat API:
DateFormat format = new SimpleDateFormat("MM/dd/yyyy");
Date theDate = format.parse(date);
Date object is much more powerful and allows you to interact with date and time much more fluently than bare ints
More info here!
答案2
得分: 0
如果您知道您的月份、年份和日期的位置，例如：25/10/2020，您可以直接使用分割函数。
如果您确定日期将以正确的格式出现：
String[] dateSplit = date.split("/");
int day = Integer.valueOf(dateSplit[0]);
int month = Integer.valueOf(dateSplit[1]);
int year = Integer.valueOf(dateSplit[2]);
System.out.println("年：" + year);
System.out.println("月：" + month);
System.out.println("日：" + day);
如果您不确定日期是否会以正确的格式出现：
String[] dateSplit = date.split("/");
if (dateSplit.length != 3) {
throw new Exception("日期格式无效");
// 或者执行其他操作，比如打印等...
}
try {
int day = Integer.valueOf(dateSplit[0]);
int month = Integer.valueOf(dateSplit[1]);
int year = Integer.valueOf(dateSplit[2]);
System.out.println("年：" + year);
System.out.println("月：" + month);
System.out.println("日：" + day);
} catch (NumberFormatException e) {
throw new Exception("日期格式无效");
// 或者执行其他操作，比如打印等...
}
英文:
If you know where are your month, year and day like : 25/10/2020 you can just use the split function
If you are SURE that the date will be in the right format :
String[] dateSplit = date.split("/");
int day = Integer.valueOf(dateSplit[0]);
int month = Integer.valueOf(dateSplit[1]);
int year = Integer.valueOf(dateSplit[2]);
System.out.println("year" + year);
System.out.println("month" + month);
System.out.println("day" + day);
If you are NOT SURE that the date will be in the right format :
String[] dateSplit = date.split("/");
if (dateSplit.length != 3) {
throw new Exception("Date not in valid format");
//or do something else like printing or whatever...
}
try {
int day = Integer.valueOf(dateSplit[0]);
int month = Integer.valueOf(dateSplit[1]);
int year = Integer.valueOf(dateSplit[2]);
System.out.println("year" + year);
System.out.println("month" + month);
System.out.println("day" + day);
} catch (NumberFormatException e) {
throw new Exception("Date not in valid format");
//or do something else like printing or whatever...
}
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