在下面的代码中 输入:
Enter Date: 3/2/2011
输出:
Entered Date is February 3, 2011
Entered Month is 02
问题是,当我输入这个日期3/14/2012
时,日期格式函数会自动将月份更改为12+2
(二月)。如果我输入 13/15/2011
,它会将月份更改为 3(12+3)
。
它应该在 14
上给出错误,“月份无效”
package lesson4;
import java.util.*;
import java.text.*;
public class ConvertDate {
static String Month;
static String fulldate;
static int month;
static int[] montharray={1,2,3,4,5,6,7,8,9,10,11,12};
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.print("Enter Date: ");
String ind = sc.nextLine();
//Date now = new Date();
DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
SimpleDateFormat f = new SimpleDateFormat("dd");
SimpleDateFormat m = new SimpleDateFormat("MM");
Date d = null;
Date e=null;
Date g=null;
try {
d=df.parse(ind);
e=df.parse(ind);
g=df.parse(ind);
DateFormat df3 = DateFormat.getDateInstance(DateFormat.LONG);
fulldate = df3.format(d);
Month=m.format(g);
month =Integer.parseInt(Month);
String date =f.format(e);
} catch (ParseException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println("The entered date is: " + fulldate);
System.out.println("The entered month is: " + Month);
}
}
最佳答案
对于每个 DateFormat
实例,您需要使用 false 参数调用 setLenient
:
DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
df.setLenient(false);
DateFormat f = new SimpleDateFormat("dd");
f.setLenient(false);
DateFormat m = new SimpleDateFormat("MM");
m.setLenient(false);
来自DateFormat#setLenient(boolean)
文档:
With lenient parsing, the parser may use heuristics to interpret inputs that do not precisely match this object's format. With strict parsing, inputs must match this object's format.
关于Java日期转换,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18011004/