Java Calendar.WEEK_OF_YEAR 返回该月中的第几周

Question

/* package whatever; // don't place package name! */
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone {

    public static void main (String[] args) throws java.lang.Exception {
        try {
            // your code goes here
            SimpleDateFormat sdf= new SimpleDateFormat("dd-mm-yyyy");
            Calendar cal= Calendar.getInstance();
            String s = "12-12-2014";
            Date dte=sdf.parse(s);
            cal.setTime(dte);

            System.out.println( cal.get(Calendar.WEEK_OF_YEAR)+"");
        } catch (Exception e ) {}
    }
}

输出为 3。

我正在尝试从给定日期获取一年中的第几周。我引用了 java 文档，但 WEEK_OF_YEAR 应该在 50 中。

Answer 1

您的 SimpleDateFormat 错误，请参阅 JavaDoc :

Letter | Date or Time | Component | Presentation | Examples

m | Minute in hour | Number | 30

应该是:

SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");