java calendar

日历类的getDisplayNames()方法 (Calendar Class getDisplayNames() method)

• getDisplayNames() method is available in java.util package.

  getDisplayNames()方法在java.util包中可用。

• getDisplayNames() method is used to return Map that contains all field names of the calendar will be updated in the given field(fi) values in the given style(st) and Locale(lo).

  getDisplayNames()方法用于返回包含日历所有字段名称的Map，这些日历名称将在给定style(st)和Locale(lo)的给定field(fi)值中更新。

• getDisplayNames() method is a non-static method, it is accessible with the class object and if we try to access the method with the class name then we will get an error.

  getDisplayNames()方法是一个非静态方法，可通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• getDisplayNames() method may throw an exception at the time of returning Map object.

  getDisplayNames()方法在返回Map对象时可能会引发异常。

  • IllegalArgumentException: This exception may throw when the given field(fi) or style(st) are not valid.IllegalArgumentException ：如果给定的field(fi)或style(st)无效，则可能引发此异常。
  • NullPointerException: This exception may throw when the given parameter Locale(lo) is null exists.NullPointerException ：如果给定参数Locale(lo)为null，则可能引发此异常。

Syntax:

句法：

    public Map getDisplayNames(int fi, int st, Locale lo);

Parameter(s):

参数：

• int fi – it represents the field(fi) of this Calendar.

  int fi –它代表此日历的字段(fi)。

• int st – it represents the style that will implemented to the string denotation.

  int st –它表示将对字符串符号实施的样式。

• Locale lo – it represents the locale of the string denotation.

  语言环境lo –它表示字符串符号的语言环境。

Return value:

返回值：

The return type of the method is String, it returns Map object that contains names display in the given style and locale and their desired field(fi) values otherwise it returns null when no string denotation exists.

该方法的返回类型为String ，它返回Map对象，该对象包含以给定样式和语言环境显示的名称以及所需的field(fi)值，否则，当不存在任何字符串符号时，它返回null。

Example:

例：

// Java Program to demonstrate the example of
// Map getDisplayNames() method of Calendar
import java.util.*;
public class GetDisplayNames {public static void main(String args[]) {// Instantiating a Calendar object
Calendar ca = Calendar.getInstance();
// Instantiating a Locale object
Locale lo = Locale.getDefault();
// By using getDisplayNames() method is to
// display the names
Map < String, Integer > m = ca.getDisplayNames(Calendar.DAY_OF_WEEK,
Calendar.LONG, lo);
NavigableMap < String, Integer > nm = new TreeMap < String, Integer > (m);
// Displaying the results
System.out.println(" ca.getDisplayNames(): " + nm);
}
}

Output

输出量

ca.getDisplayNames(): {Friday=6, Monday=2, Saturday=7, Sunday=1, Thursday=5, Tuesday=3, Wednesday=4}

翻译自: https://www.includehelp.com/java/calendar-getdisplaynames-method-with-example.aspx

java calendar