Java中的 DayOfWeek getDisplayName() 方法及示例

Java .time.DayOfWeek的getDisplayName()方法是Java中的一个内置函数，它根据指定的Locale 类参数和TextStyle 返回星期几的文本表示。 TextStyle 定义了三个元素“FULL”、“SHORT”和“NARROW”。 Locale 类代表世界的特定语言和区域。

方法声明：

public String getDisplayName(TextStyle style, Locale locale)

句法：

String text = dayOfWeekObject.getDisplayName(TextStyle style, Locale locale)

参数：此方法有两个参数：

style – 是 TestStyle，可以是三个元素 'FULL'、'SHORT' 和 'NARROW'。

locale - 代表世界的特定语言和地区。默认语言环境是美国

dayOfWeekObject – 是 DayOfWeek 的一个实例。

返回值：函数返回根据指定的Locale 类参数和TextStyle 返回星期几的文本表示。

下面的程序说明了上述方法：
方案一：

// Java Program Demonstrate getDisplayName()
// method of DayOfWeek
  
import java.time.*;
import java.time.format.TextStyle;
import java.util.Locale;
  
class DayOfWeekExample {
    public static void main(String[] args)
    {
        // Initializing a DayOfWeek instance
        DayOfWeek dayOfWeek = DayOfWeek.MONDAY;
  
        // Get textual representation of the
        // day-of-week in FULL style
        String full_name
            = dayOfWeek
                  .getDisplayName(TextStyle.FULL,
                                  Locale.getDefault());
  
        // Get textual representation of the
        // day-of-week in SHORT style
        String short_name
            = dayOfWeek
                  .getDisplayName(TextStyle.SHORT,
                                  Locale.getDefault());
  
        // Get textual representation of the
        // day-of-week in NARROW style
        String narrow_name
            = dayOfWeek
                  .getDisplayName(TextStyle.NARROW,
                                  Locale.getDefault());
  
        // Printing the textual names of the day-of-week
        System.out.println(full_name);
  
        System.out.println(short_name);
  
        System.out.println(narrow_name);
    }
}

输出：

Monday
Mon
M

方案二：

// Java Program Demonstrate getDisplayName()
// method of DayOfWeek
  
import java.time.*;
import java.time.DayOfWeek;
import java.time.format.TextStyle;
import java.util.Locale;
  
class DayOfWeekExample {
    public static void main(String[] args)
    {
        // Initializing a DayOfWeek instance
        DayOfWeek dayOfWeek = DayOfWeek.WEDNESDAY;
  
        // Get textual representation of the
        // day-of-week in FULL style
        String full_name
            = dayOfWeek
                  .getDisplayName(TextStyle.FULL,
                                  Locale.getDefault());
  
        // Get textual representation of the
        // day-of-week in SHORT style
        String short_name
            = dayOfWeek
                  .getDisplayName(TextStyle.SHORT,
                                  Locale.getDefault());
  
        // Get textual representation of the
        // day-of-week in NARROW style
        String narrow_name
            = dayOfWeek
                  .getDisplayName(TextStyle.NARROW,
                                  Locale.getDefault());
  
        // Printing the textual names of the day-of-week
        System.out.println(full_name);
  
        System.out.println(short_name);
  
        System.out.println(narrow_name);
    }
}

输出：

Wednesday
Wed
W

参考： https: Java/time/DayOfWeek.html#getDisplayName-java.time.format.TextStyle-java.util.Locale-