Java 中的 DayOfWeek plus()方法，带示例

原文:https://www . geesforgeks . org/dayofweek-plus-method-in-Java-with-examples/

java.time.DayOfWeek 的 plus() 方法是 java 中的一个内置函数，它以一个长整数作为参数，并在按照传递的参数所指定的向前或向后前进几天后返回 DayOfWeek 的一个实例。计算从周日到周一在周末进行。指定的时间段可以是正数或负数。

方法声明:

public DayOfWeek plus(long days)

语法:

DayOfWeek dayOfWeekObject = dayOfWeekObject.plus(long days)

参数:该方法以天为参数，其中:

• 天–是向前或向后推进的天数。 dayOfWeekObject* – is an instance of DayOfWeek object.

  返回值:该函数在向前或向后前进几天后返回一个 DayOfWeek 的实例。

  以下程序说明了上述方法: 程序 1:

  ```java // Java Program Demonstrate plus() // method of DayOfWeek import java.time.DayOfWeek;

  class DayOfWeekExample {     public static void main(String[] args)     {         // Getting an instance of DayOfWeek from int value         DayOfWeek dayOfWeek = DayOfWeek.of(2);

  // Printing the day of the week         // and its Int value         System.out.println("Day of the Week : "                            + dayOfWeek.name()                            + " - "                            + dayOfWeek.getValue());

  // Number of days to advance         long adv = 10;

  // Advancing the day         dayOfWeek = dayOfWeek.plus(adv);

  // Printing the day of the week and its         // Int value after adv days         System.out.println("Day of the Week after "                            + adv + " days: "                            + dayOfWeek.name() + " - "                            + dayOfWeek.getValue());     } } ```

  Output:

  ```java Day of the Week : TUESDAY - 2 Day of the Week after 10 days: FRIDAY - 5

  ```

  程序 2:

  ```java // Java Program Demonstrate plus() // method of DayOfWeek import java.time.DayOfWeek;

  class DayOfWeekExample {     public static void main(String[] args)     {         // Getting an instance of DayOfWeek         // from int value         DayOfWeek dayOfWeek = DayOfWeek.of(7);

  // Printing the day of the week         // and its Int value         System.out.println("Day of the Week : "                            + dayOfWeek.name()                            + " - "                            + dayOfWeek.getValue());

  // Number of days to advance         long adv = -3;

  // Advancing the day         dayOfWeek = dayOfWeek.plus(adv);

  // Printing the day of the week and its         // Int value after adv days         System.out.println("Day of the Week after "                            + adv + " days: "                            + dayOfWeek.name()                            + " - "                            + dayOfWeek.getValue());     } } ```

  Output:

  ```java Day of the Week : SUNDAY - 7 Day of the Week after -3 days: THURSDAY - 4

  ```

  参考:https://docs . Oracle . com/javase/8/docs/API/Java/time/dayofweek . html # plus-long-

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