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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