DayOfWeek Java 中的 adjustInto()方法，带示例
原文:https://www . geeksforgeeks . org/dayofweek-adjustin to-method-in-Java-with-examples/
java.time.DayOfWeek 的 adjustInto() 方法是 java 中的一个内置函数，它接受一个指定日期的时态对象，并返回一个与输入相同的可观察类型的新时态对象，其中星期几被更改为与指定的 DayOfWeek 常量相同。请注意，此方法在周一到周日的一周内向前或向后调整。
方法声明:
public Temporal adjustInto(Temporal temporal)
语法:
Temporal newLocalDate = DayOfWeek.ANYWEEKDAY.adjustInto(Temporal temporal)
参数:该方法以时态为参数，其中:
-
时态–是需要调整的指定日期。 any weekday–是日期要调整到的指定日期，例如，星期一、星期二等。 newLocalDate – is the modified date.
返回值:该函数返回一个调整后的时态对象，该对象是根据指定的星期几调整的日期。
以下程序说明了上述方法: 程序 1:
```java import java.time.*; import java.time.DayOfWeek; import java.time.temporal.Temporal;
class DayOfWeekExample { public static void main(String[] args) { // Set a Local Date whose day is found LocalDate localDate1 = LocalDate.of(1947, Month.AUGUST, 15);
// Find the day from the Local Date DayOfWeek dayOfWeek1 = DayOfWeek.from(localDate1);
// Printing the Local Date System.out.println(localDate1 + " which is " + dayOfWeek1.name());
// Adjust the Date to Monday from Friday Temporal localDate2 = DayOfWeek.MONDAY .adjustInto(localDate1);
// Find the day from the new Local date DayOfWeek dayOfWeek2 = DayOfWeek.from(localDate2);
// Printing the new Local Date System.out.println(localDate2 + " which is " + dayOfWeek2.name()); } } ```
Output:
```java 1947-08-15 which is FRIDAY 1947-08-11 which is MONDAY
```
程序 2:
```java import java.time.*; import java.time.DayOfWeek; import java.time.temporal.Temporal;
class DayOfWeekExample { public static void main(String[] args) { // Set a Local Date whose day is found LocalDate localDate1 = LocalDate.of(2019, Month.MARCH, 18);
// Find the day from the Local Date DayOfWeek dayOfWeek1 = DayOfWeek.from(localDate1);
// Printing the Local Date System.out.println(localDate1 + " which is " + dayOfWeek1.name());
// Adjust the Date to Wednesday from Monday Temporal localDate2 = DayOfWeek.WEDNESDAY .adjustInto(localDate1);
// Find the day from the new Local date DayOfWeek dayOfWeek2 = DayOfWeek.from(localDate2);
// Printing the new Local Date System.out.println(localDate2 + " which is " + dayOfWeek2.name()); } } ```
Output:
```java 2019-03-18 which is MONDAY 2019-03-20 which is WEDNESDAY
```
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