Java中的 YearMonth withMonth() 方法及示例
YearMonth类的withMonth(int month)方法,用于使用作为参数传递的月份来更改 YearMonth 对象的月份,并在该方法之后返回更改后的 YearMonth 的副本。如果月份的日期对指定月份,日期将调整为该月的最后一个有效日期。此实例是不可变的,不受此方法调用的影响。
句法:
public YearMonth withMonth(int month)
参数:此方法接受月份作为参数,该参数是要在返回的年月中设置的年月,从 1(一月)到 12(十二月)。
返回值:此方法根据请求的月份返回基于此年月的 YearMonth。
异常:如果月份值无效,此方法将引发DateTimeException 。
下面的程序说明了 withMonth() 方法:
方案一:
// Java program to demonstrate
// YearMonth.withMonth() method
import java.time.*;
import java.time.temporal.*;
public class GFG {
public static void main(String[] args)
{
// create a YearMonth object
YearMonth yr
= YearMonth.of(2019, 12);
// print instance
System.out.println("YearMonth before"
+ " applying method: "
+ yr);
// apply withMonth method of YearMonth class
YearMonth updatedlocal = yr.withMonth(1);
// print instance
System.out.println("YearMonth after"
+ " applying method: "
+ updatedlocal);
}
}
输出:
YearMonth before applying method: 2019-12
YearMonth after applying method: 2019-01
方案二:
// Java program to demonstrate
// YearMonth.withMonth() method
import java.time.*;
import java.time.temporal.*;
public class GFG {
public static void main(String[] args)
{
// create a YearMonth object
YearMonth yr
= YearMonth.of(2022, 7);
// print instance
System.out.println("YearMonth before"
+ " applying method: "
+ yr);
// apply withMonth method of YearMonth class
YearMonth updatedlocal = yr.withMonth(12);
// print instance
System.out.println("YearMonth after"
+ " applying method: "
+ updatedlocal);
}
}
输出:
YearMonth before applying method: 2022-07
YearMonth after applying method: 2022-12
参考资料: https: Java/time/YearMonth.html#withMonth(int)