Java MonthDay with()方法及示例

MonthDay 类的 with(Month month) 方法用于改变MonthDay对象的年月日，使用的是作为参数传递的月份，之后该方法返回改变后的MonthDay副本。如果在改变操作后，指定月份的月日值无效，则该日将被调整为最后的有效月日。

语法

public MonthDay with(Month month)

参数： 该方法接受 月份 作为参数，它是要在返回的月日中设置的年月份。

返回值： 该方法返回一个基于该月日和所要求的月份的月日。

以下程序说明了with()方法：

程序1 :

// Java program to demonstrate
// MonthDay.with() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a MonthDay object
        MonthDay monthday
            = MonthDay.of(8, 28);
  
        // print instance
        System.out.println("MonthDay before"
                           + " applying method: "
                           + monthday);
  
        // apply with method of MonthDay class
        MonthDay updatedlocal
            = monthday.with(Month.OCTOBER);
  
        // print instance
        System.out.println("MonthDay after"
                           + " applying method: "
                           + updatedlocal);
    }
}

输出。

MonthDay before applying method: --08-28
MonthDay after applying method: --10-28

程序2

// Java program to demonstrate
// MonthDay.with() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a MonthDay object
        MonthDay monthday
            = MonthDay.of(10, 31);
  
        // print instance
        System.out.println("MonthDay before"
                           + " applying method: "
                           + monthday);
  
        // apply with method of MonthDay class
        MonthDay updatedlocal
            = monthday.with(Month.FEBRUARY);
  
        // print instance
        System.out.println("MonthDay after"
                           + " applying method: "
                           + updatedlocal);
    }
}

输出。

MonthDay before applying method: --10-31
MonthDay after applying method: --02-29

**参考资料: ** https://docs.oracle.com/javase/10/docs/api/java/time/MonthDay.html#with(java.time.Month)