java month_Java MonthDay withMonth()用法及代码示例

MonthDay类的withMonth(int month)方法用于将传递的month用作参数来更改MonthDay对象的month-of-year，然后该方法返回更改后的MonthDay的副本。如果day-of-month对于指定的月份无效，则将调整日期到最后一个有效的day-of-month。此实例是不可变的，不受此方法调用的影响。

用法:

public MonthDay withMonth(int month)

参数：此方法接受月份作为参数，即month-of-year，以将其设置在返回的month-day中，从1月(1月)到12月(12月)。

返回值：此方法返回基于此month-day的MonthDay以及所请求的月份。

异常：如果month-of-year值无效，则此方法引发DateTimeException。

以下示例程序旨在说明withMonth()方法：

示例1:

// Java program to demonstrate

// MonthDay.withMonth() 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 withMonth method of MonthDay class

MonthDay updatedlocal = monthday.withMonth(1);

// print instance

System.out.println("MonthDay after"

+ " applying method: "

+ updatedlocal);

}

}

输出：

MonthDay before applying method: --08-28

MonthDay after applying method: --01-28

示例2:

// Java program to demonstrate

// MonthDay.withMonth() 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 withMonth method of MonthDay class

MonthDay updatedlocal = monthday.withMonth(5);

// print instance

System.out.println("MonthDay after"

+ " applying method: "

+ updatedlocal);

}

}

输出：

MonthDay before applying method: --10-31

MonthDay after applying method: --05-31