Java 中的 YearMonth withMonth()方法,带示例

原文:https://www . geesforgeks . org/year month-with month-method-in-Java-with-examples/

with Month(int month)YearMonth类的方法,用于使用作为参数传递的 month 来更改 YearMonth 对象的年中月份,然后该方法返回更改后的 year month 的副本。如果某月某日对于指定月份无效,则该日将被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。

语法:

public YearMonth withMonth(int month)

参数:该方法接受作为参数,该参数是返回的年-月中设置的月份,从 1 月 1 日到 12 月 12 日。

返回值:该方法返回一个基于该年-月的年-月和请求的月。

异常:如果年月值无效,该方法抛出日期时间异常

下面的程序说明了 withMonth()方法: 程序 1:

// 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);
    }
}

Output:

YearMonth before applying method: 2019-12
YearMonth after applying method: 2019-01

程序 2:

// 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);
    }
}

Output:

YearMonth before applying method: 2022-07
YearMonth after applying method: 2022-12

参考文献:https://docs . Oracle . com/javase/10/docs/API/Java/time/year month . html # with month(int)