Java中的 YearMonth withYear() 方法及示例

YearMonth类的withYear(int year)方法用于使用作为参数传递的年份更改 YearMonth 对象的年份，然后该方法返回更改后的 YearMonth 的副本。此实例是不可变的，不受此方法调用的影响。

句法：

public YearMonth withYear(int year)

参数：此方法接受月份作为参数，即在返回的年月中设置的年份，从 MIN_YEAR 到 MAX_YEAR。

返回值：此方法根据请求的年份返回基于此年月的 YearMonth。

异常：如果年份值无效，此方法将引发DateTimeException 。

下面的程序说明了 withYear() 方法：
方案一：

// Java program to demonstrate
// YearMonth.withYear() 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 withYear method of YearMonth class
        YearMonth updatedlocal = yr.withYear(2023);
  
        // print instance
        System.out.println("YearMonth after"
                           + " applying method: "
                           + updatedlocal);
    }
}

输出：

YearMonth before applying method: 2019-12
YearMonth after applying method: 2023-12

方案二：

// Java program to demonstrate
// YearMonth.withYear() 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 withYear method of YearMonth class
        YearMonth updatedlocal = yr.withYear(1992);
  
        // print instance
        System.out.println("YearMonth after"
                           + " applying method: "
                           + updatedlocal);
    }
}

输出：

YearMonth before applying method: 2022-07
YearMonth after applying method: 1992-07

参考资料： https: Java/time/YearMonth.html#withYear(int)