Java LocalDateTime adjustInto()用法及代碼示例

LocalDateTime類adjustInto()方法

• adjustInto() 方法可在java.time包。
• adjustInto() 方法用於將此 LocalDateTime 對象調整為給定的 Temporal 對象，或者換句話說，我們可以說調整後的對象具有此對象表示的相同日期和時間。
• adjustInto() 方法是一個非靜態方法，它隻能通過類對象訪問，如果我們嘗試使用類名訪問方法，那麽我們將得到一個錯誤。
• adjustInto() 方法可能會在調整 Date-Time 時拋出異常。
  • DateTimeException - 當給定參數無法調整此 LocalDateTime 時，可能會引發此異常。
  • ArithmeticException - 當計算結果超過此日期的長度時，可能會引發此異常。

用法:

    public Temporal adjustInto(Temporal temp);

參數：

• Temporal temp- 表示要調整此 LocalDateTime 的時間對象。

返回值：

這個方法的返回類型是Temporal，它返回 Temporal 對象，該對象保存將此對象日期時間調整為給定對象的值。

例：

// Java program to demonstrate the example 
// of adjustInto(Temporal temp) method 
// of LocalDateTime

import java.time.*;

public class AdjustIntoOfLocalDateTime {
    public static void main(String args[]) {
        // Instantiates two LocalDateTime
        // and a ZonedDateTime object
        LocalDateTime da_ti1 = LocalDateTime.parse("2005-10-05T10:10:10");
        LocalDateTime da_ti2 = LocalDateTime.now();
        ZonedDateTime zo_da_time = ZonedDateTime.parse("2008-08-08T20:20:20.213+03:00[Africa/Asmara]");

        // Display da_ti1, da_ti2
        // and zo_da_time
        System.out.println("LocalDateTime da_ti1 and da_ti2:");
        System.out.println("da_ti1:" + da_ti1);
        System.out.println("da_ti2:" + da_ti2);
        System.out.println();
        System.out.println("ZonedDateTime zo_da_time:");
        System.out.println("zo_da_time:" + zo_da_time);

        System.out.println();

        // Here, this method adjusts this object
        // into the given object i.e. here we are
        // adjusting this LocalDateTime(da_ti1)
        // into the given object ZonedDateTime(zo_da_time)
        // and the given object is to have same
        // date and time as this object da_ti1
        zo_da_time = (ZonedDateTime) da_ti1.adjustInto(zo_da_time);

        // Display updated zo_da_time
        System.out.println("da_ti1.adjustInto(zo_da_time):" + zo_da_time);

        // Here, this method adjusts this object
        // into the given object i.e. here we are
        // adjusting this LocalDateTime(da_ti2)
        // into the given object ZonedDateTime(zo_da_time)
        // and the given object is to have same
        // date and time as this object da_ti2
        zo_da_time = (ZonedDateTime) da_ti2.adjustInto(zo_da_time);

        // Display updated zo_da_time
        System.out.println("da_ti2.adjustInto(zo_da_time):" + zo_da_time);
    }
}

輸出

LocalDateTime da_ti1 and da_ti2:
da_ti1:2005-10-05T10:10:10
da_ti2:2020-06-04T07:51:48.984048

ZonedDateTime zo_da_time:
zo_da_time:2008-08-08T20:20:20.213+03:00[Africa/Asmara]

da_ti1.adjustInto(zo_da_time):2005-10-05T10:10:10+03:00[Africa/Asmara]
da_ti2.adjustInto(zo_da_time):2020-06-04T07:51:48.984048+03:00[Africa/Asmara]