java 根據類名示例化類

即時類from()方法 (Instant Class from() method)

• from() method is available in java.time package.

  from()方法在java.time包中可用。

• from() method is used to return a copy of the Instant from the given TemporalAccessor object.

  from()方法用于從給定的TemporalAccessor對象返回Instant的副本。

• from() method is a static method, it is accessible with the class name and if we try to access the method with the class object then we will not get an error.

  from()方法是一個靜態方法，可以使用類名進行訪問，如果嘗試使用類對象訪問該方法，則不會收到錯誤。

• from() method may throw an exception at the time of returning Instant from the given temp_acc.

  從給定的temp_acc返回Instant時， from()方法可能會引發異常。

  DateTimeException: This exception may throw when the given templ_acc couldn't convert into Instant.

  DateTimeException ：當給定的templ_acc無法轉換為Instant時，可能拋出此異常。

Syntax:

句法：

public static Instant from(TemporalAccessor temp_acc);

Parameter(s):

參數：

• TemporalAccessor temp_acc – represents the temporal accessor to convert to Instant.

  TemporalAccessor temp_acc –表示要轉換為Instant的臨時訪問器。

Return value:

返回值：

The return type of this method is Instant, it returns the Instant that the holds the same value from the given object.

此方法的返回類型為Instant ，它返回Instant，該Instant具有給定對象的相同值。

Example:

例：

// Java program to demonstrate the example // of Instant from(TemporalAccessor temp_acc) // method of Instantimport java.time.*; public class FromOfInstant {public static void main(String args[]) {// Instantiates a OffsetDateTime // and a ZonedDateTime objectOffsetDateTime off_da_time = OffsetDateTime.now();ZonedDateTime zo_da_time = ZonedDateTime.parse("2008-07-06T20:25:30.213+03:00[Africa/Asmara]");// Display off_da_time// and zo_da_timeSystem.out.println("OffsetDateTime off_da_time: ");System.out.println("off_da_time: " + off_da_time);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 creates an Instant// from the given TemporalAccessor i.e.// here we are creating an Instant(ins)// from the given OffsetDateTime(off_da_time)Instant inst = Instant.from(off_da_time);// Display instSystem.out.println("Instant.from(off_da_time): " + inst);// Here, this method creates an Instant// from the given TemporalAccessor i.e.// here we are creating an Instant(ins)// from the given ZonedDateTime(zo_da_time)inst = Instant.from(zo_da_time);// Display instSystem.out.println("Instant.from(zo_da_time): " + inst);} }

Output

輸出量

OffsetDateTime off_da_time: off_da_time: 2020-05-21T22:00:46.891244ZZonedDateTime zo_da_time: zo_da_time: 2008-07-06T20:25:30.213+03:00[Africa/Asmara]Instant.from(off_da_time): 2020-05-21T22:00:46.891244Z Instant.from(zo_da_time): 2008-07-06T17:25:30.213Z

翻譯自: https://www.includehelp.com/java/instant-from-method-with-example.aspx

java 根據類名示例化類

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