java 根據(jù)類(lèi)名示例化類(lèi)

即時(shí)類(lèi)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(duì)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(gè)靜態(tài)方法，可以使用類(lèi)名進(jìn)行訪問(wèn)，如果嘗試使用類(lèi)對(duì)象訪問(wèn)該方法，則不會(huì)收到錯(cuò)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(shí)， from()方法可能會(huì)引發(fā)異常。

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

  DateTimeException ：當(dāng)給定的templ_acc無(wú)法轉(zhuǎn)換為Instant時(shí)，可能拋出此異常。

Syntax:

句法：

public static Instant from(TemporalAccessor temp_acc);

Parameter(s):

參數(shù)：

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

  TemporalAccessor temp_acc –表示要轉(zhuǎn)換為Instant的臨時(shí)訪問(wèn)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(lèi)型為Instant ，它返回Instant，該Instant具有給定對(duì)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(jù)類(lèi)名示例化類(lèi)

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