Java 中的 Date toInstant()方法，带示例
原文:https://www . geesforgeks . org/date-to instant-method-in-Java-with-examples/
Java 中日期类的 toInstant() 方法用于将日期对象转换为即时对象。转换过程中会创建一个“瞬间”，用于表示时间线上与此日期相同的点。
语法:
public Instant toInstant()
参数:该方法不取任何参数。
返回值:该方法返回一个瞬间，代表时间线上与该日期相同的点。
下面的程序说明了如何在 Java 中使用 toInstant()方法: 示例 1:
// Java code to demonstrate
// toInstant() method of Date class
import java.util.Date;
import java.util.Calendar;
import java.time.Instant;
public class GfG {
public static void main(String args[])
{
// Creating a Calendar object
Calendar c1 = Calendar.getInstance();
// Set Month
// MONTH starts with 0 i.e. ( 0 - Jan)
c1.set(Calendar.MONTH, 00);
// Set Date
c1.set(Calendar.DATE, 30);
// Set Year
c1.set(Calendar.YEAR, 2019);
// Creating a date object
// with specified time.
Date dateOne = c1.getTime();
Instant inst = dateOne.toInstant();
System.out.println(
"Original Date: "
+ dateOne.toString());
System.out.println(
"Instant: " + inst);
}
}
Output:
Original Date: Wed Jan 30 06:01:46 UTC 2019
Instant: 2019-01-30T06:01:46.730Z
例 2:
// Java code to demonstrate
// clone() method of Date class
import java.util.Date;
import java.util.Calendar;
import java.time.Instant;
public class GfG {
public static void main(String args[])
{
// Creating a Calendar object
Calendar c1 = Calendar.getInstance();
// Set Month
// MONTH starts with 0 i.e. ( 0 - Jan)
c1.set(Calendar.MONTH, 06);
// Set Date
c1.set(Calendar.DATE, 12);
// Set Year
c1.set(Calendar.YEAR, 1996);
// Creating a date object
// with specified time.
Date dateOne = c1.getTime();
Instant inst = dateOne.toInstant();
System.out.println(
"Original Date: "
+ dateOne.toString());
System.out.println(
"Instant: " + inst);
}
}
Output:
Original Date: Fri Jul 12 06:01:49 UTC 1996
Instant: 1996-07-12T06:01:49.766Z
参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/date . html # to instant–
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