Java 中的即时截断 To()方法，示例
原文:https://www . geeksforgeeks . org/instant-shopped to-method-in-Java-with-examples/
一个瞬间类的截断到()方法用来获取这个瞬间在指定单位的值。此方法采用一个参数“单位”，即本瞬间被截断到的单位。它返回一个截断的不可变瞬间，其值以指定的单位表示。
语法:
public Instant truncatedTo(TemporalUnit unit)
参数:该方法取一个参数单位，该单位是本瞬间被截断到的单位。它不应为空。
返回:该方法返回一个不可变的截断瞬间，其值以指定的单位表示。
异常:此方法抛出以下异常:
- Abnormal date and time: If the unit is invalid for truncation.
- Unsupported company is not supported.
下面的程序说明了即时截断()方法:
程序 1:
// Java program to demonstrate
// Instant.truncatedTo() method
import java.time.*;
import java.time.temporal.ChronoUnit;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant
= Instant.parse("2018-12-30T09:24:54.63Z");
// print instance
System.out.println("Instant before"
+ " truncate: "
+ instant);
// truncate to ChronoUnit.HOURS
// means unit smaller than Hour
// will be Zero
Instant returnvalue
= instant.truncatedTo(ChronoUnit.HOURS);
// print result
System.out.println("Instant after "
+ " truncate: "
+ returnvalue);
}
}
输出:
Instant before truncate: 2018-12-30T09:24:54.630Z
Instant after truncate: 2018-12-30T09:00:00Z
程序二:
// Java program to demonstrate
// Instant.truncatedTo() method
import java.time.*;
import java.time.temporal.ChronoUnit;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant
= Instant.parse("2018-12-30T09:24:54.63Z");
// print instance
System.out.println("Instant before"
+ " truncate: "
+ instant);
// truncate to ChronoUnit.DAYS
// means unit smaller than DAY
// will be Zero
Instant returnvalue
= instant.truncatedTo(ChronoUnit.DAYS);
// print result
System.out.println("Instant after "
+ " truncate: "
+ returnvalue);
}
}
输出:
Instant before truncate: 2018-12-30T09:24:54.630Z
Instant after truncate: 2018-12-30T00:00:00Z
程序 3: 显示异常:
// Java program to demonstrate
// Instant.truncatedTo() method
import java.time.*;
import java.time.temporal.ChronoUnit;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant
= Instant.parse("2018-12-30T09:24:54.63Z");
try {
instant.truncatedTo(ChronoUnit.ERAS);
}
catch (Exception e) {
// print result
System.out.println("Exception: " + e);
}
}
}
输出:
Exception:
java.time.temporal.UnsupportedTemporalTypeException:
Unit is too large to be used for truncation
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