Instant类的isAfter()方法用于检查此瞬间是否在作为参数传递的瞬间之后。此方法返回一个显示相同值的布尔值。
用法:
public boolean isAfter(Instant otherInstant)
参数:此方法采用参数otherInstant,该参数是要与该瞬间进行比较的另一瞬间。它不能为空。
返回值:如果此时刻在指定时刻之后,则此方法返回true。否则返回false。
异常:如果以参数为null传递的otherInstant,则此方法将引发NullPointerException。
以下示例程序旨在说明isAfter()方法:
示例1:
// Java program to demonstrate
// Instant.isAfter() method
import java.time.*;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant1
= Instant.parse("2018-12-30T19:34:50.63Z");
// create other Instant
Instant instant2
= Instant.parse("2018-12-29T09:24:00.63Z");
// print instances
System.out.println("Instance 1: " + instant1);
System.out.println("Instance 2: " + instant2);
// check if instant1 is after instant2
// using isAfter()
boolean value = instant1.isAfter(instant2);
// print result
System.out.println("Is Instant1 after Instant2: "
+ value);
}
}
输出:
Instance 1: 2018-12-30T19:34:50.630Z Instance 2: 2018-12-29T09:24:00.630Z Is Instant1 after Instant2: true
示例2:
// Java program to demonstrate
// Instant.isAfter() method
import java.time.*;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant1
= Instant.parse("2018-10-30T19:34:50.63Z");
// create other Instant
Instant instant2 = Instant.now();
// print instances
System.out.println("Instance 1: " + instant1);
System.out.println("Instance 2: " + instant2);
// check if instant1 is after instant2
// using isAfter()
boolean value = instant1.isAfter(instant2);
// print result
System.out.println("Is Instant1 after Instant2: "
+ value);
}
}
输出:
Instance 1: 2018-10-30T19:34:50.630Z Instance 2: 2018-11-27T04:52:08.970Z Is Instant1 after Instant2: false
示例3:显示isAfter()引发的异常
// Java program to demonstrate
// Instant.isAfter() method
import java.time.*;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant1
= Instant.parse("2018-10-30T19:34:50.63Z");
// create other Instant
Instant instant2 = null;
try {
// print instances
System.out.println("Instance 1: " + instant1);
System.out.println("Instance 2: " + instant2);
// check if instant1 is after instant2
// using isAfter()
boolean value = instant1.isAfter(instant2);
}
catch (Exception e) {
// print result
System.out.println("Exception: " + e);
}
}
}
输出:
Instance 1: 2018-10-30T19:34:50.630Z Instance 2: null Exception: java.lang.NullPointerException
参考文献: https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html#isAfter(java.time.Instant)
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