Java 中的 Instant isAfter()方法，示例

原文:https://www . geesforgeks . org/instant-is after-method-in-Java-with-examples/

isAfter() 一个瞬间类的方法用来检查这个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内容的布尔值。

语法:

public boolean isAfter(Instant otherInstant)

参数:该方法取一个参数 otherInstant ，即与该瞬间比较的另一个瞬间。它不应为空。

返回:如果这个瞬间在指定的瞬间之后，这个方法返回真。否则返回假。

异常:如果作为参数传递的 otherInstant 为空，则该方法抛出空指针异常。

下面的程序说明了 isAfter()方法:

程序 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

程序二:

// 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

程序 3: 显示 isAfter 抛出的异常()

// 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 # isaafter(Java . time . instant)

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