Java Instant isAfter()用法及代碼示例

Instant類的isAfter()方法用於檢查此瞬間是否在作為參數傳遞的瞬間之後。此方法返回一個顯示相同值的布爾值。

用法:

public boolean isAfter(Instant otherInstant)

參數：此方法采用參數otherInstant，該參數是要與該瞬間進行比較的另一瞬間。它不能為空。

返回值：如果此時刻在指定時刻之後，則此方法返回true。否則返回false。

異常：如果以參數為null傳遞的otherInstant，則此方法將引發NullPointerException。

以下示例程序旨在說明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); 
    } 
}

輸出：

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); 
    } 
}

輸出：

Instance 1: 2018-10-30T19:34:50.630Z
Instance 2: 2018-11-27T04:52:08.970Z
Is Instant1 after Instant2: false

示例3:顯示isAfter()引發的異常

// 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); 
        } 
    } 
}

輸出：

Instance 1: 2018-10-30T19:34:50.630Z
Instance 2: null
Exception: java.lang.NullPointerException

參考文獻： https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html#isAfter(java.time.Instant)

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