Java java.time.Instant用法及代碼示例

import java.time.*; 
import java.time.temporal.*; 
public class GFG { 
    public static void main(String[] args) 
    { 
        // Parsing a string sequence to Instant 
        Instant inst1 = Instant.parse("2021-02-09T11:19:42.12Z"); 
        System.out.println("Parsed instant is " + inst1); 
        
        // Using isSupported() method to check whether the 
        // specified field is supported or not 
        System.out.println(inst1.isSupported(ChronoUnit.DAYS)); 
        System.out.println(inst1.isSupported(ChronoUnit.YEARS)); 
        
        // Using Instant.now() to get current instant 
        Instant cur = Instant.now(); 
        System.out.println("Current Instant is " + cur); 
        
        // Using minus() method to find instant value after 
        // subtraction 
        Instant diff = inst1.minus(Duration.ofDays(70)); 
        System.out.println("Instant after subtraction : "+ diff); 
        
        // Using plus() method to find instant value after 
        // addition 
        Instant sum = inst1.plus(Duration.ofDays(10)); 
        System.out.println("Instant after addition : "+ sum); 
    } 
}