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java

How to compare two instants in Java?

I want comparison two Instants to see if equals both or greater than, but i can’t. i dont know. how i can compare instants?

  private Instant expiration;

 if(expiration()==Instant.now()||expiration()>Instant.now())
  {
     valid+="the Expire date is invalid check it . ";
  }

i try this way but i have compile error. but i think cant comparison in this way it must change instant to String and compare after it but i dont know how to format to string

Solution

  • Don't convert them to Strings. Instant, like every other Comparable type, has the compareTo method. Use it like this:

    if (expiration.compareTo(Instant.now()) >= 0) {
  ...
}