Unique File name using system time in Java?

Question

I want to use unique id for the files. How can I use system time to generate unique IDs in Java?

Answer 1

You're looking for the UUID class.

Answer 2

UUID class is what you need.

Sample implementation :

public class RandomStringUUID {

    public static void main(String[] args) {
                UUID uuid = UUID.randomUUID();
                String randomUUIDString = uuid.toString();

                System.out.println("Random UUID String = " + randomUUIDString);
                System.out.println("UUID version       = " + uuid.version());
                System.out.println("UUID variant       = " + uuid.variant());
           }
      }

Output :

Random UUID String = 7dc53df5-703e-49b3-8670-b1c468f47f1f
UUID version       = 4
UUID variant       = 2