java for loop executes too fast gives System.currentTimeMillis() duplicate

Question

Java: I have a problem using System.currentTimeMillis() function

i am using System.currentTimeMillis() to generate unique values in foor loop problem is loop executes too fast and System.currentTimeMillis() gives me duplicate values.

How can i generate for sure unique values.

for(int a=0;a<=10;a++){
System.out.println(System.currentTimeMillis())
}

I also tried following but it is also not generaet to generate unique number

System.currentTimeMillis()+Math.random()

Answer 1

why don't you use System.nanoTime() instead?

Answer 2

Why don't you use a UUID library to generate unique identifiers (already there in the JDK http://download.oracle.com/javase/6/docs/api/java/util/UUID.html).

Or for a more simple approach: append a static counter