Generate different random numbers for each consecutive iteration in java.

As in C we have srand(time(NULL))) to ensure that the random number which will be generated on next call will be different than the random number generated for current call.

What i tried is this.

Random r=new Random();
for(int i=0;i<100;i++)
{
System.out.println(r.nextInt(1000)); 
}

But it may print similat number in consecutive iterations.

I want that it should print different numbers in consecutive iterations.

Are there any predefined methods to achieve this ?