Design Hit Counter

/**
Design Hit Counter
Design a hit counter which counts the number of hits received in the past 5 minutes.
Each function accepts a timestamp parameter (in seconds granularity) and you may assume that calls are being made to the system in chronological order (ie, the timestamp is monotonically increasing). You may assume that the earliest timestamp starts at 1.
It is possible that several hits arrive roughly at the same time.
Example: HitCounter counter = new HitCounter();
// hit at timestamp 1. counter.hit(1);
// hit at timestamp 2. counter.hit(2);
// hit at timestamp 3. counter.hit(3);
// get hits at timestamp 4, should return 3. counter.getHits(4);
// hit at timestamp 300. counter.hit(300);
// get hits at timestamp 300, should return 4. counter.getHits(300);
// get hits at timestamp 301, should return 3. counter.getHits(301);

Follow up: What if the number of hits per second could be very large? Does your design scale?
*/

public class DesignHitCounter{

int[] hits;
int[] times;

public DesignHitCounter{
hits = new int[300];//store the number of hits for last 5 minutes or 300 seconds
times= new int[300];
}

public void hit(int timestamp){
int index = timestamp%300;
//acti like a circular array, where the new timestamps get pushed into the head once the circular array gets filled
if(times[index]!=timestamp){
hits[index] = 1;
times[index] = timestamp;
}else{
hits[index]++;
}
}

public int getHits(int timestamp){
int total = 0;
//iterate through the last 300 seconds and collect the number of hits
for(int i=0;i<300; i++){
if(timestamp - times[i] <300){
total+=hits[i];
}
}
return total;

}
}