Find and update an element in a Java Queue - data-structures

Question

Trying to work on small use case where i have to add string of websites in a queue. if the site repeats then i have to update the numberofVisits+1. Else i would add that object into the queue. Something wrong with updateCount code. Please let me know
here is the code snippet. I am unable to move forward on this.
public CLassName(String url, int numVisits) {
this.url = url;
this.numVisits = numVisits;
}
public int getNumVisits() {
return this.numVisits;
}
public String getUrl() {
return this.url;
}
public void setNumVisits(int updatedNumVisits) {
this.numVisits = updatedNumVisits;
}
private static Queue<ClassName> sites = new LinkedList<ClassName>();
// Method to find the website in the queue and increment the visited count by 1, adding new node in case website is not found
public static void update(String url) {
//code should go in here. // THis is wrong code
if (sites.isEmpty()) sites.add(new ClassName(url,1));
while(!sites.isEmpty()) {
String tmpUrl = sites.peek().getUrl();
int numVisits = sites.peek().getNumVisits();
if(tmpUrl!=null && tmpUrl.equalsIgnoreCase(url)) {
sites.add(new ClassName(tmpUrl,numVisits+1));
} else if(tmpUrl!=null){
sites.add(new ClassName(tmpUrl,numVisits));
} else {
sites.add(new ClassName(url,1));
}
}
}
public static void main(String[] args) {
String[] visitedSites = { "www.google.co.in", "www.google.co.in", "www.facebook.com", "www.upgrad.com", "www.google.co.in", "www.youtube.com",
"www.facebook.com", "www.facebook.com", "www.google.co.in", "www.microsoft.com", "www.9gag.com", "www.netflix.com",
"www.netflix.com", "www.9gag.com", "www.microsoft.com", "www.amazon.com", "www.amazon.com", "www.uber.com", "www.amazon.com",
"www.microsoft.com" };
for (String url : visitedSites) {
update(url);
}

Answer 1

Thanks for the recommendation. I did a small tweek to address the problem.
I did not add Dummy site
Added a counter and incremented so that it is always < the size of queue
Here is my solution and it works
public static void update(Queue<String> sites,String url,int numberOfVisits)
{
if ( sites.isEmpty()) sites.add(url); // first time
boolean flag = false;
int counter = 0
while (!sites.empty && counter<sites.size()) //go over all the urls in the queue
{
if (sites.head().equalsIgnoreCase(url))
{
flag = true;
break;
}
sites.insert(sites.remove()); //removing the head and inserting it to the end of the queue
counter ++;
}
if (!flag==true) {
numberOfVisits=numberOfVisits+1;
}
else {
sites.insert(url);
}
}

Answer 2

the update method just could be like this;
boolean increased = false;
Iterator<ClassName> statIterator = sites.iterator();
while (statIterator.hasNext()) {
ClassName st = statIterator.next();
if (st.getUrl().equals(url)) {
st.setNumVisits(st.getNumVisits()+1);
increased = true;
break;
}
}
if (!increased) {
sites.add(new ClassName(url,1));
}