Thread: ArrayList<> String searches and loops

To get the rating of an app I need to call the getRating() method. I'm pretty sure I want to use a for-each loop because I need to check each app for a rating.

There isn't a special method that says if an app is rated that I know of. There are a couple of methods that print out the details of each app, but I don't think that's what we're looking for.

In order to find out what apps have been rated I think I should compare the parameter with app.getRating().

Yes, this was my thinking. When I was working through this today I couldn't get the rating from get.appRating() to match the given rating parameter of getNumAppsWithRating method. I will work with your tips.

--- Update ---

I'm a little confused here. I need to find the apps that are rated and compare them to the parameter. How do I store an integer in an ArrayList? I keep getting an error message that says incompatible types: java util.ArrayList cannot be converted to int. I don't know what ArrayList<Integer> is for, I've never seen it, but is that what I'm supposed to be using?

Man, I guess I took your comment "It seems like the logic for this method is the same as for the getAppsByAuthor method." to literal. You didn't actually say that the method would be written the same, you said the logic. Maybe I was hoping, I apologize.

Here is what needs to be done:

To get the rating of an app I need to call the getRating() method. I'm pretty sure I want to use a for-each loop because I need to check each app for a rating.

There isn't a special method that says if an app is rated that I know of. There are a couple of methods that print out the details of each app, but I don't think that's what we're looking for.

In order to find out what apps have been rated I think I should compare the parameter with app.getRating().

At least I know the for-each loop will wrap around the code that ultimately produces my answer. I think I got that much. Off to the drawing board.

Somehow I managed to figure this out...took all night, but it works. Now my problem is if the rating searched is 0. I want it to just error message, not iterate anything. There are no 0 ratings because they are invalid, but there are "not rated." Here's what I came up with.

/**
 *@locate apps that have been rated 
 *@param represents a rating
 *return the number of apps in store that 
 *have given rating
 *Example: If two apps have a rating of 3, then
 *the call to getNumAppsWithRating(3) returns 2
 */
 
public int getNumAppsWithRating(int rating)
{ 
   int numAppsWithRating;
   numAppsWithRating = 0;
   for(App app : appList) {
       if(app.getRating() == (rating)) {
           numAppsWithRating++;
       }
   }
   return numAppsWithRating;    
}

It does for the most part. The only issue that I have with it is, if the user searches for apps rated 0, it will return the unrated apps. But, if you search for apps with rating above 4, it returns 0. I want to make it so that if the user searches for apps with a rating of 0, an error message pops up and no apps are returned. I've tried this code in numerous spots within this method and it still returns the unrated apps. Suggestions?

 
for(App app : appList) {
    if(rating == 0) {
        System.out.println("");
    }
}