CODEWITHSUNDEEP
javaandroid
Adarsh
Adarsh

Reputation: 105

How to remove last element of arraylist

I am trying to remove the last element of arraylist after every 10 minutes. I am using this code to do that:

final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask doAsynchronousTask = new TimerTask() {       
    @Override
    public void run() {
        handler.post(new Runnable() {
            public void run() {       
               array.remove(array.size() -1);   //array is my ArrayList object

            }
        });
    }
};

timer.schedule(doAsynchronousTask, 0, 600000); //execute in every 10 minutes

But it is giving IndexOutOfBoundsException.Can anyone solve this problem.

Upvotes: 0

Views: 6032

Answers (3)

Xenolion
Xenolion

Reputation: 12715

     //check if its null or not when debugging
      if(array!=null){
        //Log something thats it is not null at this point
         if(array.size()>0){
               array.remove(array.size() -1);
           }
         else{ 
             //Log the array is empty 
           }
       }

Upvotes: 0

fitu
fitu

Reputation: 115

You have an empty array as @TheAndroidDev said. What about to use Rx, something like this:

Observable.from(array)
            .interval(10, TimeUnit.MINUTES)
            .map(i -> array.size() > 0 ? array.remove(array.size() - 1) : null)
            .take(array.size())
            .subscribe(integer -> {
                // Do something with the integer or type you use
            });

Upvotes: 0

MichaelStoddart
MichaelStoddart

Reputation: 5639

You are getting IndexOutOfBounds because you are trying to remove an item that isn't there, so you should perform a check on your removal to stop the removal if there is nothing there:

if(array.size() > 0){
    array.remove(array.size() -1);
}

Upvotes: 4

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