android ArrayList iterator

Question

I am trying to use an iterator on an ArrayList ( to get rid of a for loop, don't ask me why... ), however I need to skip the process of one of the arrays upon a boolean condition , should I still use an index and a break ???

// INTERPOLATION
int i = 0;
Iterator<CircularFifoQueue<SensorEvent>> buf = samplingFifoQueues.iterator();
while (buf.hasNext()) {
    if ( i == 2 && !mDeviceSensorGyro) {  // skip this queue if no gyroscope in device
       break;
    }               
    // proceed
   buf.next();
   i++;
}

thanks for help

Do you want to continue over to the next element's processing or just want to break completely out of it? — StoopidDonut
– StoopidDonut, Commented Feb 7, 2014 at 10:39
@Gangnus well it does yes but the statement wasn't perfectly clear to me hence the comment, doesn't that align to the correct usage of the comments section after all? — StoopidDonut
– StoopidDonut, Commented Feb 7, 2014 at 11:25
@PopoFibo In comments it is skip, too. in CODE there is a break, yes. The task is set by words, code IS incorrect, according to the questionner. — Gangnus
– Gangnus, Commented Feb 7, 2014 at 11:27

Gangnus · Accepted Answer · 2014-02-07 11:10:14Z

1

What about this:

// INTERPOLATION
int i = 0;
Iterator<CircularFifoQueue<SensorEvent>> buf = samplingFifoQueues.iterator();
while (buf.hasNext()) {
    if ( i != 2 || mDeviceSensorGyro) {  // skip this queue if no gyroscope in device
       // proceed  
    }               

    buf.next();
    i++;
}

But I would rather attach some attribute to the queue elements to check for it. Work directly with numbers is bad practice.

edited Feb 7, 2014 at 11:10

answered Feb 7, 2014 at 11:01

Gangnus

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2 Comments

user762579 Over a year ago

this will work fine... however I inserted a test buf.isEmpty() to skip it, if it doesn't exist there are no data captured...

Gangnus Over a year ago

@erwin Of course. It is a normal practice to have many conditions under which the different branches are taken inside and out of the cycle.

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