clementer

I am looking to sort an arraylist of arraylist of doubles and I require help? I was informed that I need to implement comparator or comparable and then use the collection.sort to sort the list of list in order... ArrayList<ArrayList> list = new ArrayList<ArrayList>() If you look at the list …

ArrayList<ArrayList<Double> how to sum an arraylist of and arraylist the += does not work marks an error.

I want to check if the last numbers in an arraylist are a 10.My data is in a 2d arraylist with 110 elements every 10 numbers is one node, I want to verify that the last digit of each node is a 10. example: 1,2,3,4,5,6,7,8,9,10 in this case its true …

Check 4th element of an arraylist and compare it to an element. example: 1,1,2,4,1,2,3,4,1,2,5,1. so the 4th elements would be 4,4,1 and i want to compare that those numbers are the same as 4. I was thinking an if statemet would work. any recomendations?

How do I compare 3 Arraylist with each other and find the small, medium and large elements. I was thinking something like this but its not working. ArrayList<interger> a = new ArrayList<ArrayList<interger> >(); a.add(1); a.add(2); a.add(7); ArrayList<interger> b =new ArrayList<ArrayList<interger> >(); b.add(8); b.add(9); b.add(1); ArrayList<interger> c = new ArrayList<ArrayList<interger> >(); …

I would like to calculate the distance in 4d I have 2 arraylist that have all of my elements in it. How do make the formula i have this but its not calculating correctly the distance. List has diferent coordinates every time and t always has the same coordinates. double …

I have an ArrayList of 750 elements I would like to divide that ArrayList into 150 subarraylists so 5 elements to each subarraylist. I have this code but it not working while (scanner.hasNextLine()) { String t = scanner.nextLine(); String[] ar = t.split(","); for (int i = 0; i < ar.length; …

I have an array list that looks like this. 8.1,6.5,4.4,3.2,1,8.9,5,1.4,0.1,1,8.7,6.2,4.3,3.2,3 I would like that my program selects every 5 numbers randomly. for example to select 8.1,6.5,4.4,3.2,1,8.7,6.2,4.3,3.2,3 as you can see it selected 5 numbers from the begging and 5 more from the end and saves them Random random_method = new …