Jun 17, 2009 · Usually you should just declare variables by the most general interface that you are going to use (e.g. Iterable, Collection, or List), and initialize them with the specific …

ArrayList or List declaration in Java has questioned and answered how to declare an empty ArrayList but how do I declare an ArrayList with values? I've tried the following but it returns a …

Jan 17, 2012 · I faced with the similar issue, and just knowing the arrayList is a resizable-array implementation of the List interface, I also expect you can add element to any point, but at …

Jun 6, 2013 · Oh and you declare 2D ArrayList of String in the first part of your question. Is that correct that you need to put String in your inner ArrayList?

Sep 7, 2012 · ArrayList<String> list = new ArrayList<>(); By declaring and using generic types you are informing a structure of the kind of objects it will manage and the compiler will be able to …

I am wanting to create an array of arraylist like below: ArrayList<Individual> [] group = new ArrayList<Individual> () [4]; But it's not compiling. How can I do this?

May 7, 2012 · System.out.println("Arraylist contains: " + arl.toString()); If you want to access the i element, where i is an index from 0 to the length of the array-1, you can do a :

11 A 2d array is simply an array of arrays. The analog for lists is simply a List of List s. ArrayList<ArrayList<String>> myList = new ArrayList<ArrayList<String>>(); I'll admit, it's not a …

4 I'm working on a class project to build a little Connect4 game in Java. My current thinking is to have a class of Columns that have as instance variable a few integers (index, max. length, …

Jul 17, 2019 · I have a project on entering an integer value into a global array. I'm using ArrayList and can't seem to figure out how to add values into the array I'm not quite sure how to add the …