There are two ways to achieve what you desire. I am providing code snippet for both: 1. List<List<String>> lol = new ArrayList<List<String>>(); //Declare your two dimensional …

to get the ArrayList at the position 2 and then set the second element to 9. This gets the third (i.e. index = 2) element of the outer ArrayList, which returns the inner ArrayList. Then set the 2nd …

Jun 6, 2013 · If you want to create a 2D array of ArrayList.Then you can do this : ArrayList[][] table = new ArrayList[10][10]; table[0][0] = new ArrayList(); // add another ArrayList object to [0,0] …

Dec 12, 2024 · The set() method of the ArrayList class in Java is used to replace an element at a specified position with a new value. This is very useful when we need to update an existing …

Jan 8, 2024 · Let’s first initialize the variables and the 3-D ArrayList: int x_axis_length = 2; int y_axis_length = 2; int z_axis_length = 2; ArrayList<ArrayList<ArrayList<String>>> space = …

This tutorial shows you how to create a 2-d List of String or Character type in Java. In Java, you can create a 2D list (also known as a 2D array or matrix) of String or Character types using …

Sep 13, 2022 · In Java, the toArray() method is the part of the AbstractCollection class. It is used to convert collections like List, Set, etc. into an array. It copies all the elements from the …

Declaring a 2D ArrayList of Strings in Java involves using nested ArrayLists, where each element can be another ArrayList containing Strings. This allows for the creation of dynamic two …

Learn how to effectively create and manage a two-dimensional ArrayList in Java with step-by-step guidance and examples.

Nov 10, 2013 · You should get the second List first and then set the element in this list. So it should be : group.get(1).set(1, value); ^ ^ | | | set the second value of this list to value | get the …