I want to create a 2D array that each cell is an ArrayList! 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] table[0][0].add(); // add object to that ArrayList
Error: cannot find symbol ArrayList
ArrayList is unique in its naming standards. Here are the equivalencies: Array.push -> ArrayList.add(Object o); // Append the list Array.pop -> ArrayList.remove(int index); // Remove list[index] Array.shift -> ArrayList.remove(0); // Remove first element Array.unshift -> ArrayList.add(int index, Object o); // Prepend the list Note that unshift does not remove an element, but instead adds one to the list. Also note that corner-case … Read more
How to get the last value of an ArrayList
You need to use the new operator when creating the object Contacts.add(new Data(name, address, contact)); // Creating a new object and adding it to list – single step or else Data objt = new Data(name, address, contact); // Creating a new object Contacts.add(objt); // Adding it to the list and your constructor shouldn’t contain void. … Read more
Add String Array to ArrayList
Incompatible types List of List and ArrayList of ArrayList
You are attempting to access a private member of ArrayList, part of its internal working that are not supposed to be used externally If you want to get the size of the arraylist you want the method: Why is it like this This gives the ArrayList class the option to store size in whatever way it wants. Does … Read more
4 I want a test class to test this class but i dont know how to write it and i tried to see online but i still couldnt figure it out.I wrote the code on BlueJ, i’m trying to create the set game. import java.util.*; public class Deck { ArrayList<Card> deck; public Deck () { … Read more
Try something like List<String> myList = new ArrayList<String>(Arrays.asList(s.split(“,”))); Demo: String s = “lorem,ipsum,dolor,sit,amet”; List<String> myList = new ArrayList<String>(Arrays.asList(s.split(“,”))); System.out.println(myList); // prints [lorem, ipsum, dolor, sit, amet] This post has been rewritten as an article here.
