Note, you don’t need the size of the arraylist to iterate over it. You can simply do for (Entity e : myList){ //Do stuff with e } If you do need the index and hence need to call .size(), please post some sample code so someone can see what’s going wrong. 7 solved ArrayList.size() returns … Read more
You are having a method named getSpellEffect() inside the main() method. You cannot have methods inside methods. Check Methods inside methods import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class SpellsList { static List<Spell> spellsList = new ArrayList<Spell>(); static { spellsList.add(new Spell(“Fireball”, “damage”, 5)); spellsList.add(new Spell(“Ice Storm”, “damage”, 8)); spellsList.add(new Spell(“Heal”, “heal”, 8)); } static String … Read more
You create a new reception’s object on every cycle iteration. Try to put this definition before the cycle and use this object in the cycle. Also, you’ll need to write an empty constructor and getters/setters for values: reception add=new Reception(); do { … add.setNumerodehotel(x); add.setResidente1(name); } while (…) public abstract class Hotel { ArrayList<Integer> numerodehotel … Read more
Please override the toString() method in your Search class. public String toString(){ return url + “, ” + txt; } 2 solved java ArrayList returns wrong result [closed]
Why is my ArrayList throwing a “PSCustomObject doesn’t contain a method for ‘foreach’” error when the ArrayList contains <= 1 item, & only in PS 5? solved Why is my ArrayList throwing a “PSCustomObject doesn’t contain a method for ‘foreach’” error when the ArrayList contains
This is a example program to get what you asked for… hope it helps public static void main(String[] args) { ArrayList<String []> a = new ArrayList<>(); String b[] = {“not here”,”not here2″}; String c[] = {“not here3″,”i’m here”}; a.add(b); a.add(c); for (String[] array : a) {// This loop is used to iterate through the arraylist … Read more
Simply pass the object of the created ArrayList to the function as paramter. Here’s a short example for printing the ArrayList: Assuming you put the code inside a class, leaving a snippet here. I’ll demonstrate it with Integer examples. static void printArrayList(ArrayList<Integer> a){ for(Integer i:a) System.out.print(i+” “); System.out.println(“”); } //in the main function: public static … Read more
Yes. For example, if you were trying to ‘catch’ an InvalidYearException, you would do something like this: try { // Your code (the code that will possibly cause an exception to be thrown) } catch(InvalidYearException exception) { // Your code (the code that will be executed when you ‘catch’ an InvalidYearException) // for example: System.out.println(“Error!” … Read more
I don’t think you’re really asking about what Collections.shuffle does in general: I think you’re asking why Collections.shuffle affects the output: You are creating a load of tasks of two kinds: one of them increments a value (“kind 1”); the other increments a value and sometimes prints a message (“kind 2”). These are put into … Read more
Introduction The Collections.shuffle function is a powerful tool in Java that allows you to randomly rearrange the elements of a collection. This can be useful for a variety of tasks, such as shuffling a deck of cards, randomly selecting elements from a list, or randomly generating numbers. The Collections.shuffle function is easy to use and … Read more
The difference between the two elements in a column is 9: a[i][j] = a[i-1][j] + 9, thus the code may be modified as: public static void main(String args[]) { int array[][] = new int[6][5]; // initialize the first row array[0] = new int[] {1, 2, 3, 5, 7}; // print the first row System.out.println(Arrays.toString(array[0])); for … Read more
There’s a pretty simple way to check if an item already exists in the list: Override the equals method. You will have to override the equals method inside your ExampleItem class. I don’t know the contents, ie. code, of your ExampleItem but this is just my guess so I suggest you to change your code … Read more
List<List<Citizen>> mainList= new ArrayList<>(); You can go with List of List. Also need to consider below points. I recommend using “List” instead of “ArrayList” on the left side when creating list objects. It’s better to pass around the interface “List” because then if later you need to change to using something like Vector (e.g. you … Read more
As you are counting each character no matter if it is on the left or right side, you can use just one result structure. Datatype Set is nice if you just want to know the different kind of characters that occures but you also want the count so I suggest to change your result data … Read more
Your code appears Fine. A simple logic modification that you can do is instead of using count++ for every repeated values,just put the integers from Array A to your ArrayList<> and when putting the next integer from Array A just parse through the ArrayList<> to check whether we have the number already present. Then same … Read more