Get specific ArrayList item
public static ArrayList mainList = someList; How can I get a specific item from this ArrayList? mainList[3]? 8 Answers 8
arraylist
How to split() a delimited string to a List
I had this code: String[] lineElements; . . . try { using (StreamReader sr = new StreamReader(“TestFile.txt”)) { String line; while ((line = … Read more
Check if a value exists in ArrayList
How can I check if a value that is written in scanner exists in an ArrayList? List<CurrentAccount> lista = new ArrayList<CurrentAccount>(); CurrentAccount conta1 … Read more
How to efficiently remove all null elements from a ArrayList or String Array?
I try with a loop like that // ArrayList tourists for (Tourist t : tourists) { if (t != null) { t.setId(idForm); } … Read more
How can I create an Array of ArrayLists?
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 … Read more
make arrayList.toArray() return more specific types
So, normally ArrayList.toArray() would return a type of Object[]….but supposed it’s an Arraylist of object Custom, how do I make toArray() to return … Read more
How to count the number of occurrences of an element in a List
I have an ArrayList, a Collection class of Java, as follows: ArrayList<String> animals = new ArrayList<String>(); animals.add(“bat”); animals.add(“owl”); animals.add(“bat”); animals.add(“bat”); As you can … Read more
When to use a linked list over an array/array list?
I use a lot of lists and arrays but I have yet to come across a scenario in which the array list couldn’t … Read more
How to sort an ArrayList in Java [duplicate]
This question already has answers here: Sort ArrayList of custom Objects by property (29 answers) Closed 8 years ago. I have a class … Read more
How to declare an ArrayList with values? [duplicate]
This question already has answers here: Initialization of an ArrayList in one line (33 answers) Closed 6 years ago. ArrayList or List declaration … Read more