How to add an object to an ArrayList in Java
Contacts.add(objt.Data(name, address, contact));
This is not a perfect way to call a constructor. The constructor is called at the time of object creation automatically. If there is no constructor java class creates its own constructor.
The correct way is:
// object creation.
Data object1 = new Data(name, address, contact);
// adding Data object to ArrayList object Contacts.
Contacts.add(object1);
Try this one:
Data objt = new Data(name, address, contact);
Contacts.add(objt);
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
. Else it becomes a method in your class.
public Data(String n, String a, String c) { // Constructor has the same name as the class and no return type as such