Java ArrayList how to add elements at the beginning

Question

I need to add elements to an ArrayList queue whatever, but when I call the function to add an element, I want it to add the element at the beginning of the arra

Answer 1

You can use

public List addToListStart(List list, E obj){
list.add(0,obj);
return (List)list;

}

Change E with your datatype

If deleting the oldest element is necessary then you can add:

list.remove(list.size()-1); 

before return statement. Otherwise list will add your object at beginning and also retain oldest element.

This will delete last element in list.