Question

How to Create an Array List in java?

Answer 1

Syntax: Array List<E> al = new Array List<E>();

Array List<E> al = new Array List <E>(int initialcapacity);

Here, E represents element data type

Methods of Array List:

1. Boolean add(Element obj): this method is used to place the specified element to the end of List.
2. Void add(int position, Element obj): this method is used to insert and element at the specified position.
3. Boolean remove(Element obj): this method is used to remove the 1^st occurrence of the specified element.
4. Element remove(int position): this method is used to remove and Element from the specified position.
5. Void clear(): this method remove all the elements available in the Array List.
6. Int Size(): this method will return the count of the no.of elements available in the Array List.
7. Boolean contains(element obj): this method returns true if the specified element is available in the Array List.
8. Element get(int position): this method is used to access an Element that is available in the specified position.
9. Element set(int position, Element obj): this method is used replace an element in the specified position with the specified element.