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Returns the index of the last occurrence of the specified element in this list, or – 1 if this list does not contain the element. Returns the index of the first occurrence of the specified element in this list, or – 1 if this list does not contain the element. Returns the element at the specified position in this list. Returns true if this list contains all of the elements of the specified collection. Returns true if this list contains the specified element. Returns a shallow copy of this ArrayList instance. Retains only the elements in this list that are contained the specified collection. Removes from this list all of its elements that are contained in the specified collection. Removes the first occurrence of the specified element from this list, if it is present. Trim the capacity of the instance of the ArrayList to the list’s current size. Inserts all of the elements in the specified collection into this list at the specified position. Inserts the specified element at the specified position in this list.īoolean addAll( int index, Collection c) declaring ArrayList with initial size numĪppends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection’s iterator. Java ArrayList class implements RandomAccess interface.ArrayList is index based we can randomly access elements using index positions.ArrayList can hold String and wrapper class objects (Double, Integer).ArrayList cannot hold primitive data types such as int, double, char, and long.Because ArrayList elements are stored in consecutive memory locations. For frequent retrieving operation java ArrayList is the best.ArrayList is a re-sizable array that grows dynamically when elements are added and decreased when elements are deleted.Java Arraylist implements list interface.

Java ArrayList is part of collection framework.Java ArrayList can have any number of null values.It is designed to hold heterogeneous collections of objects. java ArrayList is widely used because of its functionality and flexibility.Java ArrayList preserves insertion order.java ArrayList allows duplicate elements.