With the continuous increase in core memory available, Java arrays are. In the following example, we have simply created an array of length four. List, BigList, AbstractList, AbstractBigList, ArrayList, BigArrayBigList. Java provides the add() method to add elements in the ArrayList. We can add elements in an array by using the assignment operator. We cannot use generics along with array because it is not a convertible type of array.ДЄrrayList allows us to store only generic/ type, that's why it is type-safe.ДЄrray provides a length variable which denotes the length of an array.ДЄrrayList provides the size() method to determine the size of ArrayList. We use an iterator to iterate over ArrayList. We use for loop or for each loop to iterate over an array. it may contain whatever values were left in memory from previous allocation. It automatically converts primitive type to object. A dynamic array is a random access, variable-size list data structure that. We cannot store primitive type in ArrayList. The resize operation in ArrayList slows down the performance.ДЄn array can store both objects and primitives type. It performs fast in comparison to ArrayList because of fixed size.ДЄrrayList is internally backed by the array in Java. We can create an instance of ArrayList without specifying its size. It is mandatory to provide the size of an array while initializing it directly or indirectly. It contains popular classes like Vector, HashTable, and HashMap.ДЄn array is a fixed-length data structure.ДЄrrayList is a variable-length data structure. The ArrayList is a class of Java Collections framework. Each time an element is added or removed, a new array is created. ArrayList internally uses dynamic array for storing elements. ArrayList performance is less and uses more memory as compared to Array. It serves as a container that holds the constant number of values of the same type. Array provides better performance and uses less memory. The following table describes the key differences between array and ArrayList: BasisДЄn array is a dynamically-created object. They do not preserve the order of elements.Array and ArrayList both can store null values.Manipulating LinkedList takes less time compared to ArrayList because, in a doubly-linked list, there is no concept of shifting the memory bits. Whenever we remove an element, internally, the array is traversed and the memory bits are shifted. You can make ArrayList more memory-efficient and faster by pre-sizing it. Manipulating ArrayList takes more time due to the internal implementation. Array and ArrayList both are used for storing elements. To do that, it creates a bigger array (Java arrays cannot actually be resized).ArrayList arrayObj=new ArrayList()//object of ArrayListДЄrrayObj(new Integer(12)) //converts integer primitive to Integer object and added to ArrayList object

Java array vs arraylist memory