Using array vs arraylist code#

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Array has length variable which gives the length of the array.

Since ArrayList stores only objects so memory usage is also more than the array. But there is some overhead in case of ArrayList if there are more elements and the internal array has to be resized. Objects internally and both are index based.

Performance wise both Array and ArrayList are almost similar as ArrayList also uses array of.

If a list, which should store only Integers, is needed it should be defined as- List myList = new ArrayList() Of any other type will result in ArrayStoreException. In case of ArrayList, generics brought the much needed type safety which, as shown above, is not requiredДЇor Array as type of elements stored in the array is specified at the array creation time itself, trying to store element

Using array vs arraylist code#

Where as following code throws compile time error ' Type Mismatch'.

For example following code throws ArrayStoreException. ' ArrayStoreException' if it is not able to resolve it at run time. Since Array knows the type of the data which it can hold so it will give compiler error ' Type Mismatch' or Difference number 2 between array and ArrayList also indicates one more difference, which is about ' type safety'.Wrapper class Integer- List myList = new ArrayList() In case of ArrayList if you want to store integers then you have to do this, note the use of Or, if you have a class Employee and you want an array of size 5 to hold 5 Employee objects then- Employee employees = new Employee Though Autoboxing and Unboxing has blurred that difference, but the important point to note here is that in case of ArrayListДЄny primitive data type is still wrapped and stored as an Object.ДЇor example, if you want an array of primitive type int- int intArray = new int Array can store both primitive types as well as objects whereas ArrayList can store only objects.Refer: How ArrayList works internally in Java to know more about the internal implementation of ArrayList. Is not able to fit in the number of elements stored in the ArrayList. Object internally, but it has the logic to keep growing the size of the array as and when previous size

Whereas ArrayList is dynamic and that is why also known as dynamic array.

First and the most important difference is Array is static and can't be resized once declared.

In this post we'll see some of the differences between ArrayList and Array in terms of how they are initialized and Though performance wise both Array and ArrayList may give almost similar performance but functionality wise they both are used in quite different scenarios. Difference between Array and ArrayList in Java is one question you may come across in a Java technical interview.