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Vector and ArrayList require more space as more elements are added. This indexing scheme is indicative of the close relationship in C++ between pointers and arrays and the rules that the language defines for pointer arithmetic. In this post we will discuss the difference and similarities between ArrayList and Vector. The main difference between ArrayList and Vector lies in synchronization. ArrayList and Vector collections are used interchangeably for storing several items with the same type inside the memory. The iterator and listIterator returned by these classes (Vector and ArrayList) are fail-fast. They are dynamically resizable. ArrayList is non-synchronized so there is no time lapse in thread safety. Vector and ArrayList are index based and backed up by an array internally. The HashMap and ArrayList are two of the most popular classes from Java Collection framework. Also if we know the differences and similarities between ArrayList and Vector, it will be easier for us to … 1- Similarities. I created an empty list and named itcost_array. Similar to a List, the size of the ArrayList is increased automatically if the collection grows or shrinks if the objects are removed from the collection. Both classes are members of the Java Collections Framework and implements the List interface. Difference between ArrayList and HashMap in Java One of the most critical difference between HashMap and ArrayList class is that former is the implementation of the hash table while later is a dynamic array which can resize itself. An array is a basic functionality provided by Java, whereas ArrayList is a class of Java Collections framework. (because 2 threads on same Vector object cannot  access it at same time). Both ArrayList and Vector maintains the insertion order of element. Vector is similar with ArrayList, but it is synchronized. to override), CORE JAVA - Top 120 most interesting and important interview questions and answers in core java, Core Java Tutorial in detail with diagram and programs - BEST EXPLANATION EVER. What is ArrayList? Difference between ArrayList and Vector . 1- Similarities. The iterator and listIterator returned by these classes (Vector and ArrayList) are fail-fast. In this post, we will discuss the differences and similarities between ArrayList and Vector in Java. to show advantage of using Vector in multithreading environment. This has been a guide to the top differences between C++ Vector … Vector. Similarities between Vector and ArrayList. To begin with, let’s take a look at some of the similarities between Arraylist and Vector. Unlike a normal array, the size of a dynamic array is not fixed. ArrayList is not synchronized, hence its operations are, Vector is synchronized, hence its operations are. 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