In the post ArrayList Internal Implementation in Java we have already seen the internal implementation details of one of the implementation of the List interface – ArrayList. In this post we’ll see LinkedList internal implementation in Java which is another implementation of the List interface Questions that may come up…
In the post How to Convert ArrayList to Array in Java we have already seen different ways of doing that conversion. This post is about the other way round how to convert array to ArrayList in Java. Options for converting array to ArrayList in Java Using Arrays.asList() method. See example.…
In this post we’ll see how to sort ArrayList of objects in Java. In the post How to Sort ArrayList in Java we have already seen how you can sort ArrayList of String, Date or any Wrapper class (Integer, Float etc.). All those classes already implement Comparable interface so you…
This post shows how to synchronize ArrayList in Java and what other thread safe alternatives are available to use. ArrayList in Java is not thread safe as it is not synchronized by default. If you are using ArrayList in a multi-threaded environment where it is accessed by multiple threads concurrently…
In Java there is an Iterator interface which provides an iterator over a collection (List, Set etc.) but there is another interface ListIterator in Java which provides an iterator exclusively for lists like ArrayList, LinkedList, CopyOnWriteArrayList. While iterator can only move forward, ListIterator provides functionality to traverse the List in…
If you need to remove or delete an element from ArrayList in Java, you have 3 options. Using the remove() method of the ArrayList class to remove element. See example. Using the remove() method of the iterator returned by ArrayList. See example. Using the removeIf() method Java 8 onward. See…
ArrayList internal implementation in Java or how does ArrayList work internally in Java is a very important interview question. Some of the questions that may come up are- Where does ArrayList store its element? What is the initial or default capacity of ArrayList and how ArrayList of that capacity is…
ArrayList in Java is an ordered collection in the sense that it maintains the insertion order of the elements but sometimes you may have a requirement to sort an ArrayList in ascending order or descending order. In this post we’ll see How to sort an ArrayList in Java. Table of…
In this post we’ll see different ways to iterate an ArrayList in Java. Your options to iterate an ArrayList are as follows- Using normal for loop Using For-Each loop (Advanced for loop), available from Java 5 Using Iterator or ListIterator (Use ListIterator only if you want to iterate both forward…
In Java Collections framework there are two general-purpose List implementations— ArrayList and LinkedList. In this post we’ll see the differences between ArrayList and LinkedList in Java to understand these two implementations better. Knowing the differences between ArrayList and LinkedList will also help you to determine which implementation is better in…
