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Flattening Nested Collections in Java 1. Overview In this quick article, we’ll explore how to flatten a nested collection in Java. 2. Example of a Nested Collection Suppose we have a list of lists of type String. List<List<String>> nestedList = asList( asList(“one:one”), asList(“two:one”, “two:two”, “two:three”), asList(“three:one”, “three:two”, “three:three”, “three:four”)); 3.… Continue Reading java-flatten-nested-collections

Immutable ArrayList in Java 1. Overview This quick tutorial will show how to make an ArrayList immutable with the core JDK, with Guava and finally with Apache Commons Collections 4. This article is part of the “Java – Back to Basic” series here on Baeldung. Further reading: Collect a Java… Continue Reading java-immutable-list

Multi Dimensional ArrayList in Java 1. Overview Creating a multidimensional ArrayList often comes up during programming. In many cases, there is a need to create a two-dimensional ArrayList or a three-dimensional ArrayList. In this tutorial, we’ll discuss how to create a multidimensional ArrayList in Java. 2. Two-Dimensional ArrayList Suppose we want to represent… Continue Reading java-multi-dimensional-arraylist

Checking If a List Is Sorted in Java 1. Overview In this tutorial, we’ll see different ways to check if a list is sorted in Java. 2. Iterative Approach The iterative approach is a simple and intuitive way to check for a sorted list. In this approach, we’ll iterate the… Continue Reading java-check-if-list-sorted

Removing an Element From an ArrayList 1. Overview In this tutorial, we’re going to see how to remove elements from an ArrayList in Java using different techniques. Given a list of sports, let’s see how we can get rid of some elements of the following list: List<String> sports = new… Continue Reading java-arraylist-remove-element

A Guide to the Java LinkedList 1. Introduction LinkedList is a doubly-linked list implementation of the List and Deque interfaces. It implements all optional list operations and permits all elements (including null). 2. Features Below you can find the most important properties of the LinkedList: Operations that index into the… Continue Reading java-linkedlist

Converting Iterator to List 1. Overview In this short tutorial, we’ll learn how to convert an Iterator to a List in Java. We’ll cover a few examples using a while loop, Java 8, and a few common libraries. We’ll use an Iterator with Integers for all our examples: Iterator<Integer> iterator… Continue Reading java-convert-iterator-to-list

Filtering a Java Collection by a List 1. Overview Filtering a Collection by a List is a common business logic scenario. There are plenty of ways to achieve this. However, some may lead to under-performing solutions if not done properly. In this tutorial, we’ll compare some filtering implementations and discuss… Continue Reading java-filter-collection-by-list