Java

URL: https://www.progressiverobot.com/java-hello-world-program/ Whenever we start to learn a programming language, the first program is always to print the Hello World. In the last article, we learned [how to install Java on Windows 10](/community/tutorials/java-windows-10-download-install). Now we are ready to write and run our first Hello World Java program. Java Hello World Program To keep things simple […]

URL: https://www.progressiverobot.com/java-lock-example-reentrantlock/ Welcome to Java Lock example tutorial. Usually when working with multi-threaded environment, we use [synchronized for thread safety](/community/tutorials/thread-safety-in-java). Java Lock  Most of the times, synchronized keyword is the way to go but it has some shortcomings that lead the way to inclusion of […]

URL: https://www.progressiverobot.com/java-remove-array-elements/ Introduction In Java, arrays are a fundamental data structure that allows us to store a collection of elements of the same data type. When we declare an array, we specify its data type and size, which is used by the Java Virtual Machine (JVM) to allocate the necessary memory for the array elements. […]

Java Collection classes are fail-fast which means that if the Collection will be changed while some thread is traversing over it using iterator, the iterator.next() will throw ConcurrentModificationException. This situation can come in case of multithreaded as well as single threaded environment.

URL: https://www.progressiverobot.com/json-simple-example/ json-simple is a simple java toolkit for JSON. json-simple library is fully compliance with JSON specification (RFC4627). json-simple  json-simple uses [Map](/community/tutorials/java-map) and [List](/community/tutorials/java-list) internally for JSON processing. We can use json-simple for parsing JSON data as well as writing JSON to file. One of the best feature […]

URL: https://www.progressiverobot.com/matrix-programs-in-java/ A Matrix is a rectangular array. The elements are arranged in the rows and columns. In this tutorial, we will look at some matrix programs in Java. Graphical Representation of Matrix Matrix in Java We can implement a matrix using [two dimensional array in Java](/community/tutorials/two-dimensional-array-java). The element at row "r" and column "c" […]

URL: https://www.progressiverobot.com/opencsv-csvreader-csvwriter-example/ OpenCSV is a lightweight java CSV parser. Today we will look into OpenCSV example for CSV parsing. OpenCSV  OpenCSV provides most of the basic features for CSV parsing. OpenCSV is more popular because we don't have any builtin CSV parser in java. Some of the important classes in […]

URL: https://www.progressiverobot.com/string-immutable-final-java/ Why String is immutable in Java is one of the popular interview questions. The string is one of the most used classes in any programming language. We know that String is immutable and final in Java. Java runtime maintains a [String pool](/community/tutorials/what-is-java-string-pool) that makes it a special class. Why String is immutable in […]