JavaWorld Core Java

• What is the JDK? Introduction to the Java Development Kit August 9, 2018
  The Java Development Kit (JDK) is one of three core technology packages used in Java programming, along with the JVM (Java Virtual Machine) and the JRE (Java Runtime Environment). It's important to differentiate between these three technologies, as well as understanding how they're connected: The JVM is the Java platform component that executes programs. The […]
• Java Challengers #3: Polymorphism and inheritance July 19, 2018
  According to the legend Venkat Subramaniam, polymorphism is the most important concept in object-oriented programming. Polymorphism--or the ability of an object to execute specialized actions based on its type--is what makes Java code flexible. Design patterns like Command, Observer, Decorator, Strategy, and many others created by the Gang Of Four, all use some form of […]
• Java 101: Mastering Java exceptions, Part 1 June 26, 2018
  Java exceptions are library types and language features used to represent and deal with program failure. In the first half of this article you'll learn about basic language features and library types that have been around since Java 1.0. In the second half you'll discover advanced capabilities introduced in more recent Java versions. If you've […]
• Java 101: Datastructures and algorithms in Java, Part 5 June 8, 2018
  In Part 4, I introduced all the things you can do with singly linked lists and their algorithms in Java. While singly linked lists have many uses, they also present some restrictions. For one thing, singly linked lists restrict node traversal to a single direction: you can't traverse a singly linked list backward unless you […]
• Java Challengers #2: String comparisons May 30, 2018
  In Java, the String class encapsulates an array of char. Put simply, String is an array of characters used to compose words, sentences, or any other data you want.Encapsulation is one of the most powerful concepts in object-oriented programming. Because of encapsulation, you don’t need to know how the String class works; you just need […]
• Oracle plans to dump risky Java serialization May 24, 2018
  Oracle plans to drop from Java its serialization feature that has been a thorn in the side when it comes to security. Also known as Java object serialization, the feature is used for encoding objects into streams of bytes. Used for lightweight persistence and communication via sockets or Java RMI, serialization also supports the reconstruction of […]
• What is the JVM? Introducing the Java virtual machine May 22, 2018
  The Java virtual machine is a program whose purpose is to execute other programs. It's a simple idea that also stands as one of our greatest examples of coding kung fu. The JVM upset the status quo for its time, and continues to support programming innovation today.Use and definitions for the JVM The JVM has […]
• Java Challengers #1: Method overloading in the JVM April 25, 2018
  Welcome to the new Java Challengers blog! This blog is dedicated to challenging concepts in Java programming. Master them and you will be well on your way to becoming a highly skilled Java programmer.The techniques in this blog take some effort to master, but they’ll make a great difference in your daily experience as a […]
• Java 101: Datastructures and algorithms in Java, Part 4 March 29, 2018
  Like arrays, linked lists are a fundamental datastructure category upon which more complex datastructures can be based. Unlike a sequence of elements, however, a linked list is a sequence of nodes, where each node is linked to the previous and next node in the sequence. Recall that a node is an object created from a […]
• Java 11 roadmap: The new features you can expect March 23, 2018
  Now that Oracle has released Java Development Kit 10, the next version, JDK 11, is just around the corner. Due in September 2018 as part of Oracle’s new six-month release cadence for the standard edition of Java, Version 11 has just a handful of announced features so far.Java 11 is also set to lose some […]