JavaWorld Core Java

• Java Challengers #5: Sorting with Comparable and Comparator in Java November 29, 2018
  Programmers frequently need to sort elements from a database into a collection, array, or map. In Java, we can implement whatever sorting algorithm we want with any type. Using the Comparable interface and compareTo() method, we can sort using alphabetical order, String length, reverse alphabetical order, or numbers. The Comparator interface allows us to do […]
• Java proposal would spot data races with a thread sanitizer November 29, 2018
  Java’s HotSpot virtual machine could be fitted with a race-detection tool and other monitoring capabilities, under a proposal being floated in the OpenJDK community.  A data race in a Java program makes the program incorrectly synchronized, which leads to erroneous, nondeterministic, and unexpected behaviors.Called the Atlantis Project, the effort would explore possibilities for integrating HotSpot […]
• Write a purely functional Bubble Sort application November 12, 2018
  Neal Ford coined the term functional thinking to describe the mental shift required from developers trained primarily in object-oriented programming, who want to integrate functional programming concepts and techniques into their practice. I applied this concept in my two-part tutorial, "Functional programming for Java developers." In Part 1, I introduced five functional programming techniques written […]
• Functional programming for Java developers, Part 2 November 12, 2018
  Welcome back to this two-part tutorial introducing functional programming in a Java context. In Part 1 I used JavaScript examples to get you started with five functional programming techniques: pure functions, higher-order functions, lazy evaluation, closures, and currying. Presenting those examples in JavaScript allowed us to focus on the techniques in a simpler syntax, without […]
• JDK 12 roadmap: The new features coming to Java 12 November 6, 2018
  The first beta builds—Build 18—of Java Development Kit (JDK) 12, the next version of Java SE, are now available from Oracle for Linux, Windows, and MacOS.To read this article in full, please click here(Insider Story)
• Java 101: Functional programming for Java developers, Part 1 October 30, 2018
  Java 8 introduced Java developers to functional programming with lambda expressions. This Java release effectively notified developers that it's no longer sufficient to think about Java programming only from the imperative, object-oriented perspective. A Java developer must also be able to think and code using the declarative functional paradigm.This tutorial presents the basics of functional […]
• Real-time data processing with data streaming: new tools for a new era September 27, 2018
  Today, there are many data sources—such at IoT devices, user interaction events from mobile applications, financial service transactions, and health monitoring systems—that broadcast critical information in real time. Developers working with these data sources need to think about the architecture to capture real time streaming data at varying scales and complexities.To read this article in full, […]
• Java Challengers #4: Comparing Java objects with equals() and hashcode() September 20, 2018
  In this Java Challenger you’ll learn how equals() and hashcode() combine to make object comparisons efficient and easy in your Java programs. Simply put, these methods work together to verify if two objects have the same values.  Without equals() and hashcode() we would have to create very large "if" comparisons, comparing every field from an […]
• What is the JRE? Introduction to the Java Runtime Environment September 11, 2018
  Together, the Java Development Kit (JDK), the Java Virtual Machine (JVM), and the Java Runtime Environment (JRE) form a powerful trifecta of Java platform components for developing and running Java applications. I've previously introduced the JDK and JVM. In this quick tutorial, you'll learn about the JRE, which is the runtime environment for Java.Practically speaking, a […]
• Java 101: Mastering Java exceptions, Part 2 August 21, 2018
  JDK 1.0 introduced a framework of language features and library types for dealing with exceptions, which are divergences from expected program behavior. The first half of this article covered Java's basic exception handling capabilities. This second half introduces more advanced capabilities provided by JDK 1.0 and its successors: JDK 1.4, JDK 7, and JDK 9. Learn […]