JavaWorld Core Java

• Java 101: Java polymorphism and its types May 30, 2019
  Polymorphism refers to the ability of some entities to occur in different forms. It is popularly represented by the butterfly, which morphs from larva to pupa to imago. Polymorphism also exists in programming languages, as a modeling technique that allows you to create a single interface to various operands, arguments, and objects. Java polymorphism results […]
• Java tip: Fields and methods in Java May 16, 2019
  The Java tutorial Java 101: Classes and objects in Java introduces the fundamentals of Java classes and objects, including how to declare classes, describe attributes via fields, describe behaviors via methods, initialize objects via constructors, and instantiate objects from classes and access their members. To read this article in full, please click here(Insider Story)
• Java 101: Inheritance in Java, Part 2: Object and its methods May 7, 2019
  Java provides a standard class library consisting of thousands of classes and other reference types. Despite the disparity in their capabilities, these types form one massive inheritance hierarchy by directly or indirectly extending the Object class. This is also true for any classes and other reference types that you create.The first half of this tutorial on […]
• Java 101: Inheritance in Java, Part 1: The extends keyword May 7, 2019
  Java supports class reuse through inheritance and composition. This two-part tutorial teaches you how to use inheritance in your Java programs. In Part 1 you'll learn how to use the extends keyword to derive a child class from a parent class, invoke parent class constructors and methods, and override methods. In Part 2 you'll tour java.lang.Object, […]
• Java 101: Classes and objects in Java May 7, 2019
  Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This tutorial teaches you how to declare classes, describe attributes via fields, describe behaviors via methods, initialize objects via constructors, and instantiate objects from classes and access their members. Along the way, you'll also learn about setters and getters, method overloading, […]
• Java 101: Loop, switch, or take a break? Deciding and iterating with Java statements May 1, 2019
  Java applications evaluate expressions in the context of statements, which are used for tasks such as declaring a variable, making a decision, or iterating over statements. A statement can be expressed as a simple or a compound statement: A simple statement is a single standalone instruction for performing a task; it must be terminated with […]
• Java 101: Evaluate Java expressions with operators April 30, 2019
  Java applications process data by evaluating expressions, which are combinations of literals, method calls, variable names, and operators. Evaluating an expression typically produces a new value, which can be stored in a variable, used to make a decision, and so on.In this tutorial, you will learn how to write expressions for your Java programs. In […]
• OpenJDK proposal takes aim at verbose Java syntax April 29, 2019
  Java would gain records and sealed types capabilities as part of a draft JDK enhancement proposal intended to address complaints that Java is too verbose and requires too much “ceremony” code. The proposal was initiated by Brian Goetz, Java language architect at Oracle.Records provide a compact syntax for declaring classes that are transparent holders for […]
• Java 101: Elementary Java language features April 23, 2019
  Java is an object-oriented programming language, but there's more to Java than programming with objects. This tutorial is the first of several introducing non-object-oriented features and syntax that are fundamental to the Java language. You'll learn how to use comments, identifiers, types, literals, and variables in your Java programs. You'll also learn why and how […]
• Java 101: Learn Java from the ground up April 18, 2019
  So, you want to program in Java? That's great, and you've come to the right place. The Java 101 series provides a self-guided introduction to Java programming, starting with the basics and covering all the core concepts you need to know to become a productive Java developer. This series is technical, with plenty of code […]