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Java Keywords (Part XXIV): native

Java keyword list abstract continue for new switch assert default goto * package synchronized boolean do if private this break double implements protected throw byte else import public throws case enum instanceof return transient catch extends int short try char final interface static void class finally long strictfp volatile const * float native super while Keyword marked with an asterisk (*) are keywords that, although valid, are not used by programmers. This is the last chapter of the Java Keyword series. This is probably the keyword I have used the least. In my 20 year career as a software developer, I have used this keyword once, and that was to make some addition to legacy code. The keyword native is a method modifier . Basically, it is a keyword that can only be applied to methods. According to the Java Language Specification (JLS), A method that is native is implemented i...
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Enforce non-instantiability with private constructors

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Use Java enum to create Singletons

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Using Builder Pattern with Class Hierarchies

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Static Factory Method

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The Builder Pattern (using immutability)

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The Beauty of the Null Object Pattern

Before we start... Let me start by saying this: NEVER dismiss an idea without giving it any consideration. That was the mistake I made when I first encountered an article about this design pattern many years ago. I was thrown off by the name and without even attempting to find out what this design pattern was all about, I moved on to other things. That was a huge mistake and I am not afraid to admit it. I urge you not to make that mistake. And if you have already, never make that mistake again. Trust me, you will thank me later. For now, let me tell you my story and attempt to explain when to use it along with a simple example on how to implement this pattern. The Null Object Pattern By definition, the main purpose of this pattern is to have an Object-Oriented alternative to the absence of objects by creating objects that display "do nothing" behavior. That sounds like a mouthful. In simplest terms, it is meant to provide a mechanism to replace null references w...
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Java Keywords (Part XIII): Import Keyword and the Concept of Java Packages

We are up to 36 keywords covered in previous articles! That's 75% keywords covered. We have only 12 keywords to cover and I will be covering 2 of those in this article. I am so excited about getting to nearly the end of the series. As I mentioned before, knowing the Java keywords and being able to explain their usage correctly, is something that you will most likely need in an entry level Java programmer job interview. If this ever helps one of you, I would love to hear from you! This article will illustrate the use of the keywords import and package . This is going to be a very short article. I promise. I suggest you start with Java Keywords (Part I) before proceeding further, if you have not read any of the previous articles in the Java Keyword series. Also, go back and read the one about Data Types. All of these articles are from September 2018. That should help you find them quickly. You can also use the "search" option at the top of this page. The se...
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