Programming Corner

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. The assert keyword enables you to test an assumption about a part of your program. If the assertion is proven to be true, execution of your program will continue. If it's proven to be false, an AssertionError will be thrown. Assertions confirm your assumptions about the behavior of your program, thus increasing confidence that the program is free of errors. This keyword has been part of the Java language since Java 1.4.2 and yet, very l...

This article summarize the use of the keyword static . I suggest you review Java Keywords (Part V): Classes vs Interfaces and Java Keywords (Part IX): Switch Statements before proceeding. 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. Very early in this series, I discussed the use of the keyword static and mentioned that I would leave for later discussion another use of that keyword. Well, the time has come. Using static method in interfaces Let me start by saying that the only re...

This article summarize the use of the keyword default . I suggest you review Java Keywords (Part V): Classes vs Interfaces and Java Keywords (Part IX): Switch Statements before proceeding. 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. Up until Java 8 (released in March, 2014), the default keyword had a single purpose, which was to indicate the default case in a switch statement. To illustrate quickly String color = "red"; switch(color) { case "red": case ...

We are up to 40 keywords covered in previous articles! That's 83% keywords covered. We have only 8 keywords to cover and I will be covering 1 of those in this article. We are almost done with all the basic keywords. This article will illustrate the use of the keyword super . 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 series was written with natural progression in mind. Therefore, some of the keywords already covered may be used in code examples illustrated here. Java keyword list abstract continue for new switch assert default goto * package synchronized boolean do if private this break double implements protected throw ...

We are up to 39 keywords covered in previous articles! That's 81% keywords covered. We have only 9 keywords to cover and I will be covering 1 of those in this article. We are almost done with all the basic keywords. This article will illustrate the use of the keyword this . 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 series was written with natural progression in mind. Therefore, some of the keywords already covered may be used in code examples illustrated here. Java keyword list abstract continue for new switch assert default goto * package synchronized boolean do if private this break double implements protected throw ...

We are up to 38 keywords covered in previous articles! That's 79% keywords covered. We have only 10 keywords to cover and I will be covering 1 of those in this article. We are almost done with all the basic keywords. This article will illustrate the use of the keyword instanceof . 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 series was written with natural progression in mind. Therefore, some of the keywords already covered may be used in code examples illustrated here. Java keyword list abstract continue for new switch assert default goto * package synchronized boolean do if private this break double implements protected ...

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...

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...

We are up to 34 keywords covered in previous articles! That's 71% keywords covered. We have only 16 keywords to cover and I will be covering 2 of those in this article. This article will illustrate the use of the keywords implements and extends for implementing functionality outlined in interfaces as well as extending the functionality of a class. 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 series was written with natural progression in mind. Therefore, some of the keywords already covered may be used in code examples illustrated here. Java keyword list abstract continue for new switch assert default goto * package synchronized ...