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hellofadude's blog

Java's regular expression, String, and things..

Posted by hellofadude on March 31, 2014 at 10:29 AM PDT

The manipulation of strings is a quite common activity for which the programmer undertakes responsibility fairly frequently. In Java, strings are of a distinct data type, that are implemented as literal constants.

Explaining Java's error handling system

Posted by hellofadude on March 5, 2014 at 10:16 PM PST

In this post, I try to give a reasonable account of Java's error handling system being as it is that the handling of errors is a concern that any reasonable programming language must find some way to contend with. Java's error handling methodology is based on an idea of exceptions.

Using inner and nested Java classes

Posted by hellofadude on February 20, 2014 at 7:12 PM PST

If you have followed previous posts, you might begin to perceive a pattern in the semantics of the Java programming language. If not, it might help to go over previous posts as I tend to return to expand on previous topics or add clearer examples as time permits. Inner classes might at first seem like a whole new language to the uninitiated but they are a nice feature in Java that allow you to logically group related classes and control the visibility of one class from outside of the other.

An overview of Java's container classes

Posted by hellofadude on February 12, 2014 at 10:41 AM PST

In the normal course of solving a general programming problem, it is almost certain that you will become compelled to create, and identify useful ways by which one may hold any number of objects within your program. In Java, you are normally inclined toward the array as the natural choice for holding a group of primitives, but this has the obvious limitation of being of a fixed size, whereas, under normal circumstances, you are unlikely to know before hand, the number of objects, or indeed anything about their type before run-time.

Java interfaces and the concept of multiple inheritance

Posted by hellofadude on January 18, 2014 at 3:07 PM PST

Interfaces are completely abstract classes in Java that provide you with a uniform way to properly delineate the structure or inner workings of your program from its publicly available interface, with the consequence being a greater amount of flexibility and reusable code as well as more control over how you create and interact with other classes.

Polymorphism in Java

Posted by hellofadude on January 7, 2014 at 1:16 PM PST

In object oriented programming, polymorphism is a feature that allows you to provide a single interface to varying entities of the same type. This is analogous to the interpretation of the same concept in the field of Biology.

To understand how this works in Java, we must consider inheritance and the ways by which the Java programming language makes method calls.

How to reuse your Java classes

Posted by hellofadude on December 18, 2013 at 11:24 AM PST

One of the most compelling features about an OOP language like Java is that it provides a way to reuse code to add functionality within the classes you create. Essentially, when writing code in Java, seldom are you required to begin from scratch because the Java library comes with a great many classes that make it easy for you to attain a minimum level of functionality with relative ease.

Controlling access with implementation hiding in Java

Posted by hellofadude on December 8, 2013 at 6:28 PM PST

A key consideration for the library designer in the normal conduct of operations is maintaining the ability to make changes or improvements to the library at any time without requiring the consumers (client programmers) of that library to do the same. In Java, a library consists of a logical grouping of .class files packaged together to make a working program.

Understanding Java's flow of execution

Posted by hellofadude on December 4, 2013 at 2:49 PM PST

Java uses conditional statements to determine the execution path. Conditional statements provide a way to determine the truth or falsehood of a conditional expression, by which we mean to describe expressions that make use of relational operators and such, and that are able to produce a boolean value.

Safely initialising your Java objects

Posted by hellofadude on November 19, 2013 at 6:58 PM PST

The proper initialisation of objects is a concern that has primarily to do with safety in programming. In some programming languages, failing to properly initialise a variable or library component before attempting to use it can lead to very many bugs in your software that may be difficult to locate, however we are fortunate that Java takes a sensible approach to these matters.