Java classes

Every Java program:

must have a class
starts from the main method
all code is within classes

Interfacing with Java classes

Protege export
Clojure
Org-mode code blocks
EMF – Ecore
Jena
JSON API for WordPress?

Java main method

To run our program, the main method must be identical to this signature

public static void main(String[ ] args)

Public : anyone can see it
Statuc : method can be run without creating an instance of the class containing the main method
Void : method doesn’t return any value
Main : name of the method

Main’s parameters are is an array of strings called args

Methods

A method is a collection of statements grouped together for an operation
Aka functions

Java syntax

In classes, methods, and other flow-control structures code is always enclosed in curly braces { }.
Each code statement must end with a semicolon ;

Comments

single-line comments start with two forwars slashes //
multi-line comments start with forwars slash followed by asterisk /* and end vice versa */

/* This is also a

comment spanning

multiple lines */

Documentation comments

generate external documentation of your source code
These begin with a forward slash followed by two asterisks, and end with an asterisk followed by a forward slash.

/** This is a documentation comment */
/** This is also a

documentation comment */

Javadoc is a tool which comes with JDK and it is used for generating Java code documentation in HTML format from Java source code which has required documentation in a predefined format.
When a documentation comment begins with more than two asterisks, Javadoc assumes that you want to create a “box” around the comment in the source code. It simply ignores the extra asterisks.

/**********************
This is the start of a method
***********************/

Variables

Variables store data for processing.

A variable is given a name (or identifier), such as area, age, height, and the like. The name uniquely identifies each variable, assigning a value to the variable and retrieving the value stored.
Variables have types. Some examples:

– int: for integers (whole numbers) such as 123 and -456

– double: for floating-point or real numbers with optional decimal points and fractional parts in fixed or scientific notations, such as 3.1416, -55.66.

– String: for texts such as “Hello” or “Good Morning!”. Text strings are enclosed within double quotes.
You can declare a variable of a type and assign it a value. Example:

String name = “Jason”;

This creates a variable called name of type String, and assigns it the value “Jason”.

You can use a comma-separated list to declare more than one variable of the specified type. Example:

int a = 42, b = 11;

println method

println method prints a line of text
The System class and its out stream are used to access the println method

{
System.out.println(“Hello World!”);
}

Hello world! Java

public class ExampleProgram {
public static void main(String[ ] args) {
System.out.println(“Hello World”);
}
}

How can I intergrate WordPress and Linked Data?

I’d like to have an SPARQL endpoint that could query query an offline data set on Android

WordPress for Android

How many posts can this thing handle?
Wish it had a search function ….Do I have to make an Android app with an JSON API … or maybe a searchable Atom/RSS feed? ….maybe there’s a Linked Data input option?

How to organize my files?

# State of the file system

I have been accumulating text files for about a decade
Plain text files are great for cross-platform future-proofing, flexibility VCS ect…..
I’m sure plenty of geeks can wrangle their text files just fine with git and text editors ….but it’s not a replacement for backup and sync …..
After many hoops, between machines my file system is lookin’ pretty convolded and I have some diffs to do
Emacs can handle thousands of text files no problem but neigjer my text editor nor files are that mobile friendly