Java anyone?

Category: Tutorials — Author: GerDoyle on Nov 16 with 21 comments

Hey guys.. I’ve been learning Java in College.. I think it’s a pretty cool language.. I am going to post up a few lessons / tutorials on Anto’s blog (If he doesn’t object lol)It will help me memorize along with maybe teaching you great readers :) :P

To start off with I’m going to go through the very basics (as thats as far as I know) :P but you need to take baby steps before you can leap….

Also before I start, or before you start I should stay, you should have an up-to-date JDK and a program such as BlueJ or Eclipse.. I’d prefer Eclipse as it’s easier to use. You can also just use Note pad and run the Java Program from Command Line (Which I will show how to do later on.

Ok lets start,

//Program that will print out the message "Hello World!"
//This is the most simplest program there is out there.

public class example {

 public static void main(String[] args) {

 System.out.println("Hello World!");

 }

}

Ok. In any program where ever you see the forward slashes “//” This means the compiler will not read this line. This is called a comment.
It’s important to use comments, in case you forget what you are doing..

You should memorize

public class example {

 public static void main(String[] args) {

This is used in any program, besides “example” as this changes according to what ever name you make it.
Notice the curly braces { { these are important and tell the compiler where the program starts and ends.
The compiler holds no prisoners and will not work if you have made any little mistake, this includes your curly braces and more which we’ll get to soon enough.

System.out.println("Hello World!");

This uses the System function to print out a sentence or word or character or number or whatever..
Notice the capital S with System, you must use a capital, no matter where or when you use this line of code.
The semi-colon tells the compiler that that is the end of that line of code.
You must use your semi-colons where needed, if not your compiler will not run the program.

The writing between the inverted quotations and brackets is what’s going to be printed out to the screen.

You must use the inverted quotations and the brackets, these are all basic rules of Java.

the end curly braces denotes the end of the program and class.

}
}

Some of this might seem like “wtf” but it’s ok. You should keep trying this over and over again. I’ll be adding more lessons as time goes on, I should get one in tomorow.

Best way to learn all this gibberish is practice, practice and more practice!

number of view: 47