programming in java after 10 years of break

1 minute read

I learned java at Uni. and worked really hard. Yet, I didn't have chance to use it when I becaue a full time programmer.
I was a Delphi and VB guy and then C# man. I didn't plan it, but it turned out that my career was more oriented toward Microsoft Stack.

And, now I'm reading TDD By Example.
This is my third read, and I thought it might be fun to try the examples in java. Previously, I converted those examples to C# code.
So, this is my experience with java.

Java IDE

You need an ide to code. as I am a loyal ReSharper user, my first choic was IntelliJ. It was funny, that most of things I loved about ReSharper, actually came from IntelliJ.
Community Edition is free.

Hello World

Writing "Hello, World!" is a challenge, if you do not know the eco-system of the language. Java syntax is very similar to C#, yet I didn't know how to write a simple console application. jetbrains' wiki had a nice tutorial about how to create the first java application.

This is my code, nothing clever or unusual.

[sourcecode language="java"]
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");

Now, next challenge is to write the first unit test. I have no idea how to add junit. I wanted to trust IntelliJ and added @Test attribute (not sure if this is called attribute) and used "Press Alt + ENTER" that works for all. And it added junit-4.10.jar to external libraries. Also, it's interesting that import works like "org.junit.Assert.*" I thought by specifying "org.junit.Assert", all methods that belong to Assert would come, but I had to use *. It's different from C#'s name space. JUnitQuickTutorial helped me to get started.

[sourcecode language="java"]

package com.example.helloworld;

import org.junit.Test;
import static org.junit.Assert.*;

* Created with IntelliJ IDEA.
* User: andrew.chaa
* Date: 07/08/12
* Time: 11:12
* To change this template use File | Settings | File Templates.
public class HelloWorldTest {
public void test_true() {


For more instructions on juni, please go