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    <p>This <a href="http://crfdesign.net/programming/top-10-differences-between-java-and-c" rel="noreferrer">guy here</a> had to make the inverse transition. So he listed the top 10 differences of Java and C#. I'll take his topics and show how it is made in Java:</p> <h2>Gotcha #10 - Give me my standard output!</h2> <p>To print to the standard output in Java:</p> <pre><code>System.out.println("Hello"); </code></pre> <h2>Gotcha #9 - Namespaces == Freedom</h2> <p>In Java you don't have the freedom of namespaces. The folder structure of your class must match the package name. For example, a class in the package <em>org.test</em> must be in the folder <em>org/test</em></p> <h2>Gotcha #8 - What happened to super?</h2> <p>In Java to refer to the superclass you use the reserved word <code>super</code> instead of <code>base</code></p> <h2>Gotcha #7 - Chaining constructors to a base constructor</h2> <p>You don't have this in Java. You have to call the constructor by yourself</p> <h2>Gotcha #6 - Dagnabit, how do I subclass an existing class?</h2> <p>To subclass a class in Java do this:</p> <pre><code>public class A extends B { } </code></pre> <p>That means class <code>A</code> is a subclass of class <code>B</code>. In C# would be <code>class A : B</code></p> <h2>Gotcha #5 - Why don’t constants remain constant?</h2> <p>To define a constant in Java use the keyword <code>final</code> instead of <code>const</code></p> <h2>Gotcha #4 - Where is <code>ArrayList</code>, <code>Vector</code> or <code>Hashtable</code>?</h2> <p>The most used data structures in java are <code>HashSet</code>, <code>ArrayList</code> and <code>HashMap</code>. They implement <code>Set</code>, <code>List</code> and <code>Map</code>. Of course, there is a bunch more. Read more about collections <a href="http://java.sun.com/docs/books/tutorial/collections/index.html" rel="noreferrer">here</a></p> <h2>Gotcha #3 - Of Accessors and Mutators (Getters and Setters)</h2> <p>You don't have the properties facility in Java. You have to declare the gets and sets methods for yourself. Of course, most IDEs can do that automatically.</p> <h2>Gotcha #2 - Can't I override!?</h2> <p>You don't have to declare a method <code>virtual</code> in Java. All methods - except those declared <code>final</code> - can be overridden in Java.</p> <h2>And the #1 gotcha…</h2> <p>In Java the primitive types <code>int</code>, <code>float</code>, <code>double</code>, <code>char</code> and <code>long</code> are not <code>Object</code>s like in C#. All of them have a respective object representation, like <code>Integer</code>, <code>Float</code>, <code>Double</code>, etc.</p> <p>That's it. Don't forget to see <a href="http://crfdesign.net/programming/top-10-differences-between-java-and-c" rel="noreferrer">the original link</a>, there's a more detailed discussion.</p>
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    1. COGotcha #9 is not enforced in the Blackberry JDE, though if you plan to use Eclipse or other IDEs you probably want to abide by it.
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