Java 7 conference at UAO - Summary

Hello again. My participation at UAO's event "Día de la Informática y la Multimedia" was a success, I had my talk about Java 7 on Thursday September 20 and it went pretty well. It was a lot of fun, we had about 50-60 assistants, most of them students and some teachers. Few questions were asked at the end of the presentation, I post some of them here giving further explanation:


Q: What happens if there are exceptions when the try with resources automatically calls the close method?
A: The new Interface java.lang.AutoCloseable defines only one method: close():void which throws a java.lang.Exception. So when you define your resources in a try with resources structure, the compiler will warn you about catching the exception. So, whichever exception is thrown during the execution of the close():void method, you will be able to catch it in your try with resources structure.
Something I didn't mention during the presentation, is that there are new methods in the java.lang.Throwable class that allows you to keep track of all the exceptions that were suppressed in order to deliver a specific exception. The methods are:

• +addSuppressed(java.lang.Throwable):void
• +getSuppressed():java.lang.Throwable[]

Q: What about IPv6 support in Java 7?
A: According to this documentation, Java began supporting IPv6 since J2SE 1.4 back in February 2002, but only Solaris and Linux OS were supported. Since version J2SE 1.5 Windows OS is also supported. Even though, there are some considerations you should be aware of if you want your java IPv4 applications running on IPv6, for example:

• There should not be direct references to IPv4 addresses; instead, hostnames should be used.
• Use java.net.InetAddress instead of the subclasses java.net.Inet4Address and java.net.Inet6Address, when possible. Only use the subclasses when you need to access protocol-family-specific behaviors.

Q: Any support for 3D?
A: Java 3D is a special API that enables the creation of three-dimensional graphics applications and Internet-based 3D applets. It is not part of the Java SE so you have to download it and add it to your application libraries. For more information about this API, check its official home page.

Q: What else has Java for developers?
A: The Java platform offers a lot to developers, it allows them to build cross-platform applications. "Write once, run everywhere" is a serious thing to Java. It is everywhere from PCs, to TVs, phones, mobile devices, bluerays,  kindles... etc. The features that every release of Java SE offers are the base of the Java platform.


Java 7, 1+ año después
That was the name of my presentation and you can download it using the following link: Download PDF File

More info about the event can be found here (spanish).

See ya!