Sat, 2 February 2013
You remember recursion right? that ugly, confusing thing they made you do either on CS-300, or at job interviews. Have you ever wondered how to make it safe and right? and why do we really use recursion? In this episode we go into proper recursion programming (and lose the fear of making it wrong), and understand why stacks get filled with it, and what problems do they really solve (answer, not many). In addition we talk about the nature of Double objects, vs double the primitive (And why it is so hard to do == comparisons in doubles), plus some little known things about Strings (like interning). In all it has a little bit for everyone, so take a listen! Follow And if you like what you hear, treat me a beer!
Hey it's winter (and not too many reasons to be outside, so might as well stay home and drink a few!) If you like what you hear, treat me a beer ! :) (It's the Java pub house after all :)
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Sun, 28 October 2012
And Shout out to Peter Hendriks and Tim Prijn for their presentation!(https://oracleus.activeevents.com/connect/sessionDetail.ww?SESSION_ID=4153). If interested, click on the 'media' icon on the right side! With the establishment of Java 7 as the de-facto JRE of Oracle, the clock is ticking down for Java 6! It will be End-Of-Life around February 2013, so we better get going and upgrade! In this episode we cover how to migrate to Java 7, and cover some of the most notable Java 7 features (Networking nuts, your prayers have been answered!) while preparing a path to upgrade. If you have a Java 6 (or 5 or 4) project, this is mandatory listening! If you just joined us, remember to follow me on Twitter! (@fguime) and IF you really really really really really really really really really really really really really REALLY like what you hear, treat me a beer!
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Wed, 10 October 2012
It is also our Birthday (We have been airing episodes for a year!)! Happy to celebrate with everyone a year of the podcast (and if you want to celebrate it, treat me a beer! :) ). With this episode we wrap the concept of generics and bounds (super / extends) and talk about type erasure (and compiler warnings that goes 'Hm, dunno what you're doing but I can't make sure it's right' And, that...is that! If you just joined us, remember to follow me on Twitter! (@fguime) and IF you like what you hear, treat me a beer! |
Fri, 14 September 2012
Episode 30. I always thought Generics were as good as brand name Erasers (Java Generics part 1) ---- Ah! and if you are going to JavaOne check my t-shirt on the previous post And if you just joined us, remember to follow me on Twitter! (@fguime) Also, we are getting close to our first BIRTHDAY!If you have followed us all year long, or just recently join us, and like what you hear, treat me a beer! |
Mon, 20 August 2012
We go and visit the Primordial Java Concepts. As rules set in stone we explore the concept of multiple inheritance, method and variable scope (including the final keyword), abstract methods and @override. This is good for those starting up their Mad Java SkillZ (We're L33T, u K|\|0w?), or for those who were always curious why the language is this way. And if you like the podcast, subscribe to my Twitter Feed! http://www.twitter.com/fguime Beer of the Episode: Leinenkugel's Sunset Wheat
It's THE END OF SUMMER! If you like what you hear, DEFINITIVELY, treat me a beer ! :) (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4
Tweet, Tweet!(https://twitter.com/#!/fguime) Scopeshttp://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html Override annotationhttp://stackoverflow.com/questions/94361/when-do-you-use-javas-override-annotation-and-why Abstract Methods and Classeshttp://docs.oracle.com/javase/tutorial/java/IandI/abstract.html Vote for us in iTunes(http://itunes.apple.com/us/podcast/java-pub-house/id467641329) Questions, feedback or comments! comments@javapubhouse.com Subscribe to our podcast! (http://javapubhouse.libsyn.com/rss) Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4 |
Sun, 24 June 2012
As developers, we have to deal with Exceptions every day (or at least every other day). In this episode we dive a bit on exception (and exception handling), plus we talk about certain behaviors that are not so well-understood (try returning from a finally block, or why exception stack traces sometimes misteriously disappears). A good review for those who already know, and a great primer for those diving into Exceptions, this episode is sure to show some surprises! (~)P (~)P (~)P (~)P (~)P (Beer) (~)P (~)P (~)P (~)P It's SUMMER! If you like what you hear, DEFINITIVELY, treat me a beer ! :) (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4 (~)P (~)P (~)P (~)P (~)P (Beer) (~)P (~)P (~)P (~)P
Tweet, Tweet! (https://twitter.com/#!/fguime) Try-with-resources constructhttp://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html Exception Definitionhttp://docs.oracle.com/javase/tutorial/essential/exceptions/definition.html Checked vs Unchecked Exceptions Debatehttp://www.ibm.com/developerworks/java/library/j-jtp05254/index.html More Exception Debates from C vs C++, still a useful read. http://www.250bpm.com/blog:4 Vote for us in iTunes(http://itunes.apple.com/us/podcast/java-pub-house/id467641329) Questions, feedback or comments! comments@javapubhouse.com Subscribe to our podcast! (http://javapubhouse.libsyn.com/rss) Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4 |
Wed, 6 June 2012
Episode 25. Reflection and vampire classes, and compiling Java from within Java. We have heard the word "Reflection" thrown around, what does it mean? it is a new Twilight series? is it about Vampires? In all, we shed sunlight into what reflection is (and more importantly why in the world you want to use it). And also cover a technique to compile and load programs within your program. Javascript guys had access to this by doing eval("your program here"), and while Java doesn't have an eval function, there are ways of achieving similar results (and very specific reasons to do this crazy technique. Mostly performance)
It's SUMMER! If you like what you hear, DEFINITIVELY, treat me a beer ! :) (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4
Nimbus code to get the dang CacheMode (considered a private variable)
public class ButtonPainter extends AbstractRegionPainter {
public ButtonPainter() {
Class<?> c = null;
PaintContext ctx = new PaintContext(new Insets(0,0,0,0), new Dimension(100,100), false, null, Double.POSITIVE_INFINITY, 2.0 );
try {
c = Class.forName("javax.swing.plaf.nimbus.AbstractRegionPainter$PaintContext$CacheMode");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
if (c != null) {
Object cacheMode = c.getEnumConstants()[2]; // NINE_SQUARE_SCALE
for (Field field : ctx.getClass().getDeclaredFields()) {
if (c.getName().equals(field.getType().getName())) { // if Field is the CacheMode
try {
// the following lines would not be necessary for example if
// AbstractRegionPainter.cacheMode were protected or public.
field.setAccessible(true); // make it accessible so that we can set it
field.set(ctx, cacheMode); // set the cachemode
// this is equivalent as sayin "ctx.cacheMode = CacheMode.NINE_SQUARE_SCALE" if it were public/protected
break;
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
}
}
@Override
protected PaintContext getPaintContext() {
return null; //To change body of implemented methods use File | Settings | File Templates.
}
@Override
protected void doPaint(Graphics2D g, JComponent c, int width, int height, Object[] extendedCacheKeys) {
//To change body of implemented methods use File | Settings | File Templates.
}
}
Code to get instance from a source file public static Object getInstanceForSource(String className, String sourceForRule) {
String filename = "tmp/" + className + ".java";
File file = new File(filename);
writeFile(filename, sourceForRule);
String classPath = System.getProperty("java.class.path");
String[] args = new String[]{
"-classpath", classPath,
filename
};
StringWriter compilerOutput = new StringWriter();
int status = com.sun.tools.javac.Main.compile(args,new PrintWriter(compilerOutput));
additionalInfo.value = compilerOutput.toString();
switch (status) {
case 0: // OK
// Make the class file temporary as well
File classFile = new File("./tmp/");
try {
// Try to access the class and run its main method
URLClassLoader loader = new URLClassLoader(new URL[] {classFile.toURI().toURL()});
Class clazz = loader.loadClass(className);
return clazz.newInstance();
} catch (Exception ex) {
additionalInfo.value = "Exception in main: " + Utilities.exceptionToString(ex)+"\n"+additionalInfo.value;
}
break;
case 1:
System.out.println ("Status: Error" +"\n"+additionalInfo.value);
break;
case 2:
System.out.println ("Status: CMDERR" +"\n"+additionalInfo.value);
break;
case 3:
System.out.println ("Status: SYSERR" +"\n"+additionalInfo.value);
break;
case 4:
System.out.println ("Status: ABNORMAL" +"\n"+additionalInfo.value);
break;
default:
System.out.println ("Status: UNKNOWN" +"\n"+additionalInfo.value);
break;
}
return null;
}
public static void writeFile(String fileName, String content) {
Writer writer;
File file = new File(fileName);
try {
writer = new BufferedWriter(new FileWriter(file));
writer.write(content);
writer.close();
} catch (IOException e) {
System.out.println ("I/O exception "+e);
}
}
Tweet, Tweet!(https://twitter.com/#!/fguime) Reflection 'trail' http://docs.oracle.com/javase/tutorial/reflect/index.html Vote for us in iTunes(http://itunes.apple.com/us/podcast/java-pub-house/id467641329) Questions, feedback or comments! comments@javapubhouse.com Subscribe to our podcast! (http://javapubhouse.libsyn.com/rss) Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4 |
Thu, 8 March 2012
In this podcast we turn and talk of that embarassing uncle that every API has (java.util.date), you know, the one that you have to live with because is family, but don't really like that much? We dive into what to avoid when using Date (and Calendar), and the most common pitfalls that we have falled for (1000*60*60*24 anyone?). In all, if you have used date extensively you probably already migrated to JodaTime, but if you are a casual user, then take a listen, just to make sure you are not bitten by the Date traps! Vote for us in iTunes (http://itunes.apple.com/us/podcast/java-pub-house/id467641329) http://joda-time.sourceforge.net/ (Joda Time) Questions, feedback or comments! comments@javapubhouse.com Subscribe to our podcast! (http://javapubhouse.libsyn.com/rss) |
Thu, 1 March 2012
We finish our discussion on the ObjectOutputStream by covering the SerialVersionUID, and then move onto ObjectOutputStream's citadine cousin, XMLEncoder and Decoder (and why would you go and hang out with it). We also make a quick introduction to "The Bean" (Java Beans that is), and discover there isn't too much to it. If you are persisting and/or transmitting, listen to the shocking conclusion (gasp!) of serialization! Rate us in iTunes (http://itunes.apple.com/us/podcast/java-pub-house/id467641329) http://java.sun.com/developer/technicalArticles/Programming/serialization/ (Serialization/Deserialization) Questions, feedback or comments! comments@javapubhouse.com Subscribe to our podcast! (http://javapubhouse.libsyn.com/rss) |
Thu, 16 February 2012
We all have the need to serialize/deserialize objects (either through the "wire" or to file). In this podcast we go and analyze what exactly happens when we create an ObjectOutputStream and write to it, and more importantly what pitfalls are there to avoid (Out ot memory errors, stale object updates, Not Serializable Exceptions, and toenail fungus!). If you ever considered using ObjectOutput/InputStream, or are actively using in your current projects, take a listen! https://github.com/eishay/jvm-serializers/wiki/ (Serialization performance comparison for Java, pick one!) Questions, feedback or comments! comments@javapubhouse.com Subscribe to our podcast! (http://javapubhouse.libsyn.com/rss) |
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