Data Structures and Algorithm Analysis. See this page in Romanian The third edition of the textbook is now available! The most recent version is Edition 3.2.0.10, dated March 28, 2013. Note: As of Edition 3.2.0.8 (dated February 7, 2013), all internal cross references (pages in the index, section references in the text, sections in the table of contents, figure references, footnotes, and so on) are hypertexted. Just hover the curser over the appropriate spot on the page and click on it. I maintain both a Java version and a C++ version. Click here for the Java version of Edition 3.2.
The print version is published by Dover Publications. Errata for Edition 3.2. Previous publication history: C.A. Online sourcecode from the Third Edition text is available: Coursenotes for the JAVA version are available. A collection of programming assignments that I have used is available. Note: Sourcecode and course notes from the first and second editions of the text are now obsolete, and I do not support them. Return to Cliff Shaffer's homepage. Add dynamic Java code to your application. JavaServer Pages (JSP) is a more flexible technology than servlets because it can respond to dynamic changes at runtime.
Can you imagine a common Java class that has this dynamic capability too? It would be interesting if you could modify the implementation of a service without redeploying it and update your application on the fly. The article explains how to write dynamic Java code. It discusses runtime source code compilation, class reloading, and the use of the Proxy design pattern to make modifications to a dynamic class transparent to its caller. An example of dynamic Java code Let's start with an example of dynamic Java code that illustrates what true dynamic code means and also provides some context for further discussions. Please find this example's complete source code in Resources. The example is a simple Java application that depends on a service called Postman. Public interface Postman { void deliverMessage(String msg);} public class PostmanImpl implements Postman {
Java Package Tutorial (English version) Introduction Many times when we get a chance to work on a small project, one thing we intend to do is to put all java files into one single directory. It is quick, easy and harmless. However if our small project gets bigger, and the number of files is increasing, putting all these files into the same directory would be a nightmare for us. In java we can avoid this sort of problem by using Packages. Packages are nothing more than the way we organize files into different directories according to their functionality, usability as well as category they should belong to. An obvious example of packaging is the JDK package from SUN (java.xxx.yyy) as shown below: Figure 1. Basically, files in one directory (or package) would have different functionality from those of another directory.
Packaging also help us to avoid class name collision when we use the same class name as that of others. How to create a package Figure 2. That's it!!! Setting up the CLASSPATH set CLASSPATH=. Figure 3. Set CLASSPATH=. Eclipse - The Eclipse Foundation open source community website.
The Coming SQL Collapse. I looked at neo4j briefly the other day, and quite predictably thought ‘wow, this looks like a serious tinkertoy: it‘s basically a bunch of nodes where you just blob your attributes.‘ Worse than that, to wrap objects around it, you have to have them explicitly incorporate their node class, which is ugly, smelly, violates every law of separation of concerns and logical vs. physical models. On the plus side, as I started to look at it more, I realized that it was the perfect way to implement a backend for a bayesian inference engine (more on that later). Why? Because inference doesn‘t care particularly about all the droll requirements that are settled for you by SQL, and there are no real set operations to speak of.
One of the things the status quo defenders of SQL almost always forget is that they have to write themselves a pass to violate the most basic laws of their preferred screed. Here are some of the specific reasons: Understanding Java Card 2.0. This article begins with an overview of smart cards and a brief review of ISO 7816, the smart card standard. Given the background on smart cards in previous Java Developer columns, this installment will begin with an answer to the question, "What is a Java Card?
" and an overview of the Java Card system architecture. Next, we'll focus on the many issues specific to the Java Card, including the Java Card lifecycle; the Java Card 2.0 language subset and API library classes; and Java Card security. Then we'll discuss the Java Card runtime environment and show how a Java Card runs. From here on, all references to Java Card implicitly refer to the Java Card 2.0. What is a smart card? Identical to the size of a credit card, a smart card stores and processes information through the electronic circuits embedded in silicon in the plastic substrate of its body.
ISO 7816 part 1-7, defined by International Standard Organization, contains a set of standards that covers various aspects of smart cards.