Articles

The Features of Java which help people to build secure applets

Java programs do not use pointers explicitly. Objects are accessed by getting a handle to the object. Effectively, this is like getting a pointer to an object, but Java does not allow the equivalent of pointer arithmetic on object handles. Object handles cannot be modified in any way by the Java applet or application.

C and C++ programmers are used to manipulating pointers to implement strings and to implement arrays. Java has high-level support for both strings and arrays, so programmers don’t need to resort to pointer arithmetic in order to use those data structures.

Arrays are bounds-checked at run-time. Using a negative index causes a run-time exception, and using an index that is larger than the size of the array causes a run-time exception. Once an array object is created, its length never changes.

JAR, WAR & EAR

JAR – Java ARchive
It’s a file format based on the ZIP file format and similar to ZIP format this is also used for aggregating many files (many be of different types) into one aggregate file. This aggregate file will have (.jar) extension. Application development using Java uses JAR files for many useful purposes. One of the most common use is to package all the .class files, image files, and other files required by an Applet into a JAR file, so that the download of a single file will have all the components downloaded at the client machine. Otherwise, we would require those many HTTP Connections to individually download each of the components and this will of course be a very tedious and time-consuming effort. Another popular usage is to bundle all the .class files, and other required component files of a typical subsystem into a JAR file and include that JAR file into the CLASSPATH of another Java application which requires the services of that subsystem. The maintenance and deployment becomes very easier in this case.

Video : Michael Lopp, "A Brief History of Software"

Description :
Michael Lopp (Rands in Repose) "A Brief History of Software"

Video : O'Reilly Webcast: An Introduction to Hadoop

Description :
In this webcast, Cloudera founder Christophe Bisciglia and O'Reilly author Tom White will provide an introduction to Hadoop/MapReduce, the open source project that allows organizations to process, store and analyze massive application datasets.

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