Programming Principles: The Java Library

In this session we point you at the Java Library, and go into some more details on how Strings work. We also introduce the HashMap class (a very useful type of collection).

Una biblioteca de clases en Java para simulación y apoyo al estudio de sistemas de control.

Resumen tomado de la publicación

Java path setting batch file

This is a batch file written to help students on ECS' Programming 1 course (COMP1202) using iSolutions machines which have the JDK, but do not add it to the PATH variable, making compilation from the command line difficult. It attempts to find the JDK directory and add it to the Windows PATH. The code is as follows: @SET JAVA_HOME=C:\Program Files\Java @FOR /F %%G IN ('DIR /B "%JAVA_HOME%\JDK*"') DO @SET JDK_HOME=%JAVA_HOME%\%%G @SET PATH=%JDK_HOME%\bin;%PATH% @javac -version @echo. @echo %JDK_HOME%\bin successfully added to Windows PATH @echo. @echo Now type 'javac'. @echo. @echo. @echo. @CMD

Educación interactiva y Java.

El lenguaje Java, implementado a través de 'applets', son las herramientas naturales para elaborar contenidos interactivos, independientes de plataforma y accesibles por internet. Nuestra aportación consiste en la presentación de ejemplos de 'applets' creados en torno a los contenidos de tres asignaturas de la ESO. Introducen el proyecto para escribir con el mismo formato, para las asignaturas de mecánica de la carrera de Ciencias Físicas.

Ten compte, guinyol, que el dimoni est?? a la mira! : canvi, tradici?? i educacio. 'Ten cuidado, gui??ol, que el demonio est?? atento : cambio, tradici??n y educaci??n'

Resumen del autor en catal??n

Les pelúlícules : del guió a la pantalla. 'Las películas : del guión a la pantalla'.

Esta actividad pretende enseñar al alumnado a hacer crítica y valoración de las películas, sensibilizar a los niños y niñas delante de las imágenes cinematográficas y en la selección de sus programas, y hacer comprensibles los conceptos y mecanismos de producción y distribución de las películas.

Les pel.lícules : del guió a la pantalla. 'Las películas : del guión a la pantalla'.

La presentación de la actividad permite establecer un diálogo con los alumnos para valorar el nivel de conocimiento sobre el tema. Un primer ejercicio consistirá en mostrar carteles, fotografías de películas que no han visto nunca y hacerles escoger una para ver como está anunciada y analizar porqué la han escogido. Seguidamente se analizara quién es quién en los títulos de crédito: producción, distribución...Se proponen como objetivos de esta actividad: Sensibilizar a los niños y niñas delante las imágenes cinematográficas y Aprender a hacer críticas y valoración de las películas.

La interacción con applets Java para el aprendizaje de las matemáticas.

Resumen tomado de la publicación

La Ingeniería Lingüística con Java.

Resumen basado en el de la publicación

Los microciberjuegos y el aprendizaje de las Ciencias Sociales : el mundo java.

Resumen tomado de la publicación

MPJ express: Towards thread safe Java HPC

MPJ Express is a thread-safe Java messaging library that provides a full implementation of the mpiJava 1.2 API specification. This specification defines a MPI-like bindings for the Java language. We have implemented two communication devices as part of our library, the first, called niodev is based on the Java New I/O package and the second, called mxdev is based on the Myrinet eXpress library MPJ Express comes with an experimental runtitne, which allows portable bootstrapping of Java Virtual Machines across a cluster or network of computers. In this paper we describe the implementation of MPJ Express. Also, we present a performance comparison against various other C and Java messaging systems. A beta version of MPJ Express was released in September 2005.

Parallel and distributed computing with Java

The Java language first came to public attention in 1995. Within a year, it was being speculated that Java may be a good language for parallel and distributed computing. Its core features, including being objected oriented and platform independence, as well as having built-in network support and threads, has encouraged this view. Today, Java is being used in almost every type of computer-based system, ranging from sensor networks to high performance computing platforms, and from enterprise applications through to complex research-based.simulations. In this paper the key features that make Java a good language for parallel and distributed computing are first discussed. Two Java-based middleware systems, namely MPJ Express, an MPI-like Java messaging system, and Tycho, a wide-area asynchronous messaging framework with an integrated virtual registry are then discussed. The paper concludes by highlighting the advantages of using Java as middleware to support distributed applications.

MPJ express meets gadget: towards a java code for cosmological simulations

Gadget-2 is a massively parallel structure formation code for cosmological simulations. In this paper, we present a Java version of Gadget-2. We evaluated the performance of the Java version by running colliding galaxies simulation and found that it can achieve around 70% of C Gadget-2's performance.

A buffering layer to support derived types and proprietary networks for Java HPC

MPJ Express is our implementation of MPI-like bindings for Java. In this paper we discuss our intermediate buffering layer that makes use of the so-called direct byte buffers introduced in the Java New I/O package. The purpose of this layer is to support the implementation of derived datatypes. MPJ Express is the first Java messaging library that implements this feature using pure Java. In addition, this buffering layer allows efficient implementation of communication devices based on proprietary networks such as Myrinet. In this paper we evaluate the performance of our buffering layer and demonstrate the usefulness of direct byte buffers. Also, we evaluate the performance of MPJ Express against other messaging systems using Myrinet and show that our buffering layer has made it possible to avoid the overheads suffered by other Java systems such as mpiJava that relies on the Java Native Interface.