Friday, May 11, 2012

Tech Review Software Engineering Java: Friday, May 11, 2012

sorting a arraylist in java

working with doubles in java

double const in java




Posted by at No comments:

Tech Review Software Engineering: Thursday, May 10, 2012

Java - TreeMap with Comparator

http://www.java-samples.com/showtutorial.php?tutorialid=371
  • OK example
  • another example
  • RepastEdge<T>
class EdgeCompare implements Comparator
{
   public int compare(Object a, Object b)
   {
      double weightA = (RepastEdge)a.getWeight();
      double weightB = (RepastEdge)b.getWeight();

      int returnVal;

      if (weightA < weightB)
      {
         returnVal = 1;
      }
      else if (weightA == weightB)
      {
         returnVal = 0;
      }
      else
      {
         returnVal = -1;
      }

      return returnVal;
   }
}

TreeSet ts = new TreeSet(new EdgeCompare);

  • negative returned if a < b
  • zero if a == b
  • positive if a > b
List of Java Exceptions

Java - Arrays

Java - List Example
  • interface definition

Java - Class WattsBetaSmallWorldGenerator



Java - Class RepastEdge<T>



Java - for each loop Example
  • for (String city : cities)


Posted by at No comments:

Thursday, November 17, 2011

Tech Review: Wednesday, November 16, 2010

FalconView

FalconView
Where is the FalconView log file?
Xen

  • virtual-machine monitor
  • linux
  • Microsoft Windows
SIMH
  • running VAX/VMS under Linux
VM
  • a completely isolated guest operating system installation within a normal host operating system.

Geospatial


  • Geospatial Data Abstraction Library (GDAL)
  • a library for reading and writing raster geospatial data formats.
  • GML in FalconView
  • OGR has limited support for GML reading and writing
    • Update of existing files not supported
  • GIS (Geographic Information System)

  • GIS Internet Resources
  • Georaphy Markup Language (GML) is a XML grammer defined by the Open Geospatial Consortium (OGC)
FLOSS

What is FLOSS?

ArcGIS


ArcGIS Data Export
Java

The initial value of class member variables.

Android Development

  • use Android-x86 and VirtualBox
Internet Anonymity


  • I2P
  • Make it hard for the site you visit to get you info
Geospatial Platform


  • Government shares with public
  • article about
Linux and Supercomputers

The fastest computer in the world, Japan's K-Supercomputer, runs Linux.

  • 91.4% of the top 500 supercomputers are running Linux
OpenStack


  • opensource software for building private and public clouds
  • consists of 3 parts
    • computer
    • object storage
    • image service
  • private company RackSpace that uses OpenStack

Late Software Projects


  • All software projects are late because they started late
  • The started late for 3 reasons
    1. no one started until the competition proved it doable or desirable
    2. cost a lot more then anyone was willing to pay
    3. no one knew that it needed to be done until the window of opportunity was closing
      • usually a disguise for reason one or two




Posted by at No comments:

Monday, November 14, 2011

Tech Review Notes: Friday, November 11, 2011


Shape Collection Files (Falconview)





C# and FalconView

ViewBook Android
ViewSonic


Repast Simphony Graphics Tutorial


ATSPI

Java Encryption Wizard

Not a self contain application.  I takes the file you drop into it and encrypts them.  You have to have the app and the encrypted file together.  Will not work with a 'headless' Java JRE.

Part of Software Protection Initiative
Download and Instructions

Which Version of Ubuntu am I running?  Which Version of Linux am I Running?

For Ubuntu:

Installing OpenSSH Server


What is BDI? (Belief-Desire-Intention)










Posted by at No comments:

Tech Review: Thursday, November 10, 2011



  • an object-relational mapping (ORM) library for Java
  • provides a object-oriented domain model mapping to a traditional relational database
  • free GNU software
  • http://en.wikipedia.org/wiki/NHibernate
    • NHibernate for MS .NET
  • example program in Java


  • Red Hat Linux
  • Discontinued in 2004
  • Read Hat Enterprise Linux (RHEL)
  • Advance Platform (AS)
  • Red Hat Enterprise Linux 3 (Taroon) Update 9, 2007
    • outside of regular life cycle
    • 2013-10-31 (End of Extended Life Cycle
  • Red Hat Enterprise Linux 6 
    • 2010-11-10
    • 2017-11-30 (End of Regular Life Cycle)



Posted by at No comments:

Wednesday, October 12, 2011

Java Review: Tuesday, October 12, 2011

Java Run-time Exceptions


  • Class IllegalStateException
  • example
    • throw new IllegalStateException();
  • use to catch programming development errors.
  • exception should never occur unless there is a programming error.
  • Class RuntimeException
  • not checked
  • not extra code
  • danger of being a 'lazy programmer'
  • can use to side step catch and specify requirements
  • Runtime exceptions represent problems that are the result of programming problems
  • If the client can reasonable be expected to recover from an exception, make it a checked exception
Garbage Collection in Java VMs


  • Big memory
    • works with
      • JVMs
      • HotSpot
      • IBM JDK
      • JRockit
      • what about Dalvik?
    • off-heap store
      • not subject to Java GC
    • Terracotta's tiered cache
    • Enterprise Ehcache
    • store up to a terabyte in the off-heap
  • Android, designing from performance
  • requesting GC
    • System.gc();
  • no guarantee it will run

Java Constants and Conditional Compile


  • No textual preprocessor
  • constants and conditional compilation
  • use public static final boolean constant for  a regular if statement in regular code
  • Have class using the constant interface implement the constant interface



Posted by at No comments:

Tuesday, October 11, 2011

Tech Review: Monday, October 10, 2011

C# null-coalescing operator



  • From C# Reference for VS 2010
  • example
    • int? x = null;
    • int y = x ?? -1;
    • string s = null;
    • Console.WriteLine (s ?? "Unspecified");
  • used to define a default value for a nullable value type
  • it returns the left-hand operand if it is not null; otherwise it returns the right operand
  • not in Java, but some would like to add the feature
  • more about not in Java
  • coalescing mean "to grow together"
  • does this sound like a good description of what the operator is doing?

Regions in Java


I know the above picture is not about 'Regions in Java' code, but it looked nice.

  • Basically, there are no region pre-compiler directives in Java
  • There is support in some IDEs
    • NetBeans
      • // <editor-fold defaultstate="collapsed" desc="Your Fold Comment">
      • ...
      • // <editor-fold>
    • Eclipse
      • does it automatically for methods, imports, etc.
      • Not declaration like in NetBeans
      • Could you add one?
    • Emacs?
Velocity Android 2.0 Internet Table 7" $100

Velocity Micro T103 Cruz Android 2 Internet Tablet
  • almost what I want
  • missing the camera
  • Multi touch capacitive screen
Viewsonic gTablet 10.1" Android 2.2:  $270
Viewsonic gTablet 10.1" 16GB Internet Tablet
  • This is what I want except the price and Android version


Simple C# Program



  • the main routine starts with a Capital 'M' in C#
  • starts with a lower case 'm' in Java
Listeners and Events (Actions) in Java


  • lesson on writing event listeners
  • action listener
    • public class Beeper ... implements ActionListener {
  • adding an action listener to something
    • button.addActionLisener ( new Beeper() )
  • implement the method that does the action
    • public void actionPerformed (ActionEvent e) {
  • complete Beeper example
Java Color Map


  • color map in java
  • Copyright
    • Carnegie Mellon
    • Sun
    • Mitsubishi
Java List Interface and ArrayList Class



  • Class ArrayList<E>
  • Example
    • List list = Collections.synchronizedList (new ArrayList(...));
Java Collection Interface and Collections Class

  • static void sort (List list)
  • reverse (List list)
Java Queue Interface and PriorityQueue Class



  • new elements are put (enqueued) on the back of the queue
  • element are pulled (dequeued) from the front of the queue
  • First In First Out (FIFO)
  • Interface Queue<E>
  • offer (E o) // enqueue
    • adds an element to the tail of the queue
  • poll () // dequeue
    • returns a removed element from the queue
    • null is empty
  • Class PriorityQueue<E>
  • boolean add (E o)
  • boolean offer (E o)
  • E poll ()
Java Map Interface and HashMap Class

  • Interface Map<K,V>
  • V put (K key, V value)
  • V get (Object key)
  • Class HashMap<K,V>
  • Example:
    • Map m = Collections.synchronizedMap (new HashMap (...));


Chrome Remote Desktop


  • BETA
  • allow users to remotely access another computer through the Chrome browser or Chromebook
  • An add on
  • can easily miss the Icon after installation 















Posted by at No comments:
Subscribe to: Comments (Atom)