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原创 java wildcards examples

Specifying upper bound with extends // drawAll() can draw a list of shapes as well as a list of subtype of // shapes public static void drawAll(Collection shapes) { for (Shape

2013-05-14 13:26:35 576

原创 Sort

Selection sort: int i, j; for( i = 0;i < size - 1; i++ ) { int minValIndex = i; for( j = i; j < size; j++ ) { if( constianer[minValIndex].value

2012-12-14 00:47:39 395

原创 C++ static variable initialization

Because static member variables are not part of the individual objects, you must explicitly define the static member.If you fail to initialize the static variable,Undefined Reference to staticVal

2012-10-15 04:07:52 828

原创 Saxon PE usage

To be honest, saxon PE documentation is super confusing. All I know is just a simple usage from Saxon PEBasic usage: java -cp saxon9pe.jar net.sf.saxon.Transform -s:${source} -xsl:${xslt file

2012-10-12 07:12:44 546 1

原创 Java Reading XML using DOM parser

Document, Element and Attr Interface ALL extend from Node Interface.The Document interface represents the entire HTML or XML document. Conceptually, it is the root of the document tree, and provides

2012-10-03 09:02:11 530

原创 Tomcat MVC example - FindCat

This program is developed in Tomcat7 Eclipse EEprogram purpose: Find the cat by its nameindex.html - has a input box that requires the name of the catInsert title hereCat name:

2012-10-02 10:25:19 540

原创 Javascript Array

ReferenceFor...inFor...in loop does not guarantee to keep the original order of the array, Use traditional for loop instead.Deletearray.splice(index,howmany,item1,.....,itemX)index: th

2012-08-24 06:51:41 376

原创 C linkedList

One Way Linked List/* * File: OneWayList.c * Author: xinghuazhang * * Created on March 22, 2012, 9:41 PM */#include #include #include #include /* one way linked list*/struct Node{

2012-08-20 07:40:13 2098

原创 XSLT(19) document() Function to access external xml

node-set document(object,node-set?)object Required. Defines an URI to an external XML documentnode-set Optional. Used to resolve relative URIExample:NOTE: WHEN use this funct

2012-08-18 09:58:05 1890

原创 Graph

graphgraph is an abstract data type that is meant to implement the graph and hypergraph concepts from mathematics.EdgeAn edge represents a connection between nodes. Edges can be either directe

2012-08-18 01:04:38 448

原创 Tree structure

treea tree is a widely used data structure that simulates a hierarchical tree structure with a set of linked nodes. Tree is a subset of graphnodeA node is a structure which may contain a value o

2012-08-18 00:55:55 652

原创 BinarySearch

Type: logarithmic algorithmPerformance: O(log N)Worse case: logN + 1Requirement - a is already sortedreturn index of the key from the array or -1 if not found public static int binaryS

2012-08-17 01:42:53 334

原创 Javascript Pattern Module pattern

The Module pattern encapsulates "privacy", state and organization using closures. It provides a way of wrapping a mix of public and private methods and variables, protecting pieces from leaking into

2012-08-13 12:03:45 350

原创 Javascript Closure

Simple example of closure:function sayHello(name) { var text = 'Hello ' + name; // local variable var sayAlert = function() { console.log(text); } return sayAlert;}var say = sayHello( "fef

2012-08-13 10:23:56 378

原创 Javascript OOP augmenting with prototype

prototype referenceAllows the addition of properties to all objects of type Object.we can extend the functionality of build-in types:// Add a method conditionally.Function.prototype.meth

2012-08-13 04:35:37 339

The throw statement interrupts execution of the function. It should be given an exception object containing a name property that identifies the type of the exception, and a descriptive message propert

2012-08-13 03:23:47 510

原创 Javascript call and apply

Function.prototype.applyCalls a function with a given this value and arguments provided as an array.syntax:fun.apply(thisArg[, argsArray]).thisArgThe value of this provided for the call

2012-08-13 03:12:56 450

原创 Javascript Function

Functions are link to Function.prototype. Function.prototype is linked to Object.prototype.Since functions are object, they can have property, method, they can be passed to functions.The missing p

2012-08-13 02:33:10 374

原创 Dynamically add/remove class via Javascript

get classdocument.getElementById('id').classListdocument.getElementById('id').classNameadd/removedocument.getElementById('id').classList.add('class');document.getElementById('id').cl

2012-08-12 13:11:46 463

原创 Dynamically add/remove elements via JavaScript

Adding Elementsexample: appending an error span to formvar errSpan = document.createElement( "span");errSpan.style.display = "block"; // add styleerrSpan.classList.add( "error"); // add a class

2012-08-12 13:03:41 410

原创 Javascript Avoid global objects

Global objects are accessible through out the program. Wrapping global objects in a object that has the same name as the file name will decrease the number of global variablesmyapp.jsvar myap

2012-08-12 04:41:12 541

原创 Javascript validating form input using RE

Usually checking validity of form input involve regular expression.javascript RE is object it begins with / and ends with /syntax:var patt=/pattern/modifiers;modifiers:g: globali: case-i

2012-08-11 10:22:53 347

原创 Javascript OOP object literal

Everything in Javascript is object. Arrays, functions objects, regular expression are all objects. They are all passed by reference!Object in Javascript looks like HashMap in JavaObject Literal:

2012-08-11 06:22:47 821

原创 Node(25) sharing code between client and server

http://caolanmcmahon.com/posts/writing_for_node_and_the_browser/(function(exports){// your code goes hereexports.test = function(){return 'hello world'};})(typeof exports === 'undefined'

2012-08-11 04:07:30 1382

原创 Node(24) Express Project

make a express project using command promptexpress projectNamecd to the projectnpm installgo to localhost:3000 to see the project

2012-08-10 07:29:48 352

原创 Javascript Debug

Some of the best javascript debug tool is FIrebug in Firefox, developer tools in google chrome.make sure preserlog upon navigation, if not, the log will be disappear.make sure to check if ther

2012-08-09 06:13:53 470

原创 HTML5 - Form validation

validation should be done by Javascript before The form is submitted.JavascriptInput Elements has two most used propertiestype and valueexample : textbox( http://www.w3schools.com/js

2012-08-07 03:03:11 635

原创 Node(23) Express

Express is the most popular Node framework. Use Express to handle get and post are extremely simple.Hello Worldvar app = require('express').createServer();app.get( '/',function( req, res

2012-08-05 22:15:29 532

原创 Node(23) JSON

JSON example profiles.jsmodule.exports = { Peter : { name: 'Peter Parker', age: '18', gender: 'M', grade: 'B' }, Alex : { name: 'Alex Giggersn', age: '23', gender: 'F', grade

2012-08-05 19:59:40 1231

原创 Node(22) Downloading

example with throttlevar http = require( 'http');var fs = require( 'fs');var options = {};options.file = 'pride.txt';options.fileSize = fs.statSync( options.file).size;options.kbps = 32;htt

2012-08-05 08:28:49 806

原创 Node(21) DNS- lookup and resolve

resolve IP address:example from node.js APIvar dns = require('dns');dns.resolve4('www.google.com', function (err, addresses) { if (err) throw err; console.log('addresses: ' + JSON.stringi

2012-08-05 05:51:52 1054

原创 Node(20) File Upload with formidable module

handling file upload needs to include formidable module, writing raw code for file upload is tough.var http = require('http');var formidable = require('formidable');var form = require('fs').r

2012-08-04 23:36:03 714

原创 HTTP

The HTTP protocol enables web servers and browsers to exchange data over the InternetHTTP is connectionless - no connection is ever maintain.HTTP is media independent - any type of file can be s

2012-08-04 08:30:28 741

原创 Node(19) Global Objects

ReferenceA very important global object is process. process represent the current running node program.console is also a global object. console.log is the most common method to print debug c

2012-08-04 05:51:39 1498

原创 Javascript basics - types and variables

Javascript TutorialJavascript Core and HTML DOM ReferenceJavascript XML DOM ReferenceJavaScript OOP:http://phrogz.net/js/classes/OOPinJS.htmlhttp://phrogz.net/js/classes/OOPinJS2.html

2012-08-03 00:35:57 429

原创 CouchDB - Introduction

Reference HTTP APICouchDB: The Definitive GuideNoSQL is a class of database management system identified by its non-adherence to the widely used relational database management system (RDBMS)

2012-08-02 21:13:51 502

原创 Node(18) child_process

child_process has stdin and stdout for input and outputchild_process.exec(command, [options], callback)execute a commanddefault options:var options = { encoding: 'utf8',

2012-08-01 11:17:43 1620

原创 Node(17) Debug

Debug with consoleconsole.log( objects );to see the details of a object use util.inspectutil.inspect(object, [showHidden], [depth], [colors])Debug with EclipseFirst, instal

2012-08-01 10:46:46 804

原创 Node(16) working with couchDB

Apache CouchDB™ is a database that uses JSON for documents, JavaScript for MapReduce queries, and regular HTTP for an API. It is a NoSQL database. It is not a relational database.Node example to

2012-07-31 10:06:25 601

原创 Node(15) vm

vm is similar to eval(), but eval() can change the surrounding context, whereas vm cannotvm is like creating a sandbox, the code will be executed in the different namespace instead of running in the

2012-07-31 00:21:29 655

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