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Three images to understand immutability of String in Java
String is immutable in Java. This means once a String object is created and instantiated, that object cannot be changed. Any operation on the String object will create a new Object instead of operating on the original content. Below are three images to help you understand String immutability in Java. Declare a String String s = "abcd"; s stores the reference to the string content created in the heap. Assign the String reference to another String variable String s2 = s; s2 stores the same ...
Workaround size limit of phpMyAdmin import sql file
When doing website development with MySQL, we often need to do database backup and restore. For website, the data in database will grow quickly, so when we back up the database, the size of the generated sql file may be over 80MB which is the max allowed size when we want to import a sql file for restoring our database using phpMyAdmin. To workaround this limit, we need to review the documentation of phpMyAdmin. Fortunately, I found an online article written by David Pratt which gave us a ...
MySQL,phpMySQLAdmin,80M,import,solution,limit 2014-08-14 09:59:27
Using keytool to create certificate chain
JDK provides a command line tool -- keytool to handle key and certificate generation. This tool has a set of options which can be used to generate keys, create certificates, import keys, install certificate and export certificates etc. In this tutorial, we will show how to create certificate chain using keytool. If you want to understand how to create certificate chain programmably, please refer to Generate certificate in Java -- Certificate chain. To begin, we first generate a key pair whi...
JAVA,KEYTOOL,CERTIFICATE CHAIN,CERTIFICATE 2015-12-17 07:09:33
A trap about PHP random number
The method to get random number in PHP is very simple, we only need to use rand() function. int rand ( int $min , int $max ) One function call can return the random number in a specified range. But in fact, the random number in computer is actually pseudorandomness, generally to increase the randomness, we may set a random seed before calling rand(). void srand ([ int $seed ] ) According to other language features, we should pass a time value as a parameter to the srand() function, generally...
Android create button tutorial
This tutorial assumes that you already have an activity and are using an XML layout. Open the layout XML and add the button element. Assign an ID with the “@+id” operator. The + tells Android to generate an ID for this element so that you can reference it in your Java files. This is an example. Your layout and text elements will probably be very different. In this example case, the ID of the button is “close”. <Button android:id="@+id/close" android:lay...
Use progressive JPEG to improve user experience
JPEG image files can have two different save types : Baseline JPEG and Progressive JPEG. Both of them have the same extension name but with different display effect. Baseline JPEG This type of JPEG files are scanned from top to bottom consecutively, each line of the image data will be saved sequentially. When opening this kind of images, data will be displayed with the save order line by line until all the data are read. If the image size is very large or network speed is very slow, the image wi...
USER EXPERIENCE,PROGRESSIVE JPEG,BASELINE JPEG 2013-07-25 08:11:50
Google’s BERT - What changed and what didn’t
Most of us should already be aware that Google has updated their algorithm. The new algorithm is called BERT (Bidirectional Encoder Representations from Transformers) and has made at least a couple of modern-day SEO experts scratching their heads trying to figure out what it means. The good news is that there have been no major changes enough to make SEO experts change their strategies drastically. This means that all of the linking and keyword researching techniques remain the same and w...
GOOGLE UPDATE,BERT,GOOGLE ALGORITHM,GOOGLE SEARCH 2019-10-30 05:35:05
ASP.NET 4 Breaking Changes #1: requestValidationMode cause ValidateRequest=False to fail
The request validation feature in ASP.NET provides a certain level of default protection against cross-site scripting (XSS) attacks. In previous versions of ASP.NET, request validation was enabled by default. However, it applied only to ASP.NET pages (.aspx files and their class files) and only when those pages were executing.In ASP.NET 4, by default, request validation is enabled for all requests, because it is enabled before the BeginRequest phase of an HTTP request. As a result, request valid...
ASP.NET,Html content,Error,ValidateRequest,requestValidationMode 2011-11-07 13:50:29
18 Good Web and Mobile Development Frameworks
iWebKitjQTouchjQuery MobileSencha TouchWijmo – jQuery UI WidgetsThe-M-Project – HTML5 Javascript FrameworkTreesaver.js – Framework for Creating Magazine-Style LayoutsjQuery Form Framework – jFormerNot Just A Grid – Flexible and Modular CSS FrameworkZepto.js – Minimalist JavaScript Framework for MobileGalleria – JavaScript Image Gallery FrameworkGury – HTML5 Canvas Utility LibraryAmplifyMobl – Open-Source HTML5-Based LanguageSproutCor...
Read white space with scanf()
Usually, when we want to enter string with white spaces in C, we need to call gets() or fgets(0 method. We usually will not use scanf(0 or fscanf() because they cannot accept white spaces when scan user inputs. But when we specify the format in scanf() function, we may read strings with white space. the code section below illustrate this: #include <stdio.h> int main(int argc,char **argv){ char name[30]; fprintf(stdout,"Please en...
C,scanf,white space, string format 2011-09-26 11:45:43
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