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Memory related exception analysis in Java
Java Virtual Machine Specification divides the memory of JVM into several areas : Heap, Stack, The Program Counter register and Method area etc. In HotSpot JVM, heap is composed of Young, Tenured and Perm. There are different OutOfMemory error can happen in different memory area. Next is an overview of some of these OOM errors. StackOverflowError The JVM will allow only a specified number of stacks created nested. An JVM option -Xss can be set to determine the maximum stack size. If the num...
Java, Memory model, Memory exception, OOM 2015-01-19 06:54:27
Use cases of Java enumeration
JDK 1.5 introduces a new type -- enumeration. In Java, it's just a small feature, but it can bring us much convenience.Here we summarize some use cases of Java enumeration. 1. Constant Prior to JDK 1.5, we can define constant as public static final..., now we can use enumeration to group all constants in one enum variable and it also provides some useful functions. public enum Color { RED, GREEN, BLANK, YELLOW } 2.In Swit...
Java, Enum,enumeration 2013-01-05 09:15:30
JSP connect MySQL
To connect MySQL with Java Server Page(JSP). Some steps should be followed:Step 1: Download MySQL JDBC connector driver from the Internet. URL: http://dev.mysql.com/downloads/connector/j/Step 2: Put the jar file downloaded in Step 1 in the Tomcat common lib folder and add this jar file to the CLASSPATH so that the JSP page can find the specified class.Step 3: Create the JSP page with MySQL connection : Example is shown below: <% String driver="com.mysql.j...
MySQL,JSP,Connection,Driver,Download 2011-05-11 10:04:57
Advantages Associated with Semantic SEO Searches
Today, all businesses are aware of the fact that SEO is an integral part of their online endeavors. However, some of them do not really know or understand the way SEO works and how things are changing in the SEO landscape. Do you have any idea about some positive effects of SEO and how this specific shift has affected the way people search online and exactly how search results would be ranked? SEO has been there for decades now. However, only since the year 2000 onwards, Google has proactively ...
ALGORITHM,SEO,SEMANTIC SEO,ADVANTAGEST,HUMMINGBIRD 2018-08-14 01:02:16
jQuery to check whether checkbox is checked
In Vanilla JavaScript, the correct way of checking whether a checkbox is checked is to get the property checked of the checkbox. Assuming there is an checkbox with id "checkbox1", below line will return true if the checkbox is checked while it will return false if the checkbox is unchecked: document.getElementById("checkbox1").checked In jQuery, there are a few ways to check this. The first one is to using the corresponding counterpart of the Vanilla JavaScript, it is to check the checked proper...
noConflict mechanism in jQuery
Many JavaScript frameworks like to use $ as function or variable name, jQuery is one of them. In jQuery, $ is just a reference to window.jQuery, so even if $ is deleted, window.jQuery will still be available to ensure the whole library can work normally. jQuery API design takes fully consideration of multiple frameworks conflicts, we can use jQuery.noConflict function to easily handle control. jQuery.noConflict accepts one optional boolean parameter[1] to determine whether to hand jQuery object ...
jQuery,noConflict,$ 2013-03-14 19:40:36
The danger of target=_blank and opener
When want to open a new page in a new tab on clicking a link on a page, the usual way of achieving this is to use target="_blank" property in a tag. However, the use of this leaves space for phishing website. Background parent and opener Before talking about the opener object, let's know a bit about parent object when using iframe. HTML provides a parent object which is used to communicate between the parent page and the embedded iframe element. This parent object can be accessed using...
HTML,TARGET BLANK,REL NOOPENER,REL NOREFERRER 2018-09-15 04:53:56
PHP to output string to client terminal
It is a common task to echo messages to the user using PHP. There are lots of ways where the message can be echoed to the client terminal(browser or console window) through PHP. These includes some well know debug methods like var_dump() and var_export() etc. In this post, we will show you some other methods shared by Laruence, one of the core members of PHP development team. 1. echo First comes with the most common one : echo. $str = "Hello PHP\n"; echo $str; 2. print Then comes another c...
Understanding GoLang interface
If goroutine and channel are considered as the foundation for GoLang concurrency, interface would be the key for data types in GoLang. In practical Go programming, almost all data types are built/used around interfaces, interface is the core of GoLang data structures. Go is not a typical OOP language, it has no class and inheritance concept syntactically. But it doesn't mean that there cannot be polymorphism in GoLang. Because of interface, it achieves the same polymorphism effect as in C++, tho...
JavaScript tutorial - Creating time delays
There are two ways of creating time delays with JavaScript. The first is more simple and will simply wait for a specified amount of time before executing a function. The second does the same but will repeatedly execute the function. Note, many browsers have a minimum delay length of between 25 and 75 ms, with some of the fastest browsers having a minimum delay of about 3 ms. If a shorter delay is specified, the actual delay will be the minimum delay length. Even with higher numbers, the delay i...
JavaScript,Time delay,setTimeout,setInterval 2012-04-13 07:17:46
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