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  Comparable and comparator in Java

Comparable and comparator are two similar interfaces used to compare objects in Java. When we want to sort a list of objects such as Employee or User etc, we may need to implement these interfaces to make them comparable as we want. However, there are some differences between comparable and comparator interface.ComparableA comparable object is capable of comparing itself with another object. The class itself must implements the java.lang.Comparable interface in order to be able to compare its in...

   Java,Comparable,Comparator,Sort     2012-07-04 12:06:15

  Integer overflow

You may be familiar with integer overflow, but what you may not be familiar with is how gcc handles signed integer overflow. First let's look at the standard, for unsigned integer, the standard says : A computation involving unsigned operands can never overflow, because a result that cannot be represented by the resulting unsigned integer type is reduced modulo the number that is one greater than the largest value that can be represented by the resulting type. In other words, unsigned integer ov...

   Integer overflow,gcc,Linux     2012-10-20 13:33:10

  Why is my IP blocked at a website I visit regularly after I changed ISPs?

I just installed a new Express Card with Verizon Broadband wireless last night. Had tons of fun accessing the web from places I usually cannot, (we are in trucking) until I got to my favorite forum. It's a public place I have been to thousands of times, but instead of happily browsing all the daily news events and checking to see if the world blew up yet, I found myself blocked by a big white screen that said YOUR IP ADDRESS HAS BEEN BANNED. What can I do? I can't go to the forum owners to ...

   ISP,IP Block,StopForumSpam,Solution     2012-02-01 08:53:38

  Database Testing – Practical Tips and Insight on How to Test Database

Database is one of the inevitable parts of a software application these days. It does not matter at all whether it is web or desktop, client server or peer to peer, enterprise or individual business, database is working at backend. Similarly, whether it is healthcare of finance, leasing or retail, mailing application or controlling spaceship, behind the scene a database is always in action. Moreover, as the complexity of application increases the need of stronger and secure database emerge...

   Database,Tips,Practice     2011-06-29 08:47:40

  How multitasking really works on Android and iOS

As the horsepower packed into mobile devices gets ever greater, more full-featured forms of multitasking are possible. The market leaders have very different ways of going about things, and there are numerous misconceptions about what is going on behind the scenes. This isn’t all the fault of the user, though. In the interest of ease of use, sometimes the multitasking metaphor is overly simplified on both Android and iOS. iOS: It’s more complicated than it looksEver since iOS...

   Android,iOs,Multitasking,Task bar     2012-01-06 09:58:09

  Python Patterns - An Optimization Anecdote

The other day, a friend asked me a seemingly simple question: what's the best way to convert a list of integers into a string, presuming that the integers are ASCII values. For instance, the list [97, 98, 99] should be converted to the string 'abc'. Let's assume we want to write a function to do this. The first version I came up with was totally straightforward: def f1(list): string = "" for item in list: string = string + chr(item) return string ...

   Python,Optimization,Anecdote,Loopup,ASCII     2011-12-18 10:52:49

  JavaScript to open link in new window without being popup blocked

To ensure security and reduce spamming, modern browsers have implemented very strict rules on when a new window can be opened in a web page. Currently browsers restrict that any new web page to be opened in a new window must be initiated with an user action. The action is usually an user click event. Otherwise, a popup blocker would show on the browser address bar which indicates that something is blocked. To workaround this issue, normally you should implement the window open logic in a click e...

   JAVASCRIPT,IFRAME,NEW WINDOW,OPEN LINK     2018-09-22 04:29:30

  How does CSDN dare to use plain text as password?

Recently, the China's largest Chinese IT community website named CSDN leaked its user's account information. Later today CSDN made an announcements to its users on their website. The announcement said that some user account information was leaked and the passwords of the accounts were stored as plain text in their database before 2009, and after 2009, they adopted an encryption algorithm to encrypt user password. They urged all users who registered the account before 2009 to change their passwor...

   Security,Information leak,CSDN,Plain text     2011-12-22 09:10:01

  How to Find User Participants To Test Your Project

Image Source: Unsplash Recruiting the right participants is important to test your projects properly, but it's essential that your research participants are able to represent your target group, or the results won't translate into something you can use. Since recruiting for specific criteria can be time-consuming, follow these considerations that should make getting these types of user participants easier.  Sharply Define Recruitment Topic Criteria There needs to be a required criteria befo...

   USER RESEARCH,USER REQUIREMENT,TESTING     2020-08-26 07:53:28

  + operation on JavaScript objects

In JavaScript, there are two types of values: primitive and object. Primitives consist undefined, null, boolean, number and string. Other values such as array and function are objects. When applying + operation on different type of values, there would be three kinds of type conversion. Primitive conversion Number conversion String conversion There three type conversions have corresponding abstract operations in JavaScript: ToPrimitive(), ToNumber(), ToString(). For number additi...

   JAVASCRIPT,PROGRAMMING     2018-10-12 22:19:12

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