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How to undo git changes?
When using git for version control, there is frequent need on undoing commits due to some unexpected changes. This post will introduce how to undo changes with git command in different cases. Undo commit A common undo case is that some commit needs to be reverted as the commit contains error. In this case, the code is already committed. The command to revert the commit is git revert HEAD This command will add new a commit to the existing head to undo the previous commit. It will not change the p...
GIT,GIT RESET,GIT REVERT,GIT CHECKOUT 2019-12-28 02:21:47
How many programmers does it take to screw in a lightbulb?
There seem to be a lot of “How many programmers does it take to screw in a lightbulb?” jokes floating around the Internet, but none aimed specifically for us SQA folk. I have decided (perhaps mistakenly) that this is no longer acceptable. If this decision is a mistake, I'm sure that someone else in QA will report it up as a bug and assign it to me. For better or worse, there is now an SQA set of these jokes, thanks to me. Now, without further ado, let the pun...
A C++ program puzzle
Recently I came across a question asked by wang2191195 on a Chinese IT forum CSDN which asks about a C++ program puzzle. He has a code snippet which cannot be compiled. The code is:#include <cstdlib> #include <iostream> using namespace std; class Base{ public: virtual void func(){ cout << "Base::func()" << endl; } virtual int func( int num ){ cout << "Base::func( int " << num << " )" << endl; return 0; ...
What does super.clone() do?
Object class has a protected clone() method declared to make it possible for all classes make a clone of itself when needed. The clone() is often used when a new instance of the class is needed while at the same time to maintain the same state as the original object. Any class which wants to have clone enabled has to implement the marker interface Cloneable. If a class which implements Cloneable doesn't override the Object.clone() method, the Object.clone() method will be called to just make a b...
Cloneable,super.clone(),clone,Java 2015-01-07 05:25:52
I'm not good enough to work on open source software
Actually, that's not true - I've produced plenty of open source software over the years. However, in a sense, it is true: only the very best actually get paid to work on open source software full time, and I'm not one of them. People like Linus Torvalds. People like Guido van Rossum, although even he supposedly divides his time, and does not work on Python full-time. Think about that. Python is a hugely popular programming language used by many companies and ind...
Open source,Free,Money,Full-time 2012-04-16 13:27:35
Building Security onto Your Mobile Application
Analysts state that more than 75% of the mobile applications will fail the basic security tests in 2015 – Gartner Research. Enterprises that follow the Bring Your Own Device (BYOD) approach and facilitate mobile computing to their employees are susceptible to security threats and other vulnerabilities, unless they implement stringent security measures. In the development or deployment of mobile applications, a business can be severely impacted both financially and otherwise, if they are to...
Web Application Development Company, iPhone App Development Company 2015-08-21 07:22:32
New Linux kernel fixes power-saving issues
Greg Kroah-Hartman has released long-term kernel 3.0.20 and stable kernel 3.2.5. Both contain just a single bug fix that allows PCIe power-saving technology ASPM (Active State Power Management) to be used on systems with a BIOS that activates ASPM on some components, but states in the FADT (Fixed ACPI Description Table) consulted by Linux that ASPM is not supported. According to Matthew Garrett, who developed the patch, the change can reduce the power consumption of a Thinkpad X220 by 5&nbs...
Linux kernel,Power saving,Fix 2012-02-08 10:10:36
What's Wrong with the For Loop
Closures in Java are a hot topic of late. A few really smart people are drafting a proposal to add closures to a future version of the language. However, the proposed syntax and the linguistic addition are getting a lot of push back from many Java programmers. Today, Elliotte Rusty Harold posted his doubts about the merits of closures in Java. Specifically, he asks "Why Hate the for Loop?": I don’t know what it is some people have against for loops that they’re so eager to...
For loop,Basic,Problem,Efficiency,Java 2012-02-24 05:06:15
Some lovely software design quotes
Every time when I read technical books, I like reading the quote of a famous person at the start of a chapter(if any), usually they are very interesting. Here is a collection of famous quotes. Life’s too short to build something nobody wants – Ash Maurya, Running Lean author Give someone a program, you frustrate them for a day; teach them how to program, you frustrate them for a lifetime. – David Leinweber There are two ways of constructing a software design: One way is...
Quote,Software design 2012-10-13 09:13:34
What kind of automated testing does Facebook do?
We do several kinds of testing. Some specifics:For our PHP code, we have a suite of a few thousand test classes using the PHPUnit framework. They range in complexity from simple true unit tests to large-scale integration tests that hit our production backend services. The PHPUnit tests are run both by developers as part of their workflow and continuously by an automated test runner on dedicated hardware. Our developer tools automatically use code coverage data to run tests that cover the ...
Facebook,Testing,PHP,Automated testing 2012-02-28 08:10:10
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