Open Closed Principle Java

In the past, we have introduced some principles of software development, such as the 10 commandments of high quality code and the UNIX design principles described in the UNIX legend (next article). I believe that you can learn from middle school some knowledge of design principles, as I said in the "How Do I Recruit procedures", a good programmer usually consists of its operational skills, knowledge level, experience level and ability four aspects. Here I would like to talk about some of the principles of design, I think these things belong to the long-term experience summed up knowledge. These principles should be understood by every programmer. But...

This article is my second time reading Hadoop 0.20.2 notes, encountered many problems in the reading process, and ultimately through a variety of ways to solve most of the. 　　Hadoop the whole system is well designed, the source code is worth learning distributed students read, will be all notes one by one post, hope to facilitate reading Hadoop source code, less detours. 1 serialization core Technology The objectwritable in 0.20.2 version Hadoop supports the following types of data format serialization: Data type examples say ...

To use Hadoop, data consolidation is critical and hbase is widely used. In general, you need to transfer data from existing types of databases or data files to HBase for different scenario patterns. The common approach is to use the Put method in the HBase API, to use the HBase Bulk Load tool, and to use a custom mapreduce job. The book "HBase Administration Cookbook" has a detailed description of these three ways, by Imp ...

In the heyday of Java Hadoop, open source cloud computing has a black-sector/sphere based on C + +, which challenges Hadoop in terms of performance, open Cloud Consortium (OCC) opened the Cloud Computing Association Cloud testbed Open Cloud experimental bed software test, sector is about twice as fast as Hadoop. This article first on this black horse to do a combat exercise ...

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Lobby text | Yang Ying Wang special writing Hu Yun drawing | litingting Good design has the power to attract people's hearts. You'll find that even seemingly good designs can make people pay a premium. But a really good design, with a unique perspective and wisdom to constantly revise the various loopholes in life, to provide aesthetic beauty, of course, can also help the company shape the brand. Designer Mitch Kaupol in the 1990 edition of the "Software Design Manifesto", said: "Designers ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technical Hall because I read is the vocational school, 05 to enter the university, the study computer (3+2,3 Year 2 years University) to now is 4 years, has already read 1 years University! In reading slowly find the direction of learning, began to study the site! Just started because the school is better for me! Let me help a company to do an internal system, and later for some reason things did not come out! But I have been more interested in the site! Later, because of more contact on the forum to interest, the number of registered forum to reach 200 ...

Intermediary trading http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnosis Taobao Cloud host Technology Hall I name: Trinidad Lone Wolf, hereinafter referred to as Wolves, I hope not to give you reader caused confusion oh. Review Wolf learning PHP experience, filled with emotion. I was in 2004 began to contact the PHP, at that time because the Tangshan can not buy a PHP book, so please Beijing friends, spent more than 70 yuan to buy a ...

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Hall search engine history notes #e# 2006 Low, received a friend commissioned to help tidy up the development of the search engine history, so the Spring Festival spent a little time to sort out a rough history. Consider yourself a little note about internet history. 1, the development history of the search engine 1 A brief history of search history The origin of the "Aceh" web search engine can be traced back to 1991 years. The first ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host Technology Hall Editor's note: Zhang Chunhui (Sunnycheung), net name "spider/Rock sugar Chestnut", one of the early Chinese Internet builders, China's first internet station "Shenzhen window" and the first BBS station "A network love Deep" founder. When active in a net sentiment deep netizen such as Ding Lei, Zeng Liqing and so on, now already became the man of the Internet. 　　So Zhang Chunhui and a net love those people, those things, also become the 30 it process indelible imprint. 1996 4 ...

China million network domain name online free transfer function will be on-line today. 　　Users need to apply for this function online, million network audit after the opening of its free transfer rights, users can then submit online transfer, no longer need to pass the information to the million network every time. 　　This function is only open to the channel users, direct sales users can not apply. 　　Specific methods: 1 users after landing million net, you can in the left "product purchase-domain Name Service-Online transfer application", agreed to online agreement, apply for open online transfer function. 20,000 Network Audit ...