Java implements 23 design patterns: Adapter Pattern

Classification of 23 design patterns 1, Overview The Adapter Pattern serves as a bridge between two incompatible interfaces. This type of design pattern belongs to structural pattern, which combines the functions of two independent interfaces. This pattern involves a single class that is responsib ...

Posted by wiley on Thu, 04 Jun 2020 20:00:48 -0700

IOS startup map and open screen advertising map, similar to Netease

Boot map is an essential part in the development of iOS. Many app s will have a customized open screen ad map after the boot map. Click the ad map to jump to the corresponding page of the ad map. Today, I'd like to share with you how to add this ad map and click the jump of ad map. This ad map is imp ...

Posted by gutogouveia on Thu, 04 Jun 2020 09:38:43 -0700

Reduce the use of if

Recently, a batch of code has been maintained, including the use of a pile of if... With 8 or 9 layers of nesting in many cases, which is extremely painful. Therefore, search for some ways to reduce if...else to improve the code and write a simple summary.     The first: Before optimization if (measuredValue > 8) return 5 * measuredVal ...

Posted by realtek on Thu, 04 Jun 2020 08:38:47 -0700

Sword finger offer_ Programming questions_ java version (21-27)

Article catalog Push and pop sequence of stack Print binary tree from top to bottom Post order traversal sequence of binary search tree Path with a certain value in a binary tree Replication of complex linked list Binary search tree and double linked list Arrangement of strings Push and pop sequ ...

Posted by Delaran on Thu, 04 Jun 2020 06:26:48 -0700

Oracle learning - PL/SQL assignment, type, exception, if, loop

summary: PL/SQL(Procedural Language/SQL) is a special application development language of Oracle database. It is a programming language formed after the process expansion of the standard SQL language. PL/SQL Oracle extends SQL procedure. PL/SQL database programming Benefits: simple, efficient, flexible and practical 1. Grammar Basic syntax: ...

Posted by cheshil on Wed, 03 Jun 2020 03:08:17 -0700

Detailed explanation of analysis function and set operation in Oracle

1, Analysis function RANK the same value RANK the same, RANK jump DENSE_RANK the same value rank the same, rank consecutive ROW_NUMBER returns a sequential ranking, regardless of whether the values are equal or not The following figure is an example of three ranking methods --The following three analysis functions can be used for ran ...

Posted by chopperwalker on Tue, 02 Jun 2020 08:32:46 -0700

Introduction to antagonistic training - trying to deceive a model

Author: Zhi Guangda When we are actually deploying a machine learning system, one of the most important things is the robustness of the system. We hope that the system will not only be effective for most cases, but also be truly reliable, such as being able to recognize attacks from others (deceiving your classification model).Therefore, the to ...

Posted by deadlyp99 on Tue, 02 Jun 2020 05:01:50 -0700

Start using Elasticsearch: Learn how to search

This article is from https://blog.csdn.net/UbuntuTouch/article/details/99546568 , with amendments and deletions. In the previous article, we have described how to use the REST interface to create index es, documents, and actions in ES.In today's article, we'll show you how to use ES to search for our data.ES is a near real-time search.Let's c ...

Posted by evmace on Tue, 02 Jun 2020 03:08:05 -0700

mutex and lock in C + + multithreading

@ catalog 1, Basic concepts 2, How to use 2.1 mutex.lock(),unlock() 2.2 std::lock_guard class template 2.2.1 std::lock_ STD:: adopt of guard_ Lock parameter 2.3 std::unique_lock function template 2.3.1 unique_ The second parameter of lock 2.3.2 unique_ Member function of lock ...

Posted by jeffkee on Mon, 01 Jun 2020 04:00:45 -0700

LINQ performance analysis

catalog Choose the appropriate flow operation mode Be careful to execute immediately Will LINQ to Objects degrade code performance Different methods What has been learned The cost of using LINQ to Objects Performance and simplicity: can't fish and bear paw have both LINQ's advantage is not to provide any new functions, but to enable us t ...

Posted by TreColl on Sun, 31 May 2020 21:06:09 -0700