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Catalog Explain simple form Anonymous type form Conditional form Specified type form Screening Forms Shaped form Nested form Local invocation method form Distinct Form Explain The query expression select is placed at the end of the expression, which is similar to the function of select in the SQL command but different in locatio ...

start Say last weekend idle egg pain, suddenly want to know how to deal with the front-end gesture, so as to solve their own knowledge blind spot, and began to gnaw the source code... And record it. A gesture Complex gestures in our front-end pages should be rare, usually dragging, double-clicking, zooming in and out of these, but the rational ...

My mailbox: <kco1989@qq.com>.Welcome to reprint. Please indicate the website for reprinting. http://blog.csdn.net/tianshi_kcogithub: https://github.com/kco1989/kcoThe code is fully hosted github Students in need download it by themselves Introduction In the last article Write different profit sharing rules using simple factories One probl ...

Android custom Behavior implements sliding with gestures, showing hidden Title bars, bottom navigation bars and suspension buttons Coordinator Layout under the Android Design package is a very important control that makes many animation implementations possible and easier. According to the official explanation, Coordinator Layout is the pa ...

Queue: Special linear tables that allow insertion of data at one end and deletion of data at the other end only.The end of an insert operation is called the end of the queue and is often called the queue entry; the end of a delete operation is called the queue head and is often called the queue exit.Queues have a FIFO feature. Queues are divi ...

Preface Thread pool is a common optimization method in concurrency. Thread reuse can reduce thread creation, reduce resource consumption and improve program response speed. In Java, we usually create thread pools through the factory method provided by Exectuors, but the final implementation class of thread pools is ThreadPoolExecutor. Let's ana ...

Countdown. gif On the left is the output desk and on the right is the tableView. After clicking modal, a controller stops the timer. I. Main Functions For tableViewCell, there is always the problem of multiple cell s randomly timing, so a tool class is written.It encapsulates stop countdown and start countdown. Provides the countdown unit t ...

The article was originally created by the author. If it is reproduced, please indicate the source. If it is the same, it is the same. ~ (who care!) 1. Write before This is the first part of the Source Analysis Program. The blogger is going to pass through some of the commonly used collection sources, such as ArrayList, HashMap and their corresp ...

Label PostgreSQL, Fuzzy Query, Regular Query, pg_trgm, bytea, gin, Functional Index background Pre-fuzziness (with prefix fuzziness), post-fuzziness (with suffix fuzziness), pre-and post-fuzziness (without prefix fuzziness), and regular matching are common requirements in the field of text search. PostgreSQL has a strong text search capabili ...

L2-004. Is this a binary search tree? Chen Yue A binary search tree can be defined recursively as a binary tree with the following properties: for any node, The key values of all nodes in the left subtree are less than those of the nodes. The key value of all nodes in the right subtree is greater than or equal to the key value of the node. ...