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git command line window common commands Configure user name and mailbox git config --list View configuration information git config --global user.name="hello" Set user name git config --global user.email="XXXX@qq.com" Set mailbox git init initialization git Project (build) .git Directory (actually a hidden folder) git clone Clone address cl ...

Default size of hashMap Knowledge point: a prime number that is not close to the integer power of 2 is often a better choice for the size of hash table. /** * The default initial capacity - MUST be a power of two. */ static final int DEFAULT_INITIAL_CAPACITY = 1 << 4; // aka 16 public Hashtable() { this(11, 0.75f); } ...

Statement: 1 ***               2. Because it is a personal summary, write the article with the most concise words               3. If there is any mistake or improper place, please point out Introduction ...

Redisson distributed lock implementation principle and source codeSource code analysisSimple business codeIt is mainly responsible for the source code entry. There are three main methods to use distributed locksRLock lock = redissonClient. Getlock ("HPC lock") gets the class that implements reentrant distributed lockslock. Locklock. U ...

1, Channel Selectors Next, take a look at Channel Selectors Channel Selectors include: Replicating Channel Selector and Multiplexing Channel Selector The Replicating Channel Selector is the default Channel selector. It will send the events collected by the Source to all channels Check the official documentation for an explanation of this defau ...

1, rest framework version introduction In the previous article, we introduced three authentication functions of the rest framework, perform_ Authentication, permissions and throttles, which are inherited from the View method through APIView and reflected by the dispatch method through initialize_ The request method encapsulates a request(R ...

CF540C Ice Cave problem solving Report 1 topic link http://codeforces.com/contest/540/problem/C 2 topic arrangement 2.1 Title: ice cave 2.2 Title Description You play computer games. Your character stands on one level of a multi-level ice cave. In order to move on, you need to go down one layer. The only way is to fall off the ice. Your ...

Anyway, brother y said that he would definitely enter the national competition after brushing. I'll try~ 1, Recursion and recursion 92. Recursive implementation of exponential enumeration (simple) Note that this problem is to solve the combination!! import java.util.LinkedList; import java.util.Scanner; public class Main { static Link ...

1. Introduction We know that http is a stateless protocol, that is, for server applications, two http requests are independent of each other. You don't know me, I don't know you. Then the problem comes. For example, when shopping on an e-commerce website, you need to browse the goods, add the goods to the shopping cart, and place an order for ...

preface JUnit is a unit test framework of Java programming language, which is a simple framework for writing reusable test sets. JUnit has a very important development in test driven development. It is one of the unit testing frameworks collectively called xUnit, which originated from JUnit. XUnit is a test framework based on test driven ...