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Implement the simplest deadlock (Java version) ```java /** * @author wall * @date 2019/7/29 16:42 * @description Implement A deadlock: thread A obtains the lock held by thread B, and thread B obtains the lock held by thread A */ public class DeadLock { //Define two locks private static ReentrantLock lockA = new ReentrantLock(); ...

1. What makes generics? 2. Why use generics? 3. How to use generic [class, interface, method] 4. Limitations of generics. What makes generics?  1. Generic: when a class is defined, it does not set the data type for the attribute and method [return value, parameter] in the class. When you create an object of this class, you specify t ...

threading namespace Location: in the include/log4cpp/threading directoryThe corresponding classes are under the threading namespace. This namespace contains some thread synchronization classes and methods to get the current thread. There is also an implementation of thread scoped local variablesBecause thread is a system kernel object, and dif ...

catalogue inherit Concept of inheritance Inherited syntax Access to parent class members super keyword The difference between super and this Execution order and inheritance mode of inheritance relationship Polymorphism Implementation conditions of polymorphism rewrite The difference between rewriting and overloading Upward and downw ...

Hello, everyone! I'm Xiao Sheng! I learned the knowledge of classes and objects from Mr. Han Shunping and gained a lot! Now let's share our notes! Common class Wrapper class Classification of packaging PackagingBasic data typeDirect parent classbooleanBooleanObjectcharCharacterObjectbyteByteNumbershortShortNumberintIntNumberlongLon ...

Java priority queue Introduction to PriorityQueue PriorityQueue is the priority queue. Priority queue can ensure that the elements taken out each time are the smallest or largest elements in the queue (Java priority queue defaults to the smallest element taken out each time). Size relationship: the comparison of elements can be naturally ...

Official website address https://min.io/ Official website document https://docs.min.io/docs/minio-quickstart-guide.html Download address https://dl.min.io/ Basic concepts Object: the basic object stored in Minio, such as file and byte streamBucket: the logical space used to store objects. The data of each bucket is isolated from each oth ...

The following is the initialization loading of IOC container based on Xml. Please refer to the previous article for the positioning of the container Initialization of IOC container based on Xml (I) positioning 3. Start The spring IOC container loads Bean configuration resources from the refresh () function. Refresh () is a template method tha ...

In business, you need to use modules A and B, which use spring Session to share Session data. The business in module B can only be operated after the user logs in. When A calls B's service, it cannot obtain the user's Session information in module B, resulting in module B determining that the requesting user has not logged in, resulting in modu ...