Programmer Think

1. Circular printing public class OutWord { private String word = "output A"; public synchronized void outA() throws InterruptedException { if (word.equals("B output")){ this.wait(); } //Output word System.out.println("word = " + word); word="B output"; this.notify(); } ...

In daily development, we often need to test the execution time of some code, but we don't want to use JMH( Java Microbbenchmark harness (Java micro benchmark suite) is such a heavy testing framework, so this paper summarizes some commonly used execution time statistics methods in Java, including the following 6 kinds in total, as shown in the f ...

4. constant Constant: refers to the fixed data in the Java program. classification typemeaningData examplesinteger constant integerPositive and negative integersDecimal constantdecimalPositive and negative decimalscharacter constants Enclosed in single quotation marks, there is only one character and cannot be empty'word', 'a', '1'string con ...

Python assignment operator What are the assignment operators? operatordescribeExamples=assignmentc = a+b-=Subtraction assignmentc -= a -> c = c - a=+Additive assignmentc += a -> c = c + a*=Multiplicative assignmentc *= a -> c = c * a/=division assignment c /= a ->c=c / a%=Modular assignmentc %= a -> c= c % a**=Power assignm ...

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 ...

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 ...

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 ...

Introduction and description Four traditional mainstream databases:     Oracle MySQL SqlServer DB2 Non relational database: Redis MongoDB The mainstream database is relational database: there is an association relationship between tables When we say install database, we mean install database service When creating a database, it refers t ...