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1, Why choose a thread pool and create threads when not in use? Pooling Technology: prepare some resources in advance, and reuse these prepared resources when needed. Common pooling technologies include thread pool, memory pool, database connection pool and HttpClient connection pool. As a practice of pooling technology, thread pool is e ...

Function decoratorIn Python, Decorators are mainly used to modify the function of the function, and the modification premise is to change the original function code. The decorator will return a function object. Therefore, in some places, the decorator will be called "function of the function". There is also a design pattern called &q ...

Why do we need flexible arrays? #define MAXLEN 1024 struct kd_node { struct kd_node*left; struct kd_node*right; int dim; unsigned long long data[MAXLEN]; }; In this code, in order to store data, an unsigned long long array with a length of 1024 is applied. If the array length is much smaller than MAXLEN. This design will be an extremely ...

Reference tutorial: Python object-oriented promotion and sending and receiving mail 04 Python object-oriented promotion and sending and receiving mail 05 Python object oriented promotion and email 06 Dynamically add properties and methods to instances It embodies the characteristics of dynamic language (flexible)Attributes and methods add ...

preface This article introduces the implementation of student management system with Python. This article is actually the first chapter of my long article. It is cut out separately here to facilitate everyone's viewing. The code in this article is executable code. It is recommended that readers read the code and write it by hand. The cod ...

VIII Spring transaction management A transaction can be regarded as a unit * * (whole) * *, which is composed of several operations on the database. When we develop enterprise applications, the most common operation for business members is the combination of multi-step operations for data reading and writing. Exceptions may occur at any st ...

preface Hello, everyone. Today, brother chicken wing continues to give you an in-depth understanding of multithreading. We all know that multithreading can be implemented in two ways: one is to implement runnable interface and the other is to implement callable interface. Both of the submit methods of the thread pool can be passed as parameter ...

At jdk1 In 8, the Classloader loads the bytecode of the class to the JVM. It follows the loading mechanism of the parental delegation model. It is mainly loaded by bootstrap Classloader, extclassloader, AppClassloader, and then the custom Classloader. This is mainly to ensure the internal class loading security of JDK, so the classes of the jar ...

1. Five states of threads New: a new thread object is created Runnable: when the start method is called, the thread is in an executable state. Running: the executable thread object obtains the time slice of the cpu and is scheduled by the cpu for execution. Blocked: the thread gives up the right to use the cpu for some reason and temporarily s ...

Java Record serialization related At the beginning of the design, Record is to find a type carrier that purely represents data. Java's class is now doing function addition through continuous iteration, and its usage has been very complex. Various syntax sugars, various polymorphic constructors and various inheritance designs lead to the very c ...