Programmer Think

Polymorphism is one of the basic principles of object-oriented software.The term often refers to things that can take many forms.In an object-oriented approach, polymorphism makes it possible to write programs with late-bound references.Although it is easy to create polymorphic references in Java, the concepts behind them have a far-reaching im ...

introduce Digital signature is a digital string that can not be forged by others only by the sender of the message. This digital string is an effective proof of the authenticity of the information. Sender: generate signature Recipient: verify signature Asymmetric cryptography In asymmetric encryption, the public key is used for encryption and ...

Download and install node npm Get into node Select Windows installation package (. MSI) 64bit to download and install Using msi will configure the environment variable path, which is convenient All commands are basically in the project path or directly in the terminal of idea //Open the command prompt to test whether the instal ...

order This paper focuses on the remoting toomuchrequestexception of rocketmq RemotingTooMuchRequestException rocketmq-remoting-4.6.0-sources.jar!/org/apache/rocketmq/remoting/exception/RemotingTooMuchRequestException.java public class RemotingTooMuchRequestException extends RemotingException { private static final long serialVersionUID = 43 ...

191214 spring boot series tutorials automatic configuration selection takes effect After writing a series of Spring blogs for so long, I found a problem. All previous articles focused on making one thing work. Is there anything that goes against it? We know that @ ConditionOnXxx can be used to determine whether a configuration class can be ...

**Problem Description: when using the default scheduled tasks of springboot, if there are multiple tasks, the framework will only start one thread for execution by default, which will cause some tasks cannot start execution at the specified time** **In addition, a separate record will be written about the synchronization lock of timed tasks un ...

The picture is quoted from mooc.com. I have realized a simple linked list myself Realization class LinkedList<E> { private class Node { public E e; public Node next; public Node(E e,Node next) { this.e = e; this.next = nex ...

drf serialization component Basic use urls.py from django.urls import re_path urlpatterns = [ re_path(r'books/$', views.BookView.as_view()), re_path(r'books/(?P<pk>\d+)/$', views.BookFilterView.as_view()), ] serialization class from rest_framework import serializers class BookSerializer(serializers.Serializer): title = seri ...

Title Link: Order me, please Main idea: nnn items, each item has its own price PPP, the level of the item is LLL, and the number of items that can be replaced is XXX. The X-line of each item gives the item number that can be replaced and the gold coins needed for replacement. At the same time, the grade difference of the items ...

To: https://segmentfault.com/a/11900013532009 In the last article Spring boot application startup principle (1) embedding startup script into jar The principle of how springboot integrates the startup script and Runnable Jar into Executable Jar is introduced in so that the generated jar/war file can be started directly This article will show h ...