Principle and implementation of thread pool
$1. General
Background of thread pool: high concurrency projects often need to enable a large number of threads at the same time, so a large number of threads need to be created. Frequent creation of new threads and killing of old threads will greatly slow down the performance of CPU. Therefore, use the thread pool to initialize several threads ...
Posted by slibob on Wed, 25 May 2022 11:51:41 +0300
Graphical user interface: Swing component list
7, Check box
Check boxes provide a way to make a single selection of "checked" or "unchecked". It contains a small box and a label. This box usually has an "x" mark (or other mark indicating "selected") or is empty, depending on whether the check box is selected.
JCheckBox is usually created using a con ...
Posted by mdowling on Wed, 25 May 2022 10:54:33 +0300
Java Facade
1, Lead to the question of building a home theater:
There are DVD player, projector, automatic screen, surround sound and popcorn machine in the home theater. It is required to complete the function of using the home theater. The process is as follows:
• direct remote control: coordinate the switch of each equipment
• popcorn opener
& ...
Posted by intenseone345 on Wed, 25 May 2022 09:09:47 +0300
@Usage of Query annotation (Spring Data JPA)
Reference article: http://www.tuicool.com/articles/jQJBNv
1. A simple example of @ Query annotation
@Query(value = "select name,author,price from Book b where b.price>?1 and b.price<?2")
List<Book> findByPriceRange(long price1, long price2);
2. Like expression
@Query(value = "select name,author,price from Book b where b.name ...
Posted by sandthipe on Wed, 25 May 2022 08:55:33 +0300
Meituan distributed ID generator (Leaf), which can't be missed, is an easy-to-use batch
Leaf
Leaf is a distributed ID generation service launched by meituan. Its name is taken from the words of German philosopher and mathematician Leibniz: "there are no two identity leaves in the world." ("there are no two same leaves in the world"), taking a name has such moral meaning, meituan programmer Niu break!
Advantag ...
Posted by Chris_Evans on Wed, 25 May 2022 07:06:18 +0300
Under what conditions is StringBuider more efficient?
introduction
It is said that String builder is more efficient than String in dealing with String splicing, but sometimes there may be some deviation in our understanding.
Recently, when I tested the efficiency of data import, I found that my previous understanding of string builder was wrong. Later, I found out the logic of this piece by mean ...
Posted by gausie on Wed, 25 May 2022 06:05:45 +0300
This article covers all the problems related to Java inheritance
Related articles:
Object oriented re exploration : the basic concept of object-oriented is introduced
Detailed explanation of object creation in Java : describes the creation of objects and the use of constructors
stay Object oriented re exploration The concept of inheritance has been introduced in general in this article. Here are the spec ...
Posted by iyia12co on Wed, 25 May 2022 02:40:07 +0300
java data structure and algorithm three: linked list (single linked list)
Linked List: Singly Linked List
1. Introduction to linked list
A linked list is an ordered list, but it is stored in memory as follows:
The summary is as above:
1) The linked list is stored in the form of nodes, which is chain storage
2) Each node contains data field, next field: points to the next node
3) As shown in the figure: It is found t ...
Posted by Mr Camouflage on Wed, 25 May 2022 02:04:36 +0300
[CRM learning and development Day1 of SSM framework project customer relationship management system]
1.1 home page function
demand
When users visit the project home page, they first enter the login page.
Timing & flow
IndexController
@Controller
public class IndexController {
/*
Theoretically, assign a url to the Controller method: http://127.0.0.1:8080/crm/
For simplicity, the protocol: / / ip:port / application ...
Posted by goldfiles on Wed, 25 May 2022 00:07:31 +0300
Getting started with Java se: iterators and comparators
iterator
Iterator
Syntax format:
Iterator it = collection object iterator();
In a collection, simply call the collection object's own iterator() to create an iterator for the collection
Three methods in iterators:
Boolean hasnext() determines whether there are elements in the next bit of the current cursor. If there are elements, it returns ...
Posted by aviavi on Tue, 24 May 2022 21:32:20 +0300