JDBC connection pool
The creation and destruction of Connection objects for one-time use takes time. Connection pool can reuse connections and avoid waste. When the program initializes, it initializes multiple connections and puts them into the pool (Collection). Each time, it can be obtained directly from the connection pool. After u ...
Posted by .-INSANE-. on Fri, 10 Sep 2021 12:35:34 -0700
1. Java Anonymous Internal Class
There are several important points to remember when using anonymous internal classes: (1) Anonymous inner classes cannot have constructors. (Because anonymous inner classes have no class names) (2) Anonymous internal classes cannot define any static members, methods, and classes. (3) An anonymous internal c ...
SecondThread sec = new SecondThread("zs"); SecondThread thr = new SecondThread("lsii"); //Set sec and thr threads as daemon threads sec.setDaemon(true); thr.setDaemon(true); //Start sec.start(); thr.start(); //When it is found that sec and thr are daemon threads, it will be interrupted
* **Interrupt thread**: `public void interrupt()`: This ...
Posted by jllydgnt on Thu, 09 Sep 2021 19:36:43 -0700
)2-1. Three treatment methods
)2-1-1. Single loop insertion
We take 10w pieces of data for some tests. If the insertion method is program traversal loop, insert one by one. It is detected that the speed of inserting a message on mysql is between 0.01s and 0.0 ...
Posted by tmswenson on Thu, 09 Sep 2021 14:47:19 -0700
Find expansion port
Take a closer look and see when the thread pool was created?
The entry is shown in the figure below. Each time a new HystrixCommand is created, the constructor of the parent class will be called:
As shown in the figure above, the initThreadPool will create a thread pool. It should be noted that the first argument here, ...
Posted by tcarnes on Wed, 08 Sep 2021 13:41:13 -0700
In daily development, object conversion is frequently used, which can be roughly divided into shallow copy and deep copy. If subdivided, deep copy can be subdivided into several types. This paper makes a series of tests based on several mainstream deep copy methods, and explores the principles and scenarios.
Readers are welcome to d ...
Posted by wilorichie on Wed, 08 Sep 2021 10:36:46 -0700
Suppose you are developing a logistics management application. The original version could only handle truck transportation, so most of the code was in a class called truck.
After a while, this app became extremely popular. You can receive more than ten requests from shipping companies every day, hoping that the application can su ...
Posted by Xyphon on Mon, 06 Sep 2021 19:16:29 -0700
Like the factory method mode, the abstract factory mode is also composed of four elements: abstract factory, concrete factory, abstract product and concrete product. However, the number of methods in the abstract factory is different, so is the number of abstract products.
The main roles of the abstract factory pattern are as follows:
1. Abst ...
Posted by tecdesign on Mon, 06 Sep 2021 17:44:24 -0700
The Adapter pattern converts the interface of a class into another interface that the customer wants. So that those classes that could not work together due to interface incompatibility can work together.
The adapter pattern has two different forms: class adapter and object adapter.
2, Structure of adapter mode
Define a specific ...
Posted by andre_c on Mon, 06 Sep 2021 13:10:21 -0700