Java

[Spring Data Repositories] study notes -- use existing repository and springrepository The following are some notes about Spring Data Repositories in Spring-Data-mongoDB. Memo! I feel that I am still familiar with official materials.   Spring Data

Two digits in a string appear only once, and the rest are in pairs. Of course, if the problem is that there is only one different number, and other numbers are the same in pairs, then all numbers are exclusive or this number is obtained. This time

I made a simple image similarity calculator using JAVA.Key Algorithms: Copy code 1 // full process 2 public static void main (String [] args) throws IOException {3 // get image 4 File imageFile = new File ("c: /1.jpg"); 5 Image image = ImageIO. read

EasyUI replaces non-16 icons We know that the native icons of easyUI are ugly. Therefore, to achieve a better user experience, it is very necessary to replace its icon. Native easyUI icons: However, the easyUI-linkbutton component in easyui only

Use custom ListView to solve the nested problem in scrollView In my opinion, the custom listView control is relatively simple and can solve the problem of nesting listview in scrollView. The Code is as follows:   public class MyListView extends

Design Model-factory model learning1. Concepts   Factory mode definition: instantiate an object and use the factory method instead of the new operation. Achieve decoupling (avoid hard coding coupling ). The Factory method mode is the class creation

Spring Source Code-Start 21. The Container starts and triggers the ServletContextEvent event. Create a WebApplicationContext and prepare the configuration.2. protected void configureAndRefreshWebApplicationContext (ableablewebapplicationcontext wac,

Java Properties usage and format definition, javaproperties Java. util. PropertiesExtendsHashtable A text resource tool that allows you to conveniently read key-value pairs.  Overview of common methods Initialization object New Properties

Automatic slf binding implementation process judgmentThe binding implementation class is based on the agreed principle: the following steps are taken to determine the implementation class:1. the LoggerFactory scan implementation class path has

Data Structure: Graph implementation-adjacent table Graph structure using an adjacent table When the number of edges in the graph is small, using the adjacent table to implement the graph structure will waste a lot of memory space. Therefore,

Quick Gaussian filter function [improved version]   Corrected and optimized the variables. Previously, the author's function only supports 2nd-power images. This correction (the bitmap row width in windows is 4-byte aligned ). It is basically

Design Pattern learning-Abstarct FactoryWhat Abstarct Factory: provides an interface for creating a series of related or mutually dependent interfaces without specifying their specific classes. Why Abstarct Factory is a type of creation design

All sorting and searching algorithms Import javax. mail. part;/*** sequential search and sorting ** @ author was built * @ version Creation Time: 04:15:10 */public class SequentialSearch {public static void main (String [] args) {Integer [] a = }; /

Usage of Spring Scheduled TimerAbstract: A Timer is often used in coding. It specifies to execute a code segment every one hour, or at every day. If java. util. Timer is used to do this kind of thing, there is no need to repeat the wheel.

Example of SharedPreferences storage obtaining information SharedPreferences is easy to use and can easily store and read data. SharedPreferences can only store simple types of data, such as String and int. Generally, the data of complex types is

Talking about Hibernate-getting started     What is Hibernate?   Hibernate is a lightweight ORMapping framework. The ORMapping principle (Object Relational Mapping) is to map the data in the Object to the data in the database according to certain

Java basics-Regular Expressions1. Why is a regular expression required? Regular Expressions can easily match data and perform more complex string verification, splitting, and replacement functions. For example, to determine whether a String is

Calculate the maximum ordered string in any unordered string Private void compare () {// define an unordered String str = "sdifsdafsdabfwqicweedio"; // place it in a hashset to deduplicate A HashSet Set = new HashSet (); For (int I = 0;

Rewrite the ajax method to redirect to the logon page when the asynchronous request session expires Generally, we will judge the logon status in the filter. If we do not log on, we will jump to the logon page. The core java code of the filter is as

Think in java note (1)I don't know what to do after work. Everything we should do is almost done. Let's take a look at spring's things. After all, these things are mostly used. But I want to take a look at javaee. There are many design patterns in