Programmer Think

backgroundIn the process of java project development and testing, you need to repeatedly modify the code, compile and deploy. In some large projects, the whole compilation and deployment process may take several minutes or even tens of minutes. During the joint debugging of front and rear interfaces or the modification of test problems, only on ...

Interview collection: https://gitee.com/mydb/interviewOptional parameters (varargs) are new features in JDK 5, also known as variable length parameters or variable parameters. It means that "..." can be used in the parameters of a method To indicate that this method can accept infinite parameters. This representation method is called ...

1. Limit prop to type list Using the {validator} option in the prop definition, you can limit prop to a specific set of values: export default { name: 'Image', props: { src: { type: String, }, style: { type: String, validator: s => ['square', 'rounded'].includes(s) } } }; Copy code The validator f ...

This is distributed by the database. The application is transparent. There is no need to modify anything in the code. 2.2 internal documents Go to the data directory first. If you don't know the directory location, you can: Next, look at the internal files: As can be seen from the above figure, there are two types of files frm files and ...

Enumeration classes: Use of enumerated classes: When the object of a class is finite, deterministic Week: Monday,..., Sunday Gender: Man (male), Woman (female) Season: Spring (Spring Festival)...Winter (Winter) Payment methods: Cash (cash), WeChatPay (WeChat), Alipay (Alipay), BankCard (bank card), CreditCard (credit card) Initiation status: B ...

Reference - alias (&) Type name& Reference variable name (object name)=Reference entity; Instead of defining a new variable, a reference gives an alias to an existing variable. The compiler will not open up space for the referenced variable. It shares the same memory with its reference characteristic References must be initi ...

The while loop and if statements are used to calculate and output the even sum of 1-100. The loop variable is named i and the stored variable is named sum. public class Test { public static void main(String[] args) { int sum=0,i=1; while(i<=100) { if(i%2==0) { sum=sum+i; } i++; } System.out.println(sum); } } The ...

The blogger has previously worked in the collection and payment system of Hengfeng Bank (equivalent to the payment interface), including the current OLTP API transaction interface and the external data interface of virtual business. In short, when you have done a lot of projects and written a lot of code, you need to go back and summarize more, ...

I General description II Analysis of Spring source code III Examples Premise: Spring version is 5.0 x I General description 1. BeanFactoryPostProcessors It is an important extension point interface provided during the creation of the Spring container. It has a postProcessBeanFactory() method. When the scanning is completed according to the s ...

Add the Java configuration class EruptConfig of Erupt, subject to the package of starting MallTinyApplication, and configure the package scanning path; /** * Created by macro on 2021/4/13. */ @Configuration @ComponentScan({"xyz.erupt","com.macro.mall.tiny"}) @EntityScan({"xyz.erupt","com.macro.mall.tiny"}) @EruptScan({"xyz.erupt","c ...