Programmer Think

Note: Title: You are playing balls and cows with your friends. The rules of the game are as follows: You write a secret number and ask your friend to guess what the number is. Every time a friend guesses, you will give him a hint to tell him how many digits in the guessed number belong to the number and the exact position are guessed correctl ...

array 1. Memory analysis: Array memory analysis: 2. Basic characteristics of array The length is determined. Once created, the size cannot be changed. If the boundary is exceeded, an error is reported: ArrayIndexOutofBoundsExceptionElements must be of the same typeThe elements in the array can be any data type, including basic and refer ...

Annotation, reflection, dynamic proxy The knowledge points involved are annotation, reflection, dynamic agent, AOP, Lombok, agent mode and ` builder mode``````````` Q: Have you ever used annotations in your work? Let's briefly introduce them. A: Annotations are often used in daily development, including @ overridden, @ Deprecated provided by ...

Summary of MyBatis common interview questions 1. What is MyBatis? 1. MyBatis is a semi ORM (object relational mapping) framework. It encapsulates JDBC internally. During development, you only need to pay attention to the SQL statement itself, and you don't need to spend energy dealing with the complicated processes such as loading driver, ...

public final class RequestOptions extends BaseRequestOptions<RequestOptions> { private static RequestOptions skipMemoryCacheTrueOptions; private static RequestOptions skipMemoryCacheFalseOptions; private static RequestOptions fitCenterOptions; private static RequestOptions centerCropOptions; private static RequestOptions circleCropOption ...

Part I - self introduction Part II - basic knowledge of Java 1. Differences between interfaces and abstract classes abstract class Abstract modified classes are abstract classes, and modified methods are abstract methods.Abstract classes can have no abstract methods, but classes with abstract methods must be declared as abstract classes ...

The leaf segment mode is an optimization to directly use the self increment ID of the database as the distributed ID to reduce the frequency of database operation. It is equivalent to obtaining self incrementing IDs from the database in batches. One number segment range is taken out from the database each time. For example, (11000] represents 1 ...