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Process control statement Sequential structure word order /* Process control statement: Sequential structure statement: relatively simple The code is loaded from top to bottom (from the beginning of writing HelloWorld, it is a sequential structure statement) Select structure statement Circular structure statement */ //The jvm loads this ...

01. What is annotation Annotation is from jdk5 New technologies introduced from 0Function of Annotation Not the program itself, you can explain the program (this is no different from comments)It can be read by other programs (such as compiler, etc.) Format of Annotation Annotations exist in the code as @ annotation name. You can also add ...

1. Method overload 1.1 method overload Method overload concept Method overloading refers to the relationship between multiple methods defined in the same class. Multiple methods that meet the following conditions constitute overloading with each other Multiple methods in the same classMultiple methods have the same method nameMultiple ...

1. Date class java. The util package provides a Date class to encapsulate the current Date and time. The Date class provides two constructors to instantiate a Date object. constructor date(): get the number of milliseconds from January 1, 1970 Methods in Date Long getTime(): get timestamp (i.e. milliseconds) int compareTo(Date ...

Let's give a small example to illustrate what is control inversion IOC? In the initial stage, we write code as follows: Create a new UserDao and its implementation class public interface UserDao { void save(); } public class UserDaoImpl implements UserDao { public void save() { System.out.println("UserDao.save"); } } ...

1. Member variables and local variables 1.1 differences between member variables and local variables Different positions in the class: member variable (outside the method in the class) local variable (inside the method or on the method declaration)Different locations in memory: member variables (heap memory) local variables (stack memory) ...

After microservices, many originally simple problems have become complex, such as global ID! Brother song just used this content in his recent work, so he investigated several common global ID generation strategies on the market and made a comparison for his partners' reference. After the database is divided into databases and tables, the ...

All supporting materials have been uploaded to QQ group: 167356412; if necessary, the group file can be obtained by yourself Spring Cloud China community official website: http://springcloud.cn Spring Cloud China Community Forum: http://bbs.springcloud.cn Spring Cloud China community documentation: http://docs.springcloud.cn 1, Introduc ...

catalogue  1.File class Basic functions of File class 2.IO flow Classification of IO Byte stream - output Byte stream try catch finally catch exception Byte stream - input Buffer stream Character stream - encoding table Character stream - write out data Character stream - read data Buffer stream Conversion flow Object operati ...

Continued → 7. Many to one processing Many to one understanding: Multiple students correspond to one teacher For students, it is a many to one phenomenon, that is, a teacher is associated with students! Database design CREATE TABLE `teacher` ( `id` INT(10) NOT NULL, `name` VARCHAR(30) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=I ...