Programming VIP

1, Foreword Write in front: it took a day to sort out the data collected by small codewords. It's helpful for you. One key three times in a row. Ha, thank you!! HashMap is often encountered in our daily development. The source code and underlying principle of HashMap must be asked in the interview. Therefore, we should master it, which is ...

Structural pattern mainly involves how to combine various objects in order to obtain a better and more flexible structure. Although the object-oriented inheritance mechanism provides the most basic function of subclass extending the parent class, the structural pattern not only uses inheritance simply, but also realizes more flexible functions ...

1, What is a Servlet servlet is one of the Java EE specifications, which is the interface Servlet is one of the three major components of Java web. The three major components are: servlet program, filter and Listener listener. Servlet is a Java applet running on the server. It can receive the request sent by the client and respond to the da ...

1. Classes and objects Comparison of object-oriented and process oriented ideas: Process oriented: it is a process centered programming idea. Each step of realizing the function is realized by itself. Object oriented: it is an object-centered programming idea, which realizes specific functions by commanding objects. 1.1 relationship bet ...

1, Introduction 1.1 function of lengthfieldbasedframedecoder The LengthFieldBasedFrameDecoder can customize the length to solve the problem of TCP packet sticking. Therefore, it is also called "basedlength" 1.2 TCP packet sticking and packet sticking TCP sticky packet refers to that several data packets sent by the sender are glu ...

MyBatis study notes Knowledge preparation: JDBCMysqlMavenJunit 1. Introduction 1.1. What is MyBatis? MyBatis is an excellent persistence layer framework It supports custom SQL, stored procedures, and advanced mapping. MyBatis eliminates almost all JDBC code and the work of setting parameters and obtaining result sets. MyBatis can confi ...

Integration of spring and MyBatista in spring learning (1) 1. Integration of spring and MyBatista 1.1 integration process and ideas 1.1.1 Mybatis As we all know, mybatis evolved from ibatis of Apache and is a persistence layer framework based on Java. Mybatis annotation 𞓜 xml file is used for configuration or original mapping. Mybatis refe ...

Writer: character output stream base class Structure diagram OutputStreamWriter character output stream summary Transform stream Java io. Outputstreamwriter is a subclass of Writer and a bridge from character stream to byte stream. It encodes characters into bytes using the specified character set. The character set it uses can be spe ...

1. Adapter mode Adapter pattern is a structural design pattern that enables objects with incompatible interfaces to cooperate with each other. The adapter can act as a wrapper between two objects. It will receive calls to one object and convert it to a format and interface recognized by another object. 2. The adapter mode is suitable for appl ...

1.JDK,JRE,JVM JDK: short for Java Development Kit, Java Development Kit, provides the development environment and running environment of Java. JRE: short for Java Runtime Environment, Java Runtime Environment, which provides the required environment for the operation of Java. Including Java virtual machine and core class library required by J ...