What are the steps to learn java

java The learning steps are: 1. Enter the learning stage of Java language basics; 2. Master the common features of object-oriented languages; 3. Proficient in JDK core API programming technology; 4. Proficient in SQL statements; 5. Proficient in JDBC API; 6. Understand the meaning of iteration; 7. Master common design patterns.

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java The learning steps are:

The first step: First of all, make preparations before learning: Java language is generally used for large-scale server program development, so it is necessary to understand the following: Unix development environment Unix system principles, Unix development environment, and common Unix commands. Proficient in common Unix commands; proficient in building a Java development environment.

The second step: Then enter the learning stage of Java language basics. To learn any language, you must lay a solid foundation. For those who have learned high-level programming languages ​​​​(C, C, etc.), the Java language foundation has its own characteristics, but the basic rules are the same, such as: algorithm foundation, common data structures, and enterprise programming specifications. Master common data structures and practical algorithms; develop good enterprise-level programming habits.

The third step: After mastering the basics of the Java language, the next step is the common features of object-oriented languages: Java object-oriented and object-oriented features: encapsulation, inheritance, polymorphism, etc. Master the basic principles of object-oriented programming and its significance in programming practice; master the basic implementation principles of object-oriented programming in Java.

Step 4: JDK core API language core package, exception handling, common tool kits, and collection framework. Proficient in JDK core API programming technology; understand API design principles; have the ability to read API documents proficiently; JavaSE core exception handling, multi-threading basics, IO system, network programming, Swing components, JVM performance tuning (JVM memory structure analysis, GC analysis and tuning, JVM memory parameter optimization), Java generics, and new JDK features. Proficient in the core content of JavaSE, especially IO and multi-threading; initially possess the ability of object-oriented design and programming; master basic JVM optimization strategies. XML XML syntax, XML parsing (SAX, DOM), Dom4j component, Digester component. Proficient in XML syntax rules; understand DOM model; familiar with various XML parsing methods in Java.

The fifth step: SQL language SQL statement foundation and improvement, SQL statement tuning. Proficient in SQL statements; master certain database query skills and SQL statement optimization skills. Oracle database development Oracle architecture and system management, Oracle database advanced programming, database design basics. Master Oracle architecture and core programming technology

Step 6: Connect to the database: JDBC JDBC core API (Connection, Statement, ResultSet), JDBC optimization technology (caching technology, batch processing technology, connection pool technology). Understand the design principles of JDBC as a specification; be proficient in the JDBC API; have the ability to use JDBC to efficiently access the database.

Step 7: Basic software processes and software activities of software engineering; basic principles and document specifications of requirements design, outline design, detailed design; basic concepts and necessity of configuration management; basic operations of CVS; introduction to Ant to understand the software General concepts of process and basic software activities; understand the meaning of iteration; master common configuration management and deployment tools such as Ant and CVS.

Step 8: OOAD and design patterns Basic object-oriented design principles, factory pattern, strategy pattern, adapter pattern, proxy pattern, etc., facade pattern. Understand the general principles of object-oriented design; understand the meaning of reuse; master common design patterns.

Step 9: HTML/CSS HTML basic document structure, master basic CSS syntax, about HTML document blocks, links, lists, tables, forms, etc. Master the basic principles of HTML; master various CSS selectors and common style settings; be proficient in using common HTML elements.

JavaScript core JavaScript language foundation (data types, functions, objects, closures), Java DOM programming, event model, JavaScript object-oriented programming. Deeply understand the principles of JavaScript language; be proficient in using JavaScript to program HTMLDOM; be proficient in JavaScript object encapsulation skills, laying a solid foundation for subsequent JavaScript learning.

　Servlet/JSP Servlet life cycle and Servlet server, Tomcat deployment configuration, JSP syntax, custom tags, JSTL and EL expressions, new JSP features, Java Web design patterns. Thoroughly understand the core principles of Servlet; be proficient in ServletAPI; thoroughly understand the working principle of JSP engine; thoroughly understand the principle of tag library; be familiar with common Java Web design patterns; lay a solid theoretical foundation for subsequent Java Web development.

Step 10: Ajax Ajax basics, XHR objects, Ajax design patterns, and JSON technology. Master the basic communication principles of Ajax; master Ajax data rules based on XML and JSON.

Step 11: JavaScript framework JQuery, JQuery plug-in, DWR. Master the core API of JQuery; understand the basic design principles of JQuery; understand various JQuery plug-ins; master the basic principles and application skills of DWR.

Step 12: Learn the three major ssh frameworks. This is the framework model for practical application in enterprises:

　1. Struts 2.1.6 Struts2 core control process, Ognl, Action, Interceptor, Result, FreeMarker, Struts2 tag library, Struts2 extension, Struts2 application skills (input validation, message internationalization, file upload and download, prevention of duplication submission, etc.). Proficient in the core elements of Struts2, especially Interceptor and Result; master the Struts2 UI components based on template technology; master the data sharing method based on Ognl, master various customization and expansion methods of Struts2; master the Web development skills based on Struts2.

　2. Hibernate 3.2.1 ORM concepts, Hibernate core API, Hibernate entity mapping technology, Hibernate relationship mapping skills, HQL query, OSCache and Hibernate caching technology. Focus on mastering Hibernate's various association mapping techniques and their practical background, so as to use the appropriate association method at the right time; master various Hibernate query techniques and optimization techniques.

　3. Spring 2.5 Spring Ioc basics, Ioc injection skills, advanced object assembly (automatic assembly, template assembly, component scanning characteristics, FactoryBean, object life cycle), Spring AOP principles, AspectJ, Spring JDBC support, Spring Transaction and security management; Spring integrates Hibernate, Spring integrates Struts, and an introduction to Spring MVC. Have an in-depth understanding of the basic principles and implementation methods of Ioc and AOP; be proficient in SpringIoc and AOP implementation methods; be proficient in Spring transaction management; be proficient in the integration technology of Spring and other components.

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