With the development of the Internet, Java has risen rapidly and has become one of the most popular programming languages. Many people have seen the bright prospects of this industry and are flocking to this industry. , so many people want to learn this java language well. So the editor below will tell you what knowledge you need to learn for Java web development. I hope it will be of some help to you.
1. HTML CSS DIV will be used in the front end. As a developer, you should at least be able to simply write some pages. This is the basis that many programming languages need to understand.
2. JAVASCRIPT, you need this if you want to use some special effects, but you don’t need to be very proficient. When you need to use JS, you can use Jquery proxy. Jquery is easy to learn and very useful. JS framework, he can easily complete seemingly complex and gorgeous effects.
3.Ajax, front-end asynchronous interaction technology, is worth studying
4.JSP, Servlet, Javabean, so far, it is no longer recommended to embed JAVA code in JSP, so it is only used as a view layer Use, embed tags such as JSTL and Struts2 tag libraries to become dynamic pages. Servlets should be focused on learning, including filters, listeners, etc. These are the underlying foundation and principles of the current Struts2 or future WEB framework.
5.Strut2 Hibernate (or JPA) Spring, a very popular development framework today. It is actually very easy to get started, but the key is to understand the principles.
6. Web Service technology, which enables different applications running on different machines to exchange data or integrate with each other without the need for additional, specialized third-party software or hardware. Applications implemented according to Web Service specifications can exchange data with each other regardless of the language, platform or internal protocol they use.
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Different JVM implementations can provide platform independence, but their performance is slightly different. 1. OracleHotSpot and OpenJDKJVM perform similarly in platform independence, but OpenJDK may require additional configuration. 2. IBMJ9JVM performs optimization on specific operating systems. 3. GraalVM supports multiple languages and requires additional configuration. 4. AzulZingJVM requires specific platform adjustments.

Platform independence reduces development costs and shortens development time by running the same set of code on multiple operating systems. Specifically, it is manifested as: 1. Reduce development time, only one set of code is required; 2. Reduce maintenance costs and unify the testing process; 3. Quick iteration and team collaboration to simplify the deployment process.

Java'splatformindependencefacilitatescodereusebyallowingbytecodetorunonanyplatformwithaJVM.1)Developerscanwritecodeonceforconsistentbehavioracrossplatforms.2)Maintenanceisreducedascodedoesn'tneedrewriting.3)Librariesandframeworkscanbesharedacrossproj

To solve platform-specific problems in Java applications, you can take the following steps: 1. Use Java's System class to view system properties to understand the running environment. 2. Use the File class or java.nio.file package to process file paths. 3. Load the local library according to operating system conditions. 4. Use VisualVM or JProfiler to optimize cross-platform performance. 5. Ensure that the test environment is consistent with the production environment through Docker containerization. 6. Use GitHubActions to perform automated testing on multiple platforms. These methods help to effectively solve platform-specific problems in Java applications.

The class loader ensures the consistency and compatibility of Java programs on different platforms through unified class file format, dynamic loading, parent delegation model and platform-independent bytecode, and achieves platform independence.

The code generated by the Java compiler is platform-independent, but the code that is ultimately executed is platform-specific. 1. Java source code is compiled into platform-independent bytecode. 2. The JVM converts bytecode into machine code for a specific platform, ensuring cross-platform operation but performance may be different.

Multithreading is important in modern programming because it can improve program responsiveness and resource utilization and handle complex concurrent tasks. JVM ensures the consistency and efficiency of multithreads on different operating systems through thread mapping, scheduling mechanism and synchronization lock mechanism.


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