Many Android applications are developed by Java programmers and developers. Although Android uses different JVMs and different encapsulation methods, the code is still written in Java language. A considerable number of mobile phones support JAVA games, which makes many non-programmers understand JAVA.
2. Server programs applied to the financial industry
Java is widely used in financial services, and many third-party trading systems, banks and financial institutions choose to develop with Java because it is relatively safe [39]. Large multinational investment banks use Java to write foreground and background electronic trading systems, settlement and confirmation systems, data processing projects and other projects. In most cases, Java is used for server-side development, but most of them have no front end. They usually receive data from one server (upper layer), process it and send it to another processing system (lower layer).
3. Website (the host station of the World Wide Web)
Java occupies a certain position in the field of e-commerce and website development. Developers can use many different frameworks to create web projects, such as SpringMVC, Struts2.0 and frameworks. Even simple servlet, JSPs and struts-based websites are often used in government projects. For example, the websites of different departments such as medical care, insurance, education and national defense are all developed based on Java.
4. Embedding fields
Java has a great development space in the embedded field. On this platform, you only need 130KB to use Java technology (on smart cards or sensors).
5. Big data technology
Many big data processing technologies, such as Hadoop, are Java-based, such as Apache's Java-based HBase and Accumulo, and ElasticSearchas.
6. Space for high-frequency trading
Java platform improves the characteristics of this platform, even if compiled, it can transmit data like C++. It is for this reason that Java has become the language for programmers to write trading platforms, because although its performance is not as good as C++, developers can avoid problems such as security, portability and maintainability.
7. Scientific application
Java is a good choice in scientific applications including natural language processing. The main reason is that Java is superior to C++ or other languages in security, portability, maintainability and concurrency of other high-level languages.