Java

1. Basic characteristics Cross platform: The core concept of Java is “Write Once, Run Everywhere” (WORA), which means that Java code written can run on any platform that supports the Java Virtual Machine (JVM) without recompiling Object oriented: Java is an object-oriented language, and all code must be defined in classes, which makes the program structure clear and easy to manage. It supports basic object-oriented concepts such as encapsulation, inheritance, and polymorphism. Security: Java provides powerful security mechanisms, including class loaders and bytecode validators, to ensure that code does not cause damage to the system during execution 2. Application Fields Mobile applications: Java is the main language for Android development, and many popular mobile applications such as Spotify and Cash App are written in Java Enterprise software: Java is widely used for developing large enterprise level applications, especially in the financial and telecommunications industries, and is favored for its stability and scalability Web applications: Many well-known websites, such as Twitter and LinkedIn, use Java to build their backend services and leverage its powerful frameworks, such as Spring, to handle complex business logic Internet of Things (IoT): With the development of IoT, Java is also being used to develop applications for smart devices and sensors