The style of Java language is very similar to C language and C language. It is a pure object-oriented language. It inherits the core object-oriented technology of C language, but abandons some shortcomings of C, such as pointers that easily cause errors. As well as multiple inheritance, etc., it also adds a garbage collection mechanism to release unused memory space and solve the trouble of managing memory space.
Java language is a distributed object-oriented language, which is object-oriented, platform independent, simplicity, interpreted execution, multi-threading, security, etc. There are many features, these features are introduced one by one below. (Recommended learning: java course)
1. Object-oriented
Java is an object-oriented language that uses classes in objects , objects, inheritance, encapsulation, polymorphism, interfaces, packages, etc. are all well supported. For simplicity, Java only supports single inheritance between classes, but multiple inheritance can be implemented using interfaces. To develop programs using Java language, you need to adopt object-oriented thinking to design programs and write code.
2. Platform independence
The specific manifestation of platform independence is that Java is a "Write Once, Run any Where" language , so programs written in Java language have good portability, and it is Java's virtual machine mechanism that ensures this. After the introduction of virtual machines, the Java language does not need to be recompiled to run on different platforms.
The Java language uses the Java virtual machine mechanism to shield relevant information about specific platforms, so that programs compiled in the Java language only need to generate target code on the virtual machine and can run on multiple platforms without modification.
3. Simplicity
The syntax of Java language is very similar to C language and C language, making it easy for many programmers to learn. For Java, it abandons many features that are difficult to understand in C, such as operator overloading and multiple inheritance. Moreover, the Java language does not use pointers and adds a garbage collection mechanism, which solves the problem that programmers need to manage memory. Makes programming easier.
4. Explanation and execution
When a Java program is run on the Java platform, it will be compiled into a bytecode file, which can then be run on an operating system with a Java environment. When running the file, the Java interpreter interprets and executes these bytecodes, and the classes that need to be added during the execution are loaded into the running environment during the connection phase.
5. Multi-threading
The Java language is multi-threaded, which is also a major feature of the Java language. It must be created by the Thread class and its subclasses . Java supports multiple threads executing simultaneously and provides a synchronization mechanism between multiple threads. Each thread has its own run() method, and the method to be executed is written in the run() method body.
6. Distributed
Java language supports the development of Internet applications. Among the basic application programming interfaces of Java, there is a network application programming interface, which provides network Class libraries for application programming, including URL, URLConnection, Socket, etc. Java's RIM mechanism is also an important means of developing distributed applications.
7. Robustness
Java’s strong typing mechanism, exception handling, garbage collection mechanism, etc. are all important guarantees for Java’s robustness. Discarding pointers is a major advancement in Java. In addition, Java's exception mechanism is also a major manifestation of robustness.
8. High performance
Java’s high performance is mainly compared to other high-level scripting languages. With the development of JIT (Just in Time), Java’s The running speed is also getting higher and higher.
9. Security
Java is usually used in a network environment. For this reason, Java provides a security mechanism to prevent malicious code attacks. In addition to the many security features of the Java language, Java also adds a security prevention mechanism to classes downloaded through the network, allocates different name spaces to prevent local classes of the same name from being replaced, and includes a security management mechanism.
The many features of the Java language make it occupy a large market share among many programming languages. The Java language's support for objects and powerful API make programming work easier and faster, greatly reducing the time required to program. development costs. Java's "write once, execute anywhere" is one of its advantages that attracts many businesses and programmers.
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