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This article focuses on "what are the features and advantages of Java programming language". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what are the features and advantages of Java programming language.

1 preface

Java is a legend in the development of computer software in the past 10 years, and its status in the hearts of many developers can be described as "admiring". Unlike some other computer languages that gradually weaken with the passage of time, Java becomes more powerful with the passage of time.

Java has leapt to the forefront of Internet programming since its first release. Each subsequent version further strengthens this position. Today, Java is still the best choice for developing Web-based applications. In addition, Java is also the driver of smartphone change, and Android is programmed in the Java language.

2 Java language features

Java is an object-oriented programming language, which not only absorbs the advantages of C++ language, but also abandons the concepts such as multi-inheritance and pointers that are difficult to understand in C++, but also adds a garbage collection mechanism to free up unused memory space and solve the trouble of managing memory space.

2.1 simplicity

The syntax of Java language is simple and clear, easy to master, and it is a pure object-oriented language.

The simplicity of the Java language is mainly reflected in the following aspects:

The grammatical rules are similar to C++. In a sense, the Java language is transformed from the C and C++ languages, so the syntax of the Java language can be easily mastered by C _ Java + programmers.

The Java language simplifies and improves C++. For example, Java replaces multiple inheritance with interfaces and removes pointers, because pointers and multiple inheritance often complicate programs. The Java language also simplifies the resource release management of programmers through automatic garbage collection.

Java provides a wealth of class libraries, API documentation, and third-party development packages, as well as a large number of Java-based open source projects. JDK (Java developer's Toolkit) has been opened so that readers can improve their programming level by analyzing the source code of the project.

2.2 object-oriented

Object-oriented is not only the foundation of Java language, but also an important feature of Java language. It is a pure object-oriented programming language. Java advocates that everything is an object, and individual data and functions cannot be defined outside the class in the syntax, that is to say, the outermost data type of the Java language is the object, and all elements are accessed through the class and object.

2.3 Architectural neutrality

The solution of Java system to solve the problem of binary distribution is a "binary code format", which is independent of hardware architecture, operating system interface and window system. The format of this system-independent binary is architecture-neutral. If the Java runtime platform is available for a given hardware and software environment, applications written in Java can be executed in that environment without any special migration work for the application.

2.4 Portable

Java language programs are portable to any system that has been implemented by the Java interpreter and runtime system.

2.5 robustness

The Java compiler uses extensive and rigorous compile-time checking to detect syntax-related errors early before the program is deployed.

2.6 Security

Security can be divided into four levels, namely, language-level security, compile-time security, runtime security, and executable code security. Language-level security means that the data structure of Java is a complete object, and these encapsulated data types are secure. The Java language and semantics should be checked during compilation to ensure that each variable corresponds to a corresponding value, and the Java class is generated after compilation. The runtime Java class needs to be loaded by the class loader and verified by the bytecode verifier before it can be run. When the Java class is used on the network, its permissions are set to ensure the security of the accessed users.

2.7 High performance

Java is a language that compiles and then interprets, so it is not as fast as a fully compiled language. But performance is critical in some cases, and to support these situations, Java designers have created a "just in time" compiler that translates Java bytecode into machine code for a particular CPU (central processing unit) at run time, that is, it is fully compiled. The Java bytecode format is designed with the needs of these "just-in-time" compilers in mind, so the process of generating machine code is quite simple, and it produces fairly good code.

Java is indeed high-performance compared to those interpreted high-level scripting languages. In fact, the running speed of Java is getting closer and closer to that of C++ with the development of JIT (Just-In-Time) compiler technology.

2.8 explanatory type

Java programs are compiled into bytecode files when running on the Java platform, and can then be run on operating systems with Java environments. When the file is run, the Java interpreter interprets and executes the bytecode, and the classes that need to be added during the execution are loaded into the runtime during the connection phase.

2.9 Thread type

Java language is multithreaded, which is also a major feature of Java language. Multithreading mechanism enables applications to execute multiple tasks in parallel at the same time. These corresponding synchronization mechanisms can ensure that different threads can share data correctly. The multithreading mechanism makes the program more interactive and real-time.

2.10 dynamic type

Java is more adaptable to the growing environment than C and C++ in many ways, dynamically adjusting methods and adding variables in the library, while the client does not need any changes. Dynamic adjustment in Java is very simple and straightforward.

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