Top Ten Features of Java Language (A Must for Beginners)

Java language is simple

The syntax of Java language is very close to C language and C language. In a sense, it It evolved from C and C, making it easy for most programmers to learn and use.

has been simplified and improved to a certain extent for C, such as using interfaces to replace complex multiple inheritance and canceling pointers. It also greatly simplifies the programmer's resource release management by implementing an automatic garbage collection mechanism. Work.

Provides a wealth of class libraries and API documents, as well as third-party development kits and toolkits, as well as a large number of Java-based open source projects to help programmers learn from reference. JDK is one of the open source codes. Readers can improve their programming skills by analyzing the source code of the project.

The Java language is object-oriented

Object-oriented is the foundation of the Java language and an important feature of the Java language. Object-oriented refers to using objects as the basic unit, including properties and methods. The state of an object is expressed by attributes, and the behavior of an object is expressed by methods.

Object-oriented technology makes application development simple and easy to use, saving code. In short, the Java language is a purely object-oriented programming language.

The Java language is distributed

Distribution mainly includes two aspects, namely operation distribution and data distribution. Operation distribution refers to the distribution of data across multiple different Related operations are arranged on the host. The data distribution is to store the data on different hosts in multiple networks. The network objects are accessed with the help of URL (Uniform Resource Locator). The access method is similar to accessing the local system.

The Java language has a powerful, easy-to-use network capability, which is very suitable for distributed computing programs.

Java language supports the development of Internet applications. Among the basic Java application programming interfaces, there is a network application programming interface (java.net), which provides a class library for network application programming, including URL, URLConnection , Socket, ServerSocket, etc. Java's RMI (Remote Method Activation) mechanism is also an important means of developing distributed applications.

The Java language is multi-threaded

The multi-threading mechanism enables applications to perform multiple tasks in parallel at the same time. The Java language provides a synchronization mechanism between multiple threads. These corresponding synchronization mechanisms can ensure that different threads can correctly share data. The multi-threading mechanism makes the program more interactive and real-time.

The Java language is high-performance

Java is a language that is compiled first and then interpreted, so it is not as fast as a fully compiled language. But there are situations where performance is critical. To support these situations, Java designers created a "just-in-time" compiler, which translates Java bytecode into machine code for a specific CPU (central processing unit) at runtime, as well. That is to achieve full compilation.

The Java bytecode format was designed with the needs of these "just-in-time" compilers in mind, so the process of generating machine code is fairly simple, and it produces pretty good code.

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

Java language is cross-platform

The so-called cross-platform means that the software can work normally in any computer environment without being constrained by computer hardware and operating systems. run. This is the trend of software development and the goal pursued by programmers.

The reason why I say this is because there are many types of computer hardware and different operating systems. Different users and companies have their own different computer environment preferences, and software must function properly in these different environments. To run, it needs to be independent of these platforms.

In the Java language, the virtual machine that comes with Java has achieved cross-platform very well. The binary bytecode generated after Java source code is compiled is platform-independent. When the Java virtual machine executes the bytecode, it interprets the bytecode into machine instructions for execution on the specific platform.

This is why Java can Write once, run anywhere (compile once, run anywhere). The Java virtual machine provides a barrier from bytecode to the underlying hardware platform and operating system, making the Java language cross-platform.

Java language is portable

Portability comes from cross-platform nature. In addition, Java also strictly stipulates the length of each basic data type. The Java system itself is also highly portable. The Java compiler is implemented in Java, and the Java running environment is implemented in ANSI C.

Java language is safe

The syntax similar to pointers and content release in C language is deleted in Java language, which effectively avoids illegal memory operations. The code must be verified before it can run, so it is impossible for unauthorized Java programs to harm the system platform

The biggest advantage is that Java can write anti-virus and repairable systems. Java is usually Used in network environments, Java provides a security mechanism to prevent malicious code attacks, thereby improving system security.

The Java language is robust

The strong typing mechanism, exception handling, and automatic garbage collection of the Java language are important guarantees for the robustness of Java programs.

Discarding pointers is a wise choice for Java. Java's security checking mechanism makes Java more robust.

The Java language is dynamic

One of the design goals of the Java language is to adapt to dynamically changing environments. The classes required by Java programs can be dynamically loaded into the running environment, and the required classes can also be loaded through the network, which is also conducive to software upgrades.

Classes in Java have a run-time representation and can perform run-time type checking.

Thank you for reading, I hope you can understand the Java language after reading this.

This article is reproduced from: https://thinkwon.blog.csdn.net/article/details/94354013

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