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This article mainly shows you "what are the eight advantages of JAVA". The content is simple and clear. I hope it can help you solve your doubts. Let the editor lead you to study and learn this article "what are the eight advantages of JAVA?"

Eight advantages of Java

Java has the characteristics of simple, object-oriented, stable, platform-independent, interpretive, multithreaded, dynamic and so on. It is a necessary tool for IT people.

Why do we need to learn java? why does java attract so much attention? Is it. Yes! This is the root of java:

1. Java is one of the most widely used network programming languages at present. It has the characteristics of simple, object-oriented, stable, platform-independent, interpretive, multithreaded, dynamic and so on.

two。 Simple Java language simplicity means that the language is easy to learn and easy to use. Don't misinterpret simplicity as a dry language. You may agree that English is easier to learn than Aliber. However, this does not mean that English can not express rich content and profound thoughts. Many works of the Ruobel Prize are written in English. If you have studied the C++ language, you will feel that Java looks familiar, because the syntax of many basic sentences in Java is the same as C++, such as common loops, control statements, and so on, almost the same as C++, but do not misunderstand that Java is an enhanced version of C++, Java and C++ are two completely different languages, they have their own advantages and will coexist for a long time, Java language and C++ language have become software developers should master the language. If Java is simpler than C++ in terms of language simplicity, many of the easily confused concepts in C++ are either abandoned by Java or implemented in a way that is clearer and easier to understand. For example, Java no longer has the concept of pointers.

3. Object-oriented object-based programming is more in line with people's mode of thinking and makes it easier for people to write programs. In real life, we deal with the object all the time. The pen we use, the bike we ride, the bus we take, etc. The trucks, buses and cars we often see all involve the following important physical quantities: the number of people that can be carried, the running speed, the power of the engine, fuel consumption, self-weight, the number of wheels and so on. In addition, there are several important functions such as acceleration, deceleration, braking, turning and so on. We can also call these functions the methods they have, and physical quantities are their state descriptions. They cannot be well described in terms of physical quantities or functions alone. In real life, we use these common attributes and functions to give a concept of motor vehicles. A specific car is an instance object of a motor vehicle class. Java language, like other object-oriented languages, introduces the concept of class, which is a template for creating objects, which contains the state description of the created objects and the definition of methods.

4. Platform-independent is the biggest advantage of Java language. One of the major problems faced by programs written in other languages is that changes in operating systems, processor upgrades, and changes in core system resources may cause programs to go wrong or fail to run. Java's virtual machine successfully solved this problem. The program written by Java can run correctly on any computer with Java virtual machine JVM installed. Sun has achieved its goal of "write once, run everywhere".

5. Interpretive type, we know that languages such as CMagneCraft + can only compile specific CPU chips to generate machine code, and the operation of this code is related to a specific CUP. For example, in C language, we have all encountered a problem like the following: the value of the int variable is 10, so what is the output of the following code? printf ("% dforce% d", x _ mae _ XQ _ 1). If the above statements are evaluated from left to right, the result is 10J11, but some machines will calculate from right to left. Java is not compiled for specific CPU chips. Instead, the program is compiled into an "intermediate code" called bytecode. Bytecode is a file that is very close to machine code and can be interpreted and executed on any system that provides the Java virtual machine JVM. Java is designed to interpret and execute programs, that is, translate one sentence and execute one sentence without generating the entire machine code program. If there are no errors in the translation process, it will continue until it is finished, otherwise it will stop at the error. The same program, if interpreted, usually runs slower than machine code that is compiled into executable. However, for Java, there is not much difference between the two. After careful design, Java bytecode can be easily converted directly into high-performance native machine code using JIT just-in-time compilation technology. Sun has provided such a bytecode compiler, JIT (Just In Time), which is part of the Java virtual machine, in the Java 2 distribution. Java operating system still has platform independence while providing JIT, so it is no longer contradictory for Java to be "efficient and cross-platform". If the Java program is compared to "Chinese", the bytecode is equivalent to "Esperanto". Esperanto is not related to a specific "country". As long as the "country" provides "translation", Esperanto can be quickly translated into the local language.

6. One of the features of multithreaded Java is the built-in support for multithreading. Multithreading allows multiple tasks to be completed at the same time. In fact, multithreading gives people the illusion that multiple tasks are executing at the same time, because the current computer processor can only execute one thread at a time, but the processor can quickly switch between different threads. because the speed of the processor is so fast that it far exceeds the speed at which people receive information, it gives the impression that multiple tasks are being executed at the same time. C++ has no built-in multithreading mechanism, so it is necessary to call the multithreading function of the operating system to design multithreaded programs.

7. Security when you are ready to download a program from the network, your biggest concern is that the program contains malicious code, such as trying to read or delete some important files on the local computer, or even a virus program. When you use a browser that supports Java, you can safely run the Java applet Java Applet. You don't have to worry about virus infection and malicious attempts. Java applets will be limited to the Java running environment and will not be allowed to access other parts of the computer.

8. The basic unit of dynamic Java programs is classes, some classes are written by themselves, some are introduced from class libraries, and classes are loaded dynamically at run time, which enables Java to maintain programs and class libraries dynamically in a distributed environment, unlike C++, when the corresponding programs have to be modified and compiled after their class libraries are upgraded.

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