Shulou(Shulou.com)06/02 Report--

In this issue, Xiaobian will bring you about Java common words, the article is rich in content and analyzed and described from a professional perspective. After reading this article, I hope you can gain something.

A general introduction to Java would be incomplete without an introduction to Java idioms. Although portability and security were the driving forces behind Java, other factors played an important role in shaping the Java language. Members of the Java Design and Development Group summarized these key factors and called them Java jargon. Let's look at what other features mean.

I. Simple

Java is designed to be both easy to learn and easy to use for professional programmers. Assuming you have programming experience, you will not find Java difficult to master. If you already understand the basic concepts of object-oriented programming, learning Java will be easier. If you're an experienced C++ programmer, that's great, learning Java is a breeze. Because Java inherits C/C++ syntax and many of C++'s object-oriented features, most programmers don't find it too difficult to learn Java. In addition, many confusing concepts in C++ are either discarded by Java or implemented in a clearer, more understandable way.

In addition to its similarity to C/C++, Java has another property that makes it easier to learn: designers strive to avoid surprising features in Java. In Java, you are rarely told exactly how to complete a particular task.

II. Object Oriented

Although influenced by its predecessors, Java was not designed to be compatible with source code from other languages. This allows the Java development team the freedom to start from scratch. One result of this is that the Java language can approach objects more directly, more easily, and more practically. By borrowing from the advantages of object-oriented software in recent decades, Java managed to strike a balance between the pure evolutionist argument that everything is an object and the pragmatist argument that objects are not discussed. Java's object model is simple and easy to extend, and it maintains high performance for simple data types, such as integers, but not objects.

III. Health

The multiplatform environment of the World Wide Web makes it particularly demanding for programs to execute reliably on many systems. Thus, creating robust programs is a high priority when designing Java. To achieve reliability, Java constrains you in some key ways, forcing you to spot errors early in the development process. Java also frees you from many of the most common problems that cause programming errors. Because Java is a strictly typed language, it inspects code not only at compile time, but also at run time. In fact, many of the hard-to-reproduce, hard-to-track errors that are encountered frequently at runtime are almost impossible to generate in Java. Remember that making programs run predictably in different runtime environments is a key feature of Java.

To better understand how Java is robust, let's consider two main causes of program failure: memory management errors and misoperation-induced exceptions (i.e., runtime errors). Memory management is a difficult and tedious task in traditional programming environments. For example, in C/C++, programmers must manually allocate and free all dynamic memory. This can sometimes cause problems because the programmer may forget to free up memory that was originally allocated or free up memory that is being used by other parts of the program. Java can eliminate these problems fundamentally by managing memory allocation and deallocation for you (in fact, deallocation is completely automatic because Java provides automatic garbage collection for idle objects). In a traditional environment, exceptions can often be caused by divide-by-zero or file-not-found conditions that we must manage with a plethora of instructions that are difficult to understand. Java solves this problem by providing object-oriented exception handling mechanisms. With a well-written Java program, all runtime errors can and should be managed by your program itself.

IV. Multithreading

One of the goals of Java design was to meet people's need to create interactive web applications. For this reason, Java supports multithreaded programming, so that applications you write in Java can perform multiple tasks simultaneously. The Java runtime system has proven solutions for multithreaded synchronization that enable you to create interactive systems that run smoothly. Java's multithreading mechanism is very easy to use, so you only need to pay attention to the implementation of the program details, do not worry about the background multitasking system.

V. Structural neutrality

A major concern for Java designers is the persistence and portability of program code. One of the main problems programmers face is that there is no guarantee that programs written today will run smoothly on the same machine tomorrow. Operating system upgrades, processor upgrades, and changes in core system resources can cause programs to stop running. Java designers have tried to solve this problem in many ways, and the Java Virtual Machine (JVM) is one of them. Their goal was to "write a program once, and it will always run anywhere, anytime." Java achieves this goal to a large extent.

VI. Interpretability and high performance

As mentioned earlier, Java can produce programs that run across platforms through an intermediate process of compiling programs into Java bytecode. Bytecode can be interpreted and executed on any system that provides a Java Virtual Machine (JVM). Many of the earlier attempts to solve cross-platform solutions were performance intensive. Other interpretive execution language systems, such as BASIC, Tcl, and PERL, have performance flaws that cannot be overcome. Java, however, runs smoothly on very low-end CPUs. As explained earlier, Java is indeed an interpreted language, and Java bytecode is carefully designed so that it is easy to convert bytecode directly into high-performance native code using JIT compilation techniques. The Java runtime system provides this feature while still being platform independent, so "efficient and cross-platform" is no longer contradictory to Java.

VII. Distribution

Java is designed for the distributed environment of the Internet because it handles TCP/IP protocols. In fact, there is not much difference between accessing a resource via a URL address and accessing a file directly. The original version of Java (Oak) included built-in intra-address-space messaging. This allows objects located on two different computers to execute processes remotely. Java recently released a package called Remote Method Invocation (RMI), a feature that brings client/server programming to an unparalleled level of abstraction.

VIII. Developments

Java programs come with a variety of run-time type information for checking and resolving object access problems at runtime. This makes it possible to dynamically link code in a safe and efficient way, and is important for robustness in the applet environment because small pieces of code within bytecode can be dynamically updated in runtime systems.

The above is what Java common words are shared by Xiaobian. If you happen to have similar doubts, you may wish to refer to the above analysis for understanding. If you want to know more about it, please pay attention to the industry information channel.

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