Making statements based on opinion; back them up with references or personal experience. Java is free, simple, object-oriented, distributed, supports multithreading and offers multimedia and network support. Each of the preceding buzzwords is explained in The Java Language Environment, a white paper written by James Gosling and Henry McGilton. Worse yet, there were no standards for equipment external to the processor such as core-memory and drum memory. Once the source code has been converted to J-code, the Java interpreter can't tell what programming language created the J-code it is executing. Then what is the difference between C portability and Java's portability? The more portable languages came up with a solution to the problem of different machine languages: an intermediate executable language (i.e. In practice portability is mainly about libraries. They produced concepts such as ASCII, RS232, HPGL, SCSI, and etc. programs written for one type of computer or operating system can be run on another type of computer or operating system.". In the Java programming language, all source code is first written in plain text files ending with the .java extension. Java Editions or we can say the platform is a collection of programs which helps to develop and run the programs that are written in Java Programming language. Please clear my confusion. Conversely, C++ allows functions and data to be external to any class. Unfortunately, the features that make Java so portable have a downside. Java provides portability by compiling the byte codes for the Java Virtual Machine, which is then interpreted on each platform by the run-time environment Compilation of code. While the C standard is so vauge hardware-wise, that it barely assumes that the program will run on any form of hardware. So the thinkers created new languages that would have standardized graphics capabilities (along with other features). On the contrary, in java there is a difference in semantics of primitive and object types. The simplicity and portability features of Java make sure that enterprises would not face any problem while designing apps related to hardware, network, or the operating system. Brian Smith. went throgh a couple of books trying to understand all these JAVA jargons. Sometimes developers will be able to work around this by extending the AWT; other times they will not. In the case of Java, it is the magic of Bytecode that makes it platform independent. Portability in java means java programs can be run on any pc independant of hardware, OS where JVM (java virtual machine) is installed. Unlike C and C++, Java has defined sizes and endianism for the atomic types, as well as defined floating-point behavior. At the same time, the thinkers were becoming lazy and wanted more (machine) code written with less typing and effort. Those source files are then compiled into .class files by the javac compiler. Java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. Podcast 291: Why developers are demanding more ethics in tech, “Question closed” notifications experiment results and graduation, MAINTENANCE WARNING: Possible downtime early morning Dec 2, 4, and 9 UTC…. Some terminals had 132 character widths while others had 80. Java is a widely used programming language expressly designed for use in the distributed environment of the internet. Thus, not all source code is trivially portable between different systems. Java assumes a 32-bit machine with 8-bit bytes and IEEE754 floating-point math. Another approach, not followed by Java, is to pick a single OS/GUI as the master and provide wrapper libraries supporting this master OS/GUI on all machines to which you wish to port. Portability ensures that Java can be implemented on a wide array of platforms like desktops, mobile devices, severs and many more. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. But C/C++ compilers are expensive to build and also there could be differences between platforms which causes inconsistencies in the program execution. Machines that don't fit this model, including 8-bit microcontrollers and Cray supercomputers, can't run Java efficiently. The benefit to compiling programs (in any language) to J-code is that the same code runs on different families of CPUs. For this reason, we should expect C and C++ to be used on more platforms than the Java language. The big deal in java is, that the language itself brings a lot of standard libarary functions with it, so you rarely need access to the operating systems api. Object oriented Java is true (pure) object oriented language because object is the outer most level of As a programming language Java provides the simplest and most familiar form of portability -- source code portability. What conclusion to be drawn from no difference in generated assembly from 2 rather different programs? 2.1 Overview of Enterprise Applications. Java offers higher cross- functionality and portability as programs written in one platform can run across desktops, mobiles, embedded systems. In fact, J-code-hosted interpreters have been written for several languages, including BASIC, Forth, Lisp, and Scheme, and it is almost certain that implementations of other languages will emit J-code in the future. In the Java programming language, all source code is first written in plain text files ending with the .java extension. They judge the software system based on Responsiveness, Usability, Security, Portability and other non-functional standards that are critical to the success of the software system. In those cases where desired functionality is unattainable with workarounds, developers most likely will choose to write non-portable code. Peripherals, such as display terminals, printers and external communications were not standard. Today, most major operating systems, including OS/2, MacOS, Windows 95/NT, and Novell Netware, either have, or are expected to have, built-in support for J-code programs. Compiler in Java is written in ANSI C with a clean portability boundary, which is a POSIX subset. What is serialization? can we say that C is also a portable language like java? History of Java. Can Java applications run on phones (at least android) AND Windows? http://wiki.answers.com/Q/What_is_portability#ixzz1EsuKJIEs. No matter what, there will have to be something that is platform-specific. @Summer It's possible for code that doesn't use operating system specific libraries. The Java compiler, javac, outputs bytecodes and puts them into a .class file. C doesn't (guarantee to) have a GUI, Java doesn't (guaranteed to) have a steady supply of engines or the means to manipulate them into position. But making such GUIs feel native on all platforms is hard and usually requires additional work even with cross platform toolkits(and many GUI cross platform GUI toolkits feel foreign no matter how much work you put in). Instead of producing output for each different CPU family on which the Java program is intended to run, the current Java compilers produce object code (called J-code) for a CPU that does not yet exist. The advantage to this approach is that mapping the common functionality to the native OS/GUI is fairly easy and, with care, can provide applications that work as expected on most OSs/GUIs. These programs are generally considered to be fast and secure, have a higher degree of portability and low maintenance. In short, although the syntax of C and C++ is well defined, the semantics are not. JVM,JRE & PORTABILITY . By this time, core functionality of graphics was changing less and becoming standardized. Java is designed for the distributed environment of the internet. Java being fast, reliable and robust is useful for many applications to manipulate and study Big Data. Java’s important feature is portability. Explanation of the definition of interface inheritance as described in GoF book. "The programs written in C are portable i.e. Explain how Java accomplishes portability. Portability has usually meant some work when moving an application program to another operating system. Honeywell) to another (e.g. Some languages and environments are more portable than others. Java guarantees identical program behavior on different platforms. "The programs written in C are portable i.e. This adds to an important feature in the JAVA language termed as portability.Every system has its own JVM which gets installed automatically when the jdk software is installed. But so can Ada95. On the upside, portable software allows them to support more platforms, which leads to a larger base of potential customers. Java code is portable while C++ does not provide portability. All function and data exist within classes in Java. Read more: http://wiki.answers.com/Q/What_is_portability#ixzz1EsuKJIEs. Just like the JVM presents a virtual CPU, the Java libraries present a virtual OS/GUI. Please read our previous article where we discussed Parallel Programming in Java.At the end of this article, you will understand what is Reflection and How to use Reflection in Java with Examples. Is it illegal to carry someone else's ID or credit card? Portability in high-level computer programming is the usability of the same software in different environments. Support for this imaginary CPU is what allows Java programs to run without being recompiled on different CPUs. • Distributed: Java is designed for the distributed environment of the internet. Right from elementary schools, now, Java is being taught as an Is it considered offensive to address one's seniors by name in the US? I've heard that there are C compilers that generate Java byte code instead of native machine code, so in that case it's possible to write C code that winds up being byte-for-byte portable between JVMs. Prior to the Internet, there was no need for virtual machines to prove programs safe and virus-free. Users of computing machinery (a.k.a. Sun Microelectronics' picoJavaI core technology will be at the heart of Sun's own microJava processor line, which will target network computers. The Java 2 Platform, Enterprise Edition version 1.4 is the most complete Web services platform ever. There's no way for any language to be 100% platform-independent without something between it and the underlying OS/hardware that is specific to that OS/hardware. 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Portability of the estate tax exemption between spouses is in effect, so when Sue dies: $18 million estate less $23.16 million in two estate tax exemptions = $0 taxable estate Bob's estate won't have to use any of his estate tax exemption because all their assets are jointly titled and they pass directly to Sue by right of survivorship. Asking for help, clarification, or responding to other answers. This allowed an application to be ported to another platform without minimal changes to the high level source code. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time. Examples include Web browsers and the applet viewer in Java's software development kit (SDK). could someone please explain me what these JVM and JRE are in simple way and how these two are related. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. ggauravr wrote: Could anyone plz explain to me why actually java is considered portable even though the virtual machine for each platform is different ?? The simplicity and portability features of Java make sure that enterprises would not face any problem while designing apps related to hardware, network, or the operating system. If portability makes their lives easier and more pleasant, then they're all for it; if not, they're not. The JVM, being essentially an imaginary CPU, is independent of the source code language. The difference is that with c you usually(unless using something like LLVM) requires a recompile on new architectures, whereas java uses the same byte-code. Dynamic. Java makes it easier for these companies to compete in the Windows market, but also allows Microsoft easier entry into the OS/2 and Unix markets. We also should expect Java programs to port easier than C or C++ between those platforms that do support both. Java is well suited for both standalone and web application development and is designed to provide solutions to most of the problems faced by users of the internet era. This partitioning allows companies in the OS/2 and Unix markets to disregard Microsoft as a competitor. Java applets in the form of precompiled bytecode can be sent from a server program in one operating system to a client program (your Web browser) in another operating system without change. The applet container uses the sandbox security model, preventing applets from accessing system resources and causing harm. Because Java has high portability and low maintenance. With portability, it is not a matter of definition but more of degree. Portability is a characteristic attributed to a computer program if it can be used in an operating systems other than the one in which it was created without requiring major rework. Hence the applications are fast and reliable they are able to work with a large amount of data at hand. Does your organization need a developer evangelist? Ranch Hand Posts: 232. posted 17 years ago. hi all, i am a novice in this JAVA world. These calls are critical to writing non-trivial programs, so until this portability problem is addressed, porting will remain difficult. 2. In theory, for a new platform, only one translator would need to be written, then many applications (written in the high level language* could be executed on the new platform by running them through the translator. Java on the other hand has GUI toolkits which work(to a certain degree) on many platforms. In the current software market, for example, Microsoft is a force to be reckoned with in the Windows and Macintosh application software markets, but has almost no presence in the OS/2 and Unix markets. Here I will explain only how to read the input stream as writing to output stream is a more complicated task. (Sun has announced a CPU that will execute J-code directly, but indicates the first samples of Java chips won't appear until the second half of this year; full production of such chips will begin next year. Thus, the JVM has been shaped also to support multiple host architectures and run everywhere.But, it is too heavy for embedded devices. (See the Resources section of this article for additional information.). Compiled C code is (typically) not byte-for-byte portable the way compiled Java code is1; C (typically) compiles to native machine code, whereas Java compiles to a byte code which is run from within the JVM. Not only did C "grow" rather than being designed, but the committees writing specifications felt it was more important to that any new rules be consistent with the behavior of existing implementations (even obscure ones) than that they actually allow for the writing of portable code. Consequently, an expression like, ...more efficiently than 32-bit ones, making. Can you use the Eldritch Blast cantrip on the same turn as the UA Lurker in the Deep warlock's Grasp of the Deep feature? Understanding the three types of portability and how they work together is critical to understanding the threat to Microsoft, and Microsoft's possible responses. The idea is simple: Java technology-based software can work just about everywhere. Dynamic. The new languages also combined features for producing correct and robust code from the beginning (the language would reduce the possibilities for shooting one's foot). High level languages focused more on abstract concepts and standardization than the machine language. In fact, Java provides three distinct types of portability: source code portability, CPU architecture portability, and OS/GUI portability. Portability, in relation to software, is a measure of how easily an application can be transferred from one computer environment to another. DeepMind just announced a breakthrough in protein folding, what are the consequences? To learn more, see our tips on writing great answers. Java was started as the Oak programming language in 1991 by the James Gosling. However I've studied also that C is a portable language. "Portable" has multiple meanings with respect to C. In one sense, it refers to the fact that C compilers can easily be implemented on a wide range of hardware, from micros (PCs) to mainframes. The main motive behind Java invention is to introduce a feature called Java Portability. When you compile the code, the Java compiler creates machine code (called byte code) for a hypothetical machine called Java Virtual Machine (JVM). Java solves this problem by providing a set of library functions (contained in Java-supplied libraries such as awt, util, and lang) that talk to an imaginary OS and imaginary GUI. Each of the preceding buzzwords is explained in The Java Language Environment, a white paper written by James Gosling and Henry McGilton. The problem with the master OS/GUI approach is that the ported applications often look alien on the other machines. This safety feature, combined with a much better understanding of how to quickly execute programs for imaginary CPUs, has led to rapid, widespread acceptance of the JVM. Most compilers produce object code that runs on one family of CPU (for example, the Intel x86 family). But doing that is problematic from non trivial programs, especially if a GUI is involved. This month, Bill takes an in-depth look at the API and Sun's implementation. World with two directly opposed habitable continents, one hot one cold, with significant geographical barrier between them. The prerequirement for portability is the generalized abstraction between the application logic and system interfaces.When software with the same functionality is produced for several computing platforms, portability is the key issue for development cost reduction. It is a combination of features of C and C++ with some essential additional concepts. Plausibility of an Implausible First Contact. You can't write a portable C program with a GUI, just as you can't write a portable Java program that builds cars. Every Java implementation provides libraries implementing this virtual OS/GUI. • Dynamic: Java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. Standardization goes in hand with portability. Native code requires a separate build framework, and that may have platform / portability issues as well. Now applications only needed an interpreter for this intermediate executable language and they could run on a new platform. You could not take a compiled executable from an x68 system and run it on a Sparc or MIPS system, for example. Now that we have covered some essential terms, we'll explain each of the three types of Java portability. In fact, Asymetrix and Microsoft have announced Java compilers that emit native Microsoft Windows applications. Java provides much more rigorous semantics and leaves less up to the implementer. Thus began high level languages. Why the difficulty? Java has generated a lot of excitement in the programming community because it promises portable applications and applets. Get solutions The fact that there are three distinct types of portability is critical, because only one of these types is a threat to Microsoft. Portability in high-level computer programming is the usability of the same software in different environments. The thinkers in computer science started working on strategies to reduce the time required to port an application running on one manufacturer's computer (e.g. This idea is not new; languages such as C and C++ have provided the opportunity for this level of portability for many years. I read about javas portability over any other language , but could somebody explain to me what it is that makes java portable and/or give me some references as to where I … Java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. Java program can be easily moved from one computer system to another, anywhere and anytime. programs written for one type of computer or operating system can be run on another type of computer or operating system." Addressing Portability: Many computers of different types with several operating systems are connected to network / internet. The Java language can produce J-code. really? When people talk about portability, feel free to question their definition as it applies to the source language or to the executable of the application. In general, programs that adhere to standard program interfaces such as the X/Open UNIX 95 standard C … Even without the JVM, programs written in the Java language can be expected to port (after recompiling) to different CPUs and operating systems much better than equivalent C or C++ programs. What would be the best way to implement priority based programming without adding too much of if-else processing logic. Thus most applications were tailored and optimized for one specific computing environment. On the contrary, in java there is a difference in semantics of primitive and object types. But for libraries, such as compression, audio-processing, ... which basically are pure algorithms and don't need to interact with the OS it's easy to achieve. Correlation between county-level college education level and swing towards Democrats from 2016-2020? The Internet-savvy JVM distinguishes itself from these other virtual CPU implementations by intentionally being designed to allow the generation of provably safe, virus-free code. In the days when computers were contrived, there were many processors and each had its own machine or assembly language. For full programs it's hard to achieve in practice IMO. Java syntax is based on C++ (so easier for programmers to learn it after C++). Object oriented Java is true (pure) object oriented language because object is the outer most level of Products such as Visix Software's Galaxy and Protools Software's Zinc provide this capability for C and C++. What is the exact meaning of “patch level”? ... Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time. Java is very easy to learn, and its syntax is simple, clean and easy to understand. Explain the catches? The positive effects: Copyright © 2020 IDG Communications, Inc. Java has an active community and will continue to be widely used in the future. (See the sidebar Syntax versus semantics for a discussion of the differences between semantics and syntax.). Macintosh users, for example, complained about a recent version of Microsoft Word for Macintosh because it looked and behaved like a Windows program, not like a Macintosh program. So yes, the c language is portable. Applet Container: An applet container is the environment that runs a Java applet and provides secure applet execution. Introduction of Java. Platform independence could be achieved for a C/C++ program, by compiling it for every platform. The result: portability between different CPUs. What is the word to describe languages that have classes and inheritance? This is when the demand for portability began. Java programs that use these libraries to provide needed OS and GUI functionality port fairly easily. To add more to why Java is Important, Java’s platform independence, portability … They just work, on any kind of compatible device that supports the Java platform. byte code). Java has removed many complicated and rarely-used features, for example, explicit pointers, operator overloading, etc. Java was started as the Oak programming language in 1991 by the James Gosling. ... Let me explain a bit about Procedural Programming Language. IBM). Thanks for contributing an answer to Software Engineering Stack Exchange! Software Engineering Stack Exchange is a question and answer site for professionals, academics, and students working within the systems development life cycle. Java 3D is near final release and has already created quite a stir in the Java graphics community. Developers have a vested interest in creating portable software. The semantics in C++ are consistent between primitive and object types. Java is indeed known for this due to the fact that it runs on something called as an intermediate code called bytecode. Portability is often associated in degree rather than a hard coded definition. I'd list some languages that are more portable than C, but the list would pretty much consist of every language in existence except Assembler. The prerequirement for portability is the generalized abstraction between the application logic and system interfaces.When software with the same functionality is produced for several computing platforms, portability is the key issue for development cost reduction. But the compiler output obviously isn't, because it is machine code and only runs on one (family of) processor. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. As long as the developer stayed within these bounds, the programs would build and execute on different platforms. Explain how Java addresses the issue of portability and security. Java has generated a lot of excitement in the programming community because it promises portable applications and applets. This feature makes java platform independant. And again, when creating new languages, other features would be added. In Java, memory doesn't get freed until it can no longer be accessed, and the language doesn't have any uninitialized variables. It's easy to imagine a byte-code implementation of c which directly runs on different architectures, or a directly compiling version of java which needs a recompile on new architectures. Developers: Opportunities and threats loom large. Licensees such as LG Semicon, Toshiba Corp., and Rockwell Collins Inc. also plan to produce Java chips based on the picoJavaI core.). Portability Testing is the type of Software Testing which is carried out to determine the degree of ease or difficulty to which a software application can be effectively and efficiently transferred from one hardware, software or environment to another one..
2020 explain portability in java