Guide Java für Android (German Edition)

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The learning curve for a programming language depends a great deal on your current knowledge, intended language use, and learning environment. Python is the current language of choice in schools because it helps people build good coding techniques very quickly, and it has a robust range of uses. Code presentation is also an increasingly important distinction between the two languages. In the past, developers used code largely to create applications. However, now that people with differing perspectives and skills use programming languages as they work toward a wide variety of goals not necessarily application development , you also need to consider their needs and skills.

Python may have an edge here because it fully supports the literate programming approach originally conceived of by Stanford computer scientist Donald Knuth. When working with literate programming techniques, a single document contains code, explanatory prose, graphs, pictures, and all sorts of other material, yet the code remains fully executable within the environment. You can also add this support to other editors, such as Atom , using special instructions.

When working in a similar environment using Java, by contrast, the environment can feel bolted on and the learning curve tends to be higher. The problem with comparing the speed of one language to another is that it often comes down to the environment—you can create a test that favors one language over another in a lab setting, but the results that matter are those that you see in the field.

In addition, you must consider issues such as the libraries used and the coding style employed in creating the application at least with Python. Comparing Python performance of Python apps written using the functional paradigm vs. On the Java side, most applications are versions behind the current version.

Your software will soon have users from San Francisco to Shenzhen.

On the Python side, Python 3. So while it might seem counterproductive, some data science programmers and others still choose to use Python 2. Note that the Python community has struggled to make the transition from 2x to 3x, and is currently maintaining both forks. Still, as Python 2. Ultimately, performance is a maddeningly complex metric. Which language runs fastest usually comes down to environment—how the code is written, used, and run, not to mention the effects of the libraries and other external contributors.

Comparing the relative popularity of various programming languages is also notoriously difficult.

Installing the language packs

But in most attempts to rank languages by popularity—either here on the New Relic blog or on sites such as Tiobe , Java typically comes in first overall, with Python not far behind, typically placing somewhere in the top five. Importantly, both languages are supported by large and vibrant user communities. This map application lets you drill down to find a JUG near you. Java programmers can also attend giant, high-profile events, such as JavaOne.

The Python community is also strong, with 1, Python user groups in cities and 37 countries attracting more than , members. Python events range from PyLadies meetups where women can meet and code together to PyCon and many others. Knowing any of these languages will help get you a job.

However, as noted earlier, the true point of a programming language is to serve the needs of a developer in conveying a particular task to the machine in the most straightforward and clear manner possible. For some developers, straightforward translates into the fewest lines of code or the fastest application speed. But the issue goes far beyond either of those considerations. Java comes in third for this group—still quite high. Flexibility also matters. When working with Python, you have access to multiple programming paradigms that you can mix and match as needed within a single application.

Java supports only one programming paradigm: object-oriented. Interestingly, Python supports multiple programming paradigms in a single application, which means you can use the particular paradigm that best suits a subtask within the application, rather than relying on a single paradigm whether or not it best meets the need. Reinventing the wheel is never fun.

Developers also need other forms of support to ensure applications are up and running as quickly as possible and continue to perform as expected. One way to do this is to use an agent to monitor applications, but writing an agent can be time consuming and error prone. New Relic, of course, has agents for both Java and Python. The New Relic Java Agent , for example, can help you optimize application speed by monitoring things like which classes the JVM is actually loading and unloading.

Of course, New Relic also lets you monitor other Java-environment issues, such as garbage collection. For more information, see the New Relic Java documentation. The New Relic Python Agent , meanwhile, is designed to take full advantage of the Python environment. For example, you use a pip install to implement the New Relic Agent, which is precisely the same approach used for every Python library.

You also gain access to all of the essential elements of the Python environment, including server information. The point is that there is no single best programming language—just ones that most closely meet your needs at any given time, for any given project.

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In the end, though, it is possible to make some generalizations about programming languages. Python would be my personal choice for data science, AI, and machine learning tasks. On the other hand, when I need to write applications for end users, especially embedded and cross-platform apps, Java is likely going to be at the top of my list. Java is also an outstanding choice for creating server-side code.

Whether or not those preferences hold true for you, hopefully this comparison is helpful in making your own choices of programming languages. John Mueller is a freelance author and technical editor, with books and more than articles to his credit on topics ranging from networking to artificial intelligence and from database management to heads-down programming. View posts by John Paul Mueller. The views expressed on this blog are those of the author and do not necessarily reflect the views of New Relic. This blog may contain links to content on third-party sites.

By providing such links, New Relic does not adopt, guarantee, approve or endorse the information, views or products available on such sites. Interested in writing for New Relic Blog? Send us a pitch! New Relic Sign Up Now. In November of that year, the Green Project was spun off to become Firstperson , a wholly owned subsidiary of Sun Microsystems, and the team relocated to Palo Alto, California.

However, the cable industry felt that their platform gave too much control to the user, so Firstperson lost their bid to SGI. An additional deal with The 3DO Company for a set-top box also failed to materialize. Unable to generate interest within the television industry, the company was rolled back into Sun. They felt that with the advent of graphical web browsers like Mosaic the Internet could evolve into the same highly interactive medium that they had envisioned for cable TV.

In , Sun renamed the Oak language to Java after a trademark search revealed that Oak Technology used the name Oak. While the so-called Java applets for web browsers no longer are the most popular use of Java with it e. Sun released JDK 1. J2SE 1. J2SE 5. It was originally numbered 1. It was bundled with a database manager and facilitates the use of scripting languages with the JVM such as JavaScript using Mozilla 's Rhino engine. This version is not officially supported on the Windows XP platform. Java SE 9 and 10 had higher system requirements, i. Java SE 11 was released September , the first LTS release since the rapid release model was adopted starting with version 9.

For the first time, OpenJDK 11 represents the complete source code for the Java platform under the GNU General Public License, and while Oracle still dual-licenses it with an optional proprietary license, there are no code differences nor modules unique to the proprietary-licensed version.

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  4. Java SE 12 was released March Some Java applications are in fairly widespread desktop use, including the NetBeans and Eclipse integrated development environments , and file sharing clients such as LimeWire and Vuze. Java is also used in the MATLAB mathematics programming environment, both for rendering the user interface and as part of the core system. Java provides cross platform user interface for some high end collaborative applications such as Lotus Notes. Oracle plans to first deprecate the separately installable Java browser plugin from the Java Runtime Environment in JDK 9 then remove it completely from a future release, forcing web developers to use an alternative technology.

    NET Compact Framework. With handset designs improving more rapidly than the standards, some manufacturers relax some limitations in the standards, for example, maximum program size. Google's Android operating system uses the Java language, but not its class libraries, therefore the Android platform cannot be called Java.

    The Java platform has become a mainstay of enterprise IT development since the introduction of the Enterprise Edition in , in two different ways:.

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    Enterprise use of Java has also long been the main driver of open source interest in the platform. Open source communities have produced a large amount of software, including simple function libraries, development frameworks, and open source implementations of standards and tools. Duke is Java's mascot. The source code for Sun's implementations of Java i.

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    As such these terms did not satisfy the requirements of either the Open Source Initiative or the Free Software Foundation to be considered open source or free software, and Sun Java was therefore a proprietary platform. While several third-party projects e. GNU Classpath and Apache Harmony created free software partial Java implementations, the large size of the Sun libraries combined with the use of clean room methods meant that their implementations of the Java libraries the compiler and VM are comparatively small and well defined were incomplete and not fully compatible.

    These implementations also tended to be far less optimized than Sun's. Schwartz said that the company was set to announce the release of the core Java Platform as free and open source software within 30 to 60 days. Sun released the source code of the Class library under GPL on May 8, , except some limited parts that were licensed by Sun from third parties who did not want their code to be released under a free software and open-source license.

    Sun's goal was to replace the parts that remain proprietary and closed-source with alternative implementations and make the class library completely free and open source. In the meantime, a third-party project called IcedTea created a completely free and highly usable JDK by replacing encumbered code with either stubs or code from GNU Classpath. However OpenJDK has since become buildable without the encumbered parts from OpenJDK 6 b10 [62] and has become the default runtime environment for most Linux distributions.

    Because OpenJDK is under the GPL, it is possible to redistribute a custom version of the JRE directly with software applications, [68] [69] rather than requiring the enduser or their sysadmin to download and install the correct version of the proprietary Oracle JRE onto each of their systems themselves. In most cases, Java support is unnecessary in Web browsers, and security experts recommend that it not be run in a browser unless absolutely necessary.

    This limited the features that could be provided by this addition as compared to some other languages. Java lacks native unsigned integer types. Unsigned data are often generated from programs written in C and the lack of these types prevents direct data interchange between C and Java. Unsigned large numbers are also used in many numeric processing fields, including cryptography, which can make Java less convenient to use for these tasks.

    While a bit signed integer may be used to hold a bit unsigned value with relative ease, a bit unsigned value would require a bit signed integer. If abstracted using functions, function calls become necessary for many operations which are native to some other languages. Alternatively, it is possible to use Java's signed integers to emulate unsigned integers of the same size, but this requires detailed knowledge of complex bitwise operations.

    Additionally, the extended precision floating-point types permitted in and present in many processors are not permitted in Java. Java's performance has improved substantially since the early versions. Java bytecode can either be interpreted at run time by a virtual machine, or it can be compiled at load time or runtime into native code which runs directly on the computer's hardware. Interpretation is slower than native execution, and compilation at load time or runtime has an initial performance penalty for the compilation. Modern performant JVM implementations all use the compilation approach, so after the initial startup time the performance is equivalent to native code.

    The Java platform provides a security architecture [81] which is designed to allow the user to run untrusted bytecode in a "sandboxed" manner to protect against malicious or poorly written software.

    Category: Java

    This "sandboxing" feature is intended to protect the user by restricting access to certain platform features and APIs which could be exploited by malware , such as accessing the local filesystem, running arbitrary commands, or accessing communication networks. In recent years, researchers have discovered numerous security flaws in some widely used Java implementations, including Oracle's, which allow untrusted code to bypass the sandboxing mechanism, exposing users to malicious attacks. These flaws affect only Java applications which execute arbitrary untrusted bytecode, such as web browser plug-ins that run Java applets downloaded from public websites.

    Applications where the user trusts, and has full control over, all code that is being executed are unaffected. On January 10, , three computer specialists spoke out against Java, telling Reuters that it was not secure and that people should disable Java. You have to disable it. On January 14, , security experts said that the update still failed to protect PCs from attack. Responding to recent Java security and vulnerability issues, security blogger Brian Krebs has called for users to remove at least the Java browser plugin and also the entire software.

    If you are a typical home user, you can probably do without it. If you are a business user, you may not have a choice. The Java runtime environment has a history of bundling sponsored software to be installed by default during installation and during the updates which roll out every month or so. This includes the " Ask. This setting is located under the "Advanced" tab in the Java Control Panel, under the "Miscellaneous" heading, where the option is labelled as an option to suppress "sponsor offers".

    Java has yet to release an automatic updater that does not require user intervention and administrative rights [94] unlike Google Chrome [95] and Flash player. From Wikipedia, the free encyclopedia. This article is about a software platform. For the programming language, see Java programming language. For the software package downloaded from java. Not to be confused with JavaScript.

    Main article: Java Virtual Machine. Main article: Java Class Library. See also: Comparison of the Java and. Main article: Java Development Kit. Main article: Java version history. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. October Learn how and when to remove this template message. See also: OpenJDK. Main article: Criticism of Java.

    Further information: Generics in Java.

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    Further information: Java performance. Further information: Java security.

    Category: Java

    Java programming language portal. Archived from the original on Retrieved Oracle Corporation. Virtual School. Sun Microsystems. Archived from the original on February 12, Retrieved February 6, New York [u. Archived from the original on May 30, Retrieved 25 August Java Community Process. Oracle Corp. Only X.