What do you need for java?

Answer 1

Feel free to edit and improve this answer; I needed an answer myself, and found the question but no answer to date, and so am giving it a whirl:

When I hear "Java" I'm thinking of a JRE or Java Runtime Environment. (It's not the same as JavaScript, however, which our present question does not touch.) JRE supports (a) the writing of applications to run on several Operating Systems; and (b) applications that need Java in order to run. So, if you don't have Java, but need either or both to write or use applications that are supported by Java, why then it seems you'd need to install Java. On the other hand, if you already have Java, and are not sure whether to uninstall it, you will want to find out whether you need to write or use such applications. The first should be easy: just ask yourself if you need to write such programs The second... here's where I'd love some help editing the answer!

Temporarily and tentatively, you could (a) right click each application you suspect might use Java, choose "properties", and see when the program was last used. Some kinds of programs that use Java are those that show 3-D images from various angles, those that move images around a lot. Example, architectural design programs, and many games. (b) Perhaps also, you can poke around in the Java files, and see if you can find out when Java was last used. In any case, you can (a) set a "Recovery Point" (in Windows at least), and then use "Add/Delete Programs" to uninstall your Java program(s), and see if everything you usually use is still working. If not, you undo the change by restoring that Recovery Point. (I'm supposing you are at least moderately computer savvy and know what you're doing, or have a friend who is.)

Part of the decision depends on the benefits and drawbacks of having Java. Its benefits are many (see the web-site of the Java folks). Its drawbacks are its huge size and consequent use of much memory and much time for installing and for updating. (It was the huge updates that got me to find and ask the same Question we're editing now.)

Answer 2

the Python is to be used if you are doing programming only

Python is an interpreted, object-oriented, high-level programming language with dynamic semantics. Its high-level built in data structures, combined with dynamic typing and dynamic binding, make it very attractive for Rapid Application Development, as well as for use as a scripting or glue language to connect existing components together. Python's simple, easy to learn syntax emphasizes readability and therefore reduces the cost of program maintenance. Python supports modules and packages, which encourages program modularity and code reuse. The Python interpreter and the extensive standard library are available in source or binary form without charge for all major platforms, and can be freely distributed.

Often, programmers fall in love with Python because of the increased productivity it provides. Since there is no compilation step, the edit-test-debug cycle is incredibly fast. Debugging Python programs is easy: a bug or bad input will never cause a segmentation fault. Instead, when the interpreter discovers an error, it raises an exception. When the program doesn't catch the exception, the interpreter prints a stack trace. A source level debugger allows inspection of local and global variables, evaluation of arbitrary expressions, setting breakpoints, stepping through the code a line at a time, and so on. The debugger is written in Python itself, testifying to Python's introspective power. On the other hand, often the quickest way to debug a program is to add a few print statements to the source: the fast edit-test-debug cycle makes this simple approach very effective.

Answer 3

It seems convenient to download updates to Java, as well as updates to several other pieces of software on a computer. Quite often, these updates include security updates to recently-discovered, or recently-fixed, vulnerabilities; not downloading the updates is therefore a security risk.

Answer 4

To run Java programs, you only need to install the runtime (the Java Virtual Machine). If it is for running programs in a browser, most browsers already have this included, or suggest to download it when you access a Web page that uses Java.

To write your own Java programs, you need the runtime (in the case of Windows, the java.exe program), and also the compiler (javac.exe in the case of Windows). However, it is better to download some IDE (for example, NetBeans), which includes everything you need, including editing tools, debugging tools, etc.

Answer 5

To write and run a Java programme, you'll need to download and install the Java SE Development Kit (or JDK for short, and SE means Standard Edition). A JDK consists of the following components: The Java Runtime Environment (JRE) is the heart of the Java platform, allowing you to run Java programmes on your computer.

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Answer 6

The only time you need to have Java installed is if you want to run programs written in Java, or visit web pages with embedded Java applets.

Answer 7

you need to have a Java Runtime Environment (JRE) to execute Java programs.

You need the Java Development Kit (JDK) to develop java programs.

Answer 8

JRE or Java Runtime Environment is required in your computer if you want to execute Java programs. Without a JRE in your system you will not be able to run java programs.

Answer 9

If you mean "do you need to download Java to program in it" then yes, you need to JDK and JRE to program/compile/run Java.