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TropicMonkey

Is Java needed in order to run applications created in Java?

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Likewise, is Adobe Flash Player needed to run content created in ActionScript? It sounds obvious, but I'm not sure if I'm understanding this correctly. Also, does the Adobe Flash Player itself read and interpret the source code created in ActionScript to run run the application?

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What is Java technology and why do I need it?

Java is a programming language and computing platform first released by Sun Microsystems in 1995. It is the underlying technology that powers state-of-the-art programs including utilities, games, and business applications. Java runs on more than 850 million personal computers worldwide, and on billions of devices worldwide, including mobile and TV devices.

 

 

Why do I need Java?

There are lots of applications and websites that won't work unless you have Java installed, and more are created every day. Java is fast, secure, and reliable. From laptops to datacenters, game consoles to scientific supercomputers, cell phones to the Internet, Java is everywhere!

 

http://www.java.com/en/download/faq/whatis_java.xml

Edited by EddieV223
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Everybody should have Java Runtime in their computer and if not then get it.  Updating your Java Runtime Environment would be a good idea, too.  Windows OS users should look into this especially because Microsoft does not aggressively support. ( Throat clearing here laugh.png )

 

Java is quite powerful, regardless if the programmer likes to use it or not.  If you can effectively learn to program with precompiling or Just In Time (JIT) compiling when appropriate, then you have very good performance competitive in the league with the best out there. The Java system is [I]built[/I] for cross-platform implementations to be as easy as possible, which is much of the reason why billions of devices run it.  By contrast, Microsoft makes you jump through hoops and you still fall short with Common Language Runtime of the .NET Framework in full cross-platform implementation (Saying this to show advantage in using Java).  Sure there is OpenGL in any case, but with Java Runtime Environment one stage of work is eliminated.

 

Look into jMonkey, by the way.

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You should read up about the "Java environment" before deploying any application. It will probably save you a few headaches while researching something.

 

That means, what "byte code" is, whats a Java Virtual Machine (interpreted languages and "Just-in-time" compilation concepts would be nice too), what are the different editions of Java (Java EE, Java SE, Java ME), whats the Java Development Kit, whats the "Java Native Interface", and so on.

 

Its not to complicate your life but to make it easier later when you're researching more complex things.

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You can convert your JARs into EXEs using Jarsplice or similar tools, but it is fair to assume most people will either have java or wont have a problem if your installer prompts an installation of the JRE.

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You can convert your JARs into EXEs using Jarsplice or similar tools, but it is fair to assume most people will either have java or wont have a problem if your installer prompts an installation of the JRE.

 

 

This used to be true; not so much any more, at least so far as Apple goes.  Apple has outright disabled Java on newer releases due to security problems.... or at least, that's the excuse Apple gave.  I honestly wouldn't be surprised to see Microsoft follow suit.  When you've got the Department of Homeland Security telling people to disable/remove Java, that's all encouragement Microsoft needs... if their lawyers give them the go-ahead that is.

 

Java is still out there on all platforms, it's just not quite so simple to assume its there as it was even a year ago.

Edited by Serapth
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The Java scare reminds me of the ActiveX fright back years when many more people then lacked good anti-malware or did stupid things like turn off User Account Control because they read about it or their friends said that it makes everything much easier to install - LOL. 

 

If a person has good anti-virus software and manages the computer the way they should, then all threats are nearly eliminated.

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You can convert your JARs into EXEs using Jarsplice or similar tools, but it is fair to assume most people will either have java or wont have a problem if your installer prompts an installation of the JRE.

 
 
This used to be true; not so much any more, at least so far as Apple goes.  Apple has outright disabled Java on newer releases due to security problems.... or at least, that's the excuse Apple gave.  I honestly wouldn't be surprised to see Microsoft follow suit.  When you've got the Department of Homeland Security telling people to disable/remove Java, that's all encouragement Microsoft needs... if their lawyers give them the go-ahead that is.
 
Java is still out there on all platforms, it's just not quite so simple to assume its there as it was even a year ago.


The Java security problem is with the applet browser plugin though and the only problem(allthough it is a serious one since applets can launch without the users consent) is that the sandbox can be circumvented (giving a applet the same level of access as a native application). Its not a problem with proper java applications (Which should have that level of access anyway since it is launched explicitly by the user)
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You can convert your JARs into EXEs using Jarsplice or similar tools, but it is fair to assume most people will either have java or wont have a problem if your installer prompts an installation of the JRE.

 
 
This used to be true; not so much any more, at least so far as Apple goes.  Apple has outright disabled Java on newer releases due to security problems.... or at least, that's the excuse Apple gave.  I honestly wouldn't be surprised to see Microsoft follow suit.  When you've got the Department of Homeland Security telling people to disable/remove Java, that's all encouragement Microsoft needs... if their lawyers give them the go-ahead that is.
 
Java is still out there on all platforms, it's just not quite so simple to assume its there as it was even a year ago.

 

The Java security problem is with the applet browser plugin though and the only problem(allthough it is a serious one since applets can launch without the users consent) is that the sandbox can be circumvented (giving a applet the same level of access as a native application). Its not a problem with proper java applications (Which should have that level of access anyway since it is launched explicitly by the user)

 

Apple still removed it as a result, not just the plugin.

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You should read up about the "Java environment" before deploying any application. It will probably save you a few headaches while researching something.

 

That means, what "byte code" is, whats a Java Virtual Machine (interpreted languages and "Just-in-time" compilation concepts would be nice too), what are the different editions of Java (Java EE, Java SE, Java ME), whats the Java Development Kit, whats the "Java Native Interface", and so on.

 

Its not to complicate your life but to make it easier later when you're researching more complex things.

 

I've done a decent amount of reseach so I am starting to understand these things. Correct me if I'm wrong. When you compile Java source code, the source code is converted to byte code. The byte code is then read by the Java Virtual Machine which can run the program. 

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You should read up about the "Java environment" before deploying any application. It will probably save you a few headaches while researching something.

 

That means, what "byte code" is, whats a Java Virtual Machine (interpreted languages and "Just-in-time" compilation concepts would be nice too), what are the different editions of Java (Java EE, Java SE, Java ME), whats the Java Development Kit, whats the "Java Native Interface", and so on.

 

Its not to complicate your life but to make it easier later when you're researching more complex things.

 

I've done a decent amount of reseach so I am starting to understand these things. Correct me if I'm wrong. When you compile Java source code, the source code is converted to byte code. The byte code is then read by the Java Virtual Machine which can run the program. 

Yep. A Java compiler (usually) does a minimal ammount of work to get your sources "translated" in a assembly-like language that targets the Java Virtual Machine (think of the JVM as a virtual CPU).

 

The JVM does the heavy work load by analyzing that bytecode and translating it into something your actual CPU can understand. That's why you need a JVM on every computer you want to run your Java program, because thats the piece that connects the bytecode to something the user's CPU can execute.

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