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Java 5 or Java 6 was preinstalled on Mac OS X up to 10.6, but this ceased in 10.7. Besides, a recent Mac OSX update uninstalls the version of Java 6 plugin previously supported by Apple.
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Java Runtime Environment Review. Java Runtime Environment is an essential tool for developers, which enables you to create various types of software, from different programs and games to web services and applications, as well as run those apps that are written in the Java programming language. I´m using Mac OS Lion, with java version 1.6.026 I'm making a small app for Mac in Java with a main menu for the user, so he can choose several options. One of them is install an app using a.pkg. Java Standard Edition (SE) is a free software bundle that provides the Java Runtime Environment and the libraries and components you need to display a wide range of programs and Web content on 32.
JavaObject Oriented ProgrammingProgramming
All three JDK, JRE and JVM are interdependent and there is no common point so it is not effective to state their difference in the tabular form however we will discuss these in following paragraphs.
JVM
JVM is the abbreviation for Java virtual machine which is basically specification that provides a runtime environment in which Java byte code can be executed i.e it is something which is abstract and its implementation is independent to choose the algorithm and has been provided by Sun and other companies. It is JVM which is responsible for converting Byte code to the machine specific code. It can also run those programs which are written in other languages and compiled to Java bytecode.The JVM performs the mentioned tasks: Loads code, Verifies code, Executes code, Provides runtime environment.
JRE
JRE is Java runtime environment which is the implementation of JVM i.e the specifications which are defined in JVM are implemented and creates corresponding environment for the execution of code.JRE comprises mainly java binaries and other classes to execute the program alike of JVM it physically exists. Along with Java binaries JRE also consist of various technologies of deployment, user interfaces to interact with code executed, some base libraries for different functionalities and language and util based libraries.
JDK
Java Runtime For Mac
JDK is abbreviation for Java Development Kit which includes all the tools, executable and binaries required to compile, debug and execute a Java Program.JDK is platform dependent i.e there is separate installers for Windows, Mac, and Unix systems.JDK includes both JVM and JRE and is entirely responsible for code execution. It is the version of JDK which represent version of Java.
Following are the important differences between JDK,JRE and JVM
Sr. No. | Key | JDK | JRE | JVM |
---|---|---|---|---|
1 | Definition | JDK (Java Development Kit) is a software development kit to develop applications in Java. In addition to JRE, JDK also contains number of development tools (compilers, JavaDoc, Java Debugger etc.). | JRE (Java Runtime Environment) is the implementation of JVM and is defined as a software package that provides Java class libraries, along with Java Virtual Machine (JVM), and other components to run applications written in Java programming. | JVM (Java Virtual Machine) is an abstract machine that is platform-dependent and has three notions as a specification, a document that describes requirement of JVM implementation, implementation, a computer program that meets JVM requirements, and instance, an implementation that executes Java byte code provides a runtime environment for executing Java byte code. |
2 | Prime functionality | JDK is primarily used for code execution and has prime functionality of development. | On other hand JRE is majorly responsible for creating environment for code execution. | JVM on other hand specifies all the implementations and responsible to provide these implementations to JRE. |
3 | Platform Independence | JDK is platform dependent i.e for different platforms different JDK required. | Like of JDK JRE is also platform dependent. | JVM is platform independent. |
4 | Tools | As JDK is responsible for prime development so it contains tools for developing, debugging and monitoring java application. | On other hand JRE does not contain tools such as compiler or debugger etc. Rather it contains class libraries and other supporting files that JVM requires to run the program. | JVM does not include software development tools. |
5 | Implementation | JDK = Java Runtime Environment (JRE) + Development tools | JRE = Java Virtual Machine (JVM) + Libraries to run the application | JVM = Only Runtime environment for executing the Java byte code. |
This page describes how to install and uninstall JRE 8 on OS X computers.
Note: The JRE installation includes the JavaFX Runtime which is incorporated into the same directory structure. |
This page has these topics:
See 'JDK 8 and JRE 8 Installation Start Here' for general information about installing JDK 8 and JRE 8.
See 'OS X Platform Install FAQ' for general information about installing JRE 8 on OS X.
System Requirements
Observe these requirements:
- Any Intel-based computer running OS X 10.8 (Mountain Lion) or later.
- Administrator privileges.
Note that installing the JRE on OS X is performed on a system-wide basis, for all users, and administrator privileges are required. You cannot install Java for a single user.
Only one JRE can be installed at a time. The system will not install a JRE that has a lower version than the current version. If you wish to install a lower version of the JRE, uninstall the current version as described in 'Uninstalling the JRE'.
Installing a JRE from Oracle will not update
java -version
symlinks or add java
to your path. To be able to do this, you need to install the JDK.JRE Downloaded File
Depending on your processor, the downloaded file has one of the following names, where
version
is the update number:jre-8u
version
-macosx-amd64.dmg
jre-8u
version
-macosx-x64.dmg
Installing JRE 8u40
If you are installing JRE 8u40, then follow these steps:
- Download the file.Before the file can be downloaded, you must accept the license agreement.
- From either the Downloads window of the browser, or from the file browser, double click the file
.dmg
to launch it.A Finder window appears containing an icon of an open box and the name of the.app
file. - Double click the package icon to launch the Install app.A window appears that says, 'Java 8 Update 40 is trying to install a new helper tool. Type your password to allow this.'Enter the Administrator login name and password and then click Install Helper.The Install app then displays the Introduction window.
- Click Next.Oracle has partnered with companies that offer various products. The installer may present you with the option to install these programs when you install Java. Specify if you want these programs installed and then click Next.Note:You can disable the presentation of offers during installation by specifying the
--args SPONSORS=0
option in the terminal command line. For example:open /Volumes/Java 8 Update 40/Java 8 Update 40.app --args SPONSORS=0
An Installation Progress window is displayed. Once the software is installed, a confirmation window appears and then an applet is launched to verify the version of Java installed. - Delete the
.dmg
file if you want to save disk space.
Determining the Installed Version of the JRE
If you have not yet installed Apple's Java OS X 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences app. See 'Note for Users of OS X that Include Apple Java 6 Plug-in'.
Only one JRE can be installed. Installing a JRE removes the previously installed JRE. The JRE version used by the system can be determined in one of two ways:
![What What](/uploads/1/3/4/8/134834591/347942094.png)
Java 6 Runtime For Mac
- From System Preferences click the Java icon from the Other category. This launches the Java Control Panel. Click About.
- Type the following in a Terminal window (note escaped space character, ignore line break):
What Is Java Runtime For Mac Os
The system will not install a JRE that has a lower version than the current version. If you want to install a lower version, first uninstall the existing version.
Uninstalling the JRE
To uninstall the JRE, you must have Administrator privileges and execute the remove commands either as root or by using the sudo(8) tool.
Remove one directory and one file (a symlink), as follows:
- Navigate to
/Library/Internet Plug-Ins
and remove theJavaAppletPlugin.plugin
directory. - Navigate to /
Library/PreferencePanes
and removeJavaControlPanel.prefpane
.
Do not attempt to uninstall Java by removing the Java tools from
/usr/bin
. This directory is part of the system software and any changes will be reset by Apple the next time you perform an update of the OS.