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8 Installation of the JDK and the JRE on macOS
This topic includes the following sections:
System Requirements for Installing the JDK and JRE on macOS
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The following are the system requirements for installing the JDK and the JRE on macOS:
Any Intel-based computer running macOS.
You cannot install Java for a single user. Installing the JDK and JRE on macOS is performed on a systemwide basis for all users. Administrator privileges are required to install the JDK and JRE on macOS.
When you install the JDK, it also installs the JRE. However, the system will not replace the current JRE with a lower version.
To determine the current JRE version installed on your system, see Determining the JRE Version Installed on macOS. To install an earlier version of the JRE, you must first uninstall the current version. See Uninstalling the JRE on macOS.
When you install the JRE, you can install only one JRE on your system at a time. The system will not install a JRE that has an earlier version than the current version.
To determine the current JRE version installed on your system, see Determining the JRE Version Installed on macOS. To install an earlier version of the JRE, you must first uninstall the current version. See Uninstalling the JRE on macOS.
Installing a JRE from Oracle will not update java -version symlinks or add java to your path. To do this, you must install the JDK.
Determining the JRE Version Installed on macOS
Only one JRE can be installed on the system at any time. Installing a JRE removes the previously installed JRE.
The JRE version installed on the system can be determined in one of two ways:
From System Preferences , and then the Other section, click the Java icon. This starts the Java Control Panel . You then click About to display the version information.
Enter the following in a Terminal window (note the escaped space character, ignore line break):
% /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -version
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 application. See Notes for Users of macOS That Include the Apple Java 6 Plug-in.
The system will not install a JRE that has an earlier version than the current version. If you want to install an earlier version, then you must first uninstall the existing version.
Determining the Default JDK Version on macOS
When starting a Java application through the command line, the system uses the default JDK. It is possible for the version of the JRE to be different from the default version of the JDK.
You can determine which version of the JDK is the default by entering java -version in a Terminal window. If the installed version is 10 Interim 0, Update 2, and Patch 1, then you see a string that includes the text 10 .0.2.1 . For example:
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 application. See Notes for Users of macOS That Include the Apple Java 6 Plug-in.
To run a different version of Java, either specify the full path, or use the java_home tool: For example:
$ /usr/libexec/java_home -v 10 .0.2.1 —exec javac -version
Installing the JDK on macOS
When you install the JDK, the associated JRE is installed at the same time. The JavaFX SDK and Runtime are also installed and integrated into the standard JDK directory structure. Deal of the dead mac os.
Before the file can be downloaded, you must accept the license agreement.
Installing the JRE on macOS
Before the file can be downloaded, you must accept the license agreement.
Uninstalling the JDK on macOS
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 that you perform an update of the OS.
- Go to /Library/Java/JavaVirtualMachines .
- Remove the directory whose name matches the following format by executing the rm command as a root user or by using the sudo tool:
For example, to uninstall 10 Interim 0 Update 2 Patch 1:
Uninstalling the JRE on macOS
Do not 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 that you perform an update of the OS.
- Go to /Library/Internet Plug-Ins .
- Remove the JavaAppletPlugin.plugin directory by executing the rm command as a root user or by using the sudo tool.
- Go to /Library/PreferencePanes .
- Remove JavaControlPanel.prefpane by executing the rm command as a root user or by using the sudo tool.
Installation FAQ on macOS Platform
This topic provides answers for the following frequently asked questions about installing JDK and JRE on macOS computers.
1. Should I install the JRE or the JDK?
If you only plan to run Java applications, then install the Java Runtime Environment (JRE). The JRE is also referred to as Oracle Java. After you have installed the JRE, you can start Java applets and applications by double-clicking JAR files, JNLP files, and by using the browser. Note that 32-bit browsers, such as Firefox in 32-bit mode, and Chrome, are not supported by the JRE.
If you also plan to create Java applications, then install the Java Development Kit (JDK).
2. How do I find out which version of Java is the system default?
When you start a Java application by clicking a JNLP file, or through the browser, it uses the installed JRE. Only one JRE can be installed. See Determining the JRE Version Installed on macOS.
When you run a Java application from the command line, it uses the default JDK. If you do not develop Java applications, then you do not need to worry about this. See Determining the Default JDK Version on macOS.
If you have not yet installed Apple's Java macOS 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences application. See Notes for Users of macOS That Include the Apple Java 6 Plug-in.
3. How do I clear the Java cache?
From System Preferences , start the Java Control Panel from Other section by clicking the Java icon.
From the Java Control Panel , on the General tab, go to Temporary Internet Files section and click Settings .
In the Temporary Files Settings window, click Delete File .
From the Delete Files and Applications dialog box, select Cached Applications and Applets and click OK to clear those files from the cache.
To clear the applet and Web Start cache from a window, use the following command (note escaped space character):
4. How are Java updates managed on macOS?
Every time you start a Java applet or a Java Web Start (JWS) application, the system starts your program and determines in the background (so that performance of your Java application is not affected) if it has checked for a Java update in the last 7 days.
If an update is available, then the Software Update window appears.
Select Next , and enter your user Name and Password .
The latest update gets downloaded and installed. Restart the browser and other applications to work on the new Java update.
5. How do I uninstall Java?
Depending on your installation, see the related link:
6. I have installed Java for macOS 2012-006 and Apple Java 6 can no longer be used for applets or Web Start. How do I get it back?
The Java for macOS 2012-006 update from Apple uninstalls the Apple-provided Java applet plug-in from all web browsers. You can download the latest version of Java from Java SE Downloads, which has improved security, reliability, and compatibility.
If you prefer to continue using Apple's Java 6 plug-in, follow the steps provided in the Java for OS X 2014-001 topic at the Apple Developer site.
7. After installing Java for macOS 2012-006, can I continue to use Apple's Java 6 alongside the macOS JDK or JRE for Java 10 ?
If you want to continue to develop with Java 6 using command-line, then you can modify the startup script for your favorite command environment. For bash, use this:
$ export JAVA_HOME=`/usr/libexec/java_home -v 1.6`
Some applications use /usr/bin/java to call Java. After installing Java for macOS 2012-006, /usr/bin/java will find the newest JDK installed, and will use that for all of the Java-related command-line tools in /usr/bin . You may need to modify those applications to find Java 6, or contact the developer for a newer version of the application.
8. Space cargo (itch) mac os. Can I restore Apple Java after uninstalling Oracle Java?
Go back to Apple Java using the following instructions:
Uninstall Oracle Java by deleting the plug-in file. From a command-line, enter:
% sudo rm -rf '/Library/Internet Plug-Ins/JavaAppletPlugin.plugin'
Create a symlink using the following command, entered on a single line:
% sudo ln -s /System/Library/Java/Support/CoreDeploy.bundle/Contents/JavaAppletPlugin.plugin '/Library/Internet Plug-Ins/JavaAppletPlugin.plugin'
9. I am running Mountain Lion (macOS 10.8) or later and Gatekeeper is blocking an app from launching. What is going on?
Gatekeeper, introduced in Mountain Lion (macOS 10.8), is designed to prevent potentially malicious application packages (apps) from starting. When you attempt to start an app that does not meet certain criteria, Gatekeeper will block it. To overr > App Store and identified developers from Settings , General , and Allow apps downloads from section .
To create a Java application that will start without interruption under the default Gatekeeper settings, the app must be bundled with a JRE, use Oracle's launcher stub, and be signed with an Apple Developer ID. For details on creating an app that satisfies these requirements, see Self-Contained Application Packaging for OS X in the Java Platform, Standard Edition Deployment Guide .
10. What happened to the Java Preferences app in Application Utilities?
The Java Preferences app was part of the Apple Java installation and is not used by Oracle Java. Therefore, macOS releases from Apple that do not include Apple Java will not include Java Preferences.
One of the functions of Java Preferences was to set the current version of the JRE. Under Oracle Java, only a single version of the JRE can be installed at a time. See Installing the JRE on macOS.
To access the Java Control Panel, in the System Preferences panel, click the Java icon. If you don't see the Java icon in the System Preferences , in the Other section, then you do not have an Oracle JRE installed.
11. I have Oracle's version of the JRE installed, but it is not listed in Java Preferences.
This is correct. The JRE will not show up in the Java Preferences list unless you install the full JDK.
12. I have Oracle's version of the JRE installed, but when I try to run the java command from the command line, it does not work.
Installing a JRE from Oracle does not update java -version symlinks or add the java command to your path. For this functionality, you must install the full JDK.
Notes for Users of macOS That Include the Apple Java 6 Plug-in
If you have not yet installed Apple's Java macOS 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences application.
There is an important difference about the installation of Oracle Java (both JRE and JDK) that you should be aware of. The Java Preferences application, started by selecting Applications and then Utilities , is part of Apple's implementation of Java. After Apple no longer distributes Java as part of their release, the Java Preferences application is retired.
Under Apple's implementation of Java, it was possible to have multiple JREs installed. The Java Preferences application was used to determine the first compatible version that would be used. You can change the default JRE by starting Java Preferences and then dragging Java SE 10 to the top of the list.
The Java Preferences window contains a list of installed JREs. Java applications and command-line tools use the listed order to determine the first compatible version to use. The Vendor column indicates whether the Java release is supplied by Apple or Oracle. The Version column specifies the version of Java that is installed.
Reordering the list, by dragging Java SE 10 to the top, makes it the default version of Java.
If you install only Oracle Java JRE 10 , then it will not appear in this list. You must install the full JDK for JRE 10 to be listed.
Установка Java
Для того, чтобы на вашем компьютере можно было заниматься разработкой Andorid приложений, нужно сделать из вашей системы платформу для разработки. Android SDK (пакет разработчика для Android) был разработан с использованием языка программирования Java. Аналогичным образом, приложения для Android также разрабатываются с использованием Java. Следовательно, в первую очередь необходимо установить JDK. Сама Java поставляется и с комплектом разработки (Java Development Kit — JDK), и с исполнительным (JRE) пакетами. И именно в этой статье я расскажу про установку Java на Windows, Mac OS X, Linux.
Системные требования
- Windows 2003 (32-bit or 64-bit)
- Windows Vista (32-bit or 64-bit)
- Windows 7 (32-bit or 64-bit)
- Windows 8 / Windows 8.1
- Mac OS X версии 10.5.8 или более поздней (Только системы на базе Intel)
- Системы Linux с версии 2.11 или более поздней версии библиотеки GNU C (glibc)
- Минимум 2 Гб оперативной памяти (рекомендуется 4 Гб)
- 1,5 ГБ свободного места на диске (Учитывая последующую установку Android Studio)
Установка Java Development Kit (JDK)
Установка JDK под Windows
Для систем Windows, JDK может быть получена с официального сайта корпорации Oracle по ссылке: http://www.oracle.com/technetwork/java/javase/downloads/index.html
Загрузите последнюю версию пакета JDK, который соответствует вашей системе (32- или 64-битная). После загрузки, запустите исполняемый файл установки и для завершения процесса установки просто следуйте инструкциям на экране.
Последним шагом будет установка переменных среды. Зайдите в панель управления, там перейдите по пути «Система» -> Дополнительные параметры системы -> Переменные среды. Если у вас ещё нет переменной JAVA_HOME, создайте её, а в качестве значения укажите путь до папки с установленным jdk, например Dragons lunch demo mac os.
Важным шагом будет изменение переменной PATH, в неё через «;» вам надо будет добавить путь до bin в папки с JDK, например
Иногда в начале переменной будет значение наподобие следующей:
В дальнейшем это может вызвать ошибки, так что рекомендую сразу его удалить.
Чтобы проверить успех установки, выполните в командной строке команду:
Galactic ball mac os. Должен появиться текст на подобии следующего:
Установка JDK под Mac OS X
Android Os Versions
По умолчанию Java не установлена на последних версиях Mac OS X. Чтобы проверить наличие или отсутствие установленной версии Java, откройте окно терминала и введите следующую команду:
Если в настоящее время у вас установлена Java, в окне терминала появится текст, похожий на следующий:
В том случае, если Java не установлена, выполните команду «java» в окне терминала, что приведет к появлению диалога на рабочем столе, на котором по нажатию кнопки «Дополнительно информация» (More Info), отобразится страница сайта Oracle. В самом терминале появится сообщение:
Загрузите и откройте образ диска (.dmg файл) и дважды щелкните по значку, чтобы установить пакет Java.
Появится окно установки Java для OS X и проведет вас через шаги установки JDK. После того, как установка будет завершена, вернитесь в окно терминала и выполните первую команду, после чего уже должна будет появиться нужная информация о версии Java:
Установка JDK под Linux
Во-первых, если у вас стоит 64-битная Ubuntu, значит вам необходимо установить пакет поддержки 32-битных библиотек:
Как и в случае с установкой JDK под Windows, можно скачать пакет JDK под Linux с сайта Oracle http://www.oracle.com/technetwork/java/javase/downloads/index.html. Файлы предоставляются в RPM формате (для установки на системы на базе Red Hat, такие как Red Hat Enterprise Linux, Fedora and CentOS) и в tar-архиве для других дистрибутивов Linux, например, Ubuntu.
В случае .rpm файла скачайте его, и введите команду rpm в терминале для выполнения установки. Если вы, например, скачали файл jdk-7u45-linux-x64.rpm, то команда будет выглядеть:
Для установки tar-пакета (tar.gz) выполните следующие шаги:
- Создайте папку для установки JDK (для примера будем использовать /home/demo/java)
- Скачайте подходящий tar.gz пакет в выбранную папку
- Выполните следующую команду ( замените на имя скаченного файла):
- Добавьте в переменную $PATH путь к bin в папке, куда установился JDK. Например, если если JDK установлен в папку /home/demo/java/jdk1.7.0_45, добавьте в переменную строчку
Обычно этого можно добиться добавлением команды в файл .bashrc в директории home (особенности могут отличаться от дистрибутива к дистрибутиву). Для примера, смените директорию на home, отредактируйте файл .bashrc в ней, добавив в конец следующую строчку (замените путь до JDK на актуальный для вас):
После сохранения изменений, будущие терминальные сессии будут включать в себя JDK в переменной среды $PATH.
Заключение
Теперь вы можете писать программы на Java, правда компилировать их придётся в консоли. Следующим шагом подготовки к написанию Android-приложений будет установка среды для разработки, а именно Android Studio, и пакета для разработки Android SDK.
Если у вас появлялись какие-то ошибки при установке или есть доп. вопросы, отпишитесь, пожалуйста, ниже и я помогу вам разрешить ситуацию.
JDK 7 Installation for Mac OS X
See JDK 7 and JRE 7 Installation Guide for general information about installing JDK 7 and JRE 7.
See the Mac OS X Platform Install FAQ for general information about installing JDK 7 on Mac OS X.
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Contents
System Requirements
Note that installing the JDK on a Mac is performed on a system wide basis, for all users, and administrator privileges are required. You cannot install Java for a single user.
Installing the JDK also installs the JRE. The one exception is that the system will not replace the current JRE with a lower version. To install a lower version of the JRE, first uninstall the current version.
JDK 7 Installation Instructions
Installation of the 64-bit JDK on Mac Platforms
When you download the Java Development Kit (JDK), the associated Java Runtime Environment (JRE) is installed at the same time. Weirdro mac os. The JavaFX SDK and Runtime are also installed and integrated into the standard JDK directory structure.
Depending on your processor, the downloaded file has one of the following names:
1. Download the file. Before the file can be downloaded, you must accept the license agreement.
2. From either the Downloads window of the browser, or from the file browser, double click the .dmg file to launch it.
3. A Finder window appears containing an icon of an open box and the name of the .pkg file Double click the package icon to launch the Install app.
4. The Install app displays the Introduction window. Click Continue.
4a. Note that, in some cases, a Destination Select window appears. This is a bug, as there is only one option available. If you see this window, select Install for all users of this computer to enable the continue button. Click Continue.
5. The Installation Type window appears. Click Install.
6. A window appears which says «Installer is trying to install new software. Type your password to allow this.» Enter the Administrator login and password and click Install Software.
7. The software is installed and a confirmation window appears. Click the ReadMe for more information about the installation.
After the software is installed, delete the dmg file if you want to save disk space.
Determining the Default Version of the JDK
A: If you have not yet installed Apple's Java Mac 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 Macs that Include Apple Java 6 Plug-in.
There can be multiple JDKs installed on a system – as many as you wish.
When launching a Java application through the command line, the system uses the default JDK. It is possible for the version of the JRE to be different than the version of the JDK.
You can determine which version of the JDK is the default by typing java -version in a Terminal window. If the installed version is 7u6, you will see a string that includes the text 1.7.0_06. For example:
To run a different version of Java, either specify the full path, or use the java_home tool:
For more information, see the java_home(1) man page.
Uninstalling the JDK
To uninstall the JDK, you must have Administrator privileges and execute the remove command either as root or by using the sudo(8) tool.
Navigate to /Library/Java/JavaVirtualMachines and remove the directory whose name matches the following format: *
For example, to uninstall 7u6:
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.
* The 7u4 and 7u5 releases were installed into a directory that does not follow this format. To uninstall 7u4 or 7u5, remove the 1.7.0.jdk directory from the same location.
