تثبيت جافا هو واحد من الأشياء القليلة التي يفعلها الناس بعد تنصيب Ubuntu، وفي هذا الموضوع سنتطرق إلى تثبيت الجافا على أوبونتو 14.04 مع توضيح الفروقات بين نسخ الجافا المختلفة.
JRE ضد OpenJDK ضد Oracle JDK
قبل الشروع في تثبيت جافا، يجب علينا أن نعي الفروق بين نسخ الجافا هذه، دعونا نأخذ نظرة سريعة عن هذه النسخ:
JRE: وهي اختصار لـ (Java Runtime Environment)، وهي البرمجية التي يحتاج إليها عموم المستخدمين العاديين لتشغيل التطبيقات المكتوبة بلغة جافا، هذا كل ما تحتاجه إذا كنت لست مبرمجا.
JDK: وهي ترتكز على عُدّة تطوير الجافا (Java Development Kit)، وهذا ما تحتاج إليه للقيام ببعض عمليات التطوير والبرمجة المتعلقة بجافا.
OpenJDK: وهو التطبيق المفتوح المصدر من عُدّة تطوير الجافا (Java Development Kit)، وهذه النسخة أيضا ملائمة لمعظم احتياجات المستخدمين العاديين، ولكن الأفضلية تعود إلى JRE في هذا السياق.
Oracle JDK: هو إصدار أوراكل الرسمي لـ عُدّة تطوير الجافا، ومن الأمثلة التي تستخدمها، المحرر البرمجي Android Studio.
تثبيت Java على Ubuntu 14.04
# قبل البدء بعملية التثبيت، ينبغي التحقق ما إذا كانت برمجية الجافا مُثبتة لديك فعلا.
للتحقق وجود جافا في النظام، افتح الطرفية Ctrl+Alt+T والصق الأمر الآتي:
java -version
– إذا ظهرت لك المخرجات الآتية أو ما يشابهها:
The program ‘java’ can be found in the following packages:
* default-jre
* gcj-4.6-jre-headless
* openjdk-6-jre-headless
* gcj-4.5-jre-headless
* openjdk-7-jre-headless
Try: sudo apt-get install
فهذا يعني أن الجافا ليست مُثبتة لديك، وعليك القيام بتنصيبها، وسنشرع في عملية التنصيب.
تثبيت JRE
افتح الطرفية Ctrl+Alt+T والصق الأمر الآتي:
sudo apt-get install default-jre
تثبيت OpenJDK
افتح الطرفية Ctrl+Alt+T والصق الأمر الآتي:
sudo apt-get install default-jdk
تثبيت Oracle JDK
افتح الطرفية Ctrl+Alt+T والصق الأوامر الآتية (*تأكد من أن تمتلك إنترنت عالي السرعة، لأنه سيتم تحميل الكثير من الملفات في حالة Oracle JDK).
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
sudo apt-get install oracle-java8-set-default
(*في حال أردت تثبيت الإصدار السابع من oracle jdk، قم بإبدال java8 بـ java7 في الأوامر أعلاه).
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Install Java is one of the few things that people do it after the installation of Ubuntu, and in this issue we will look to install Java on Ubuntu 14.04 with clarifying the differences between the various versions JavaScript.
OpenJDK JRE against against Oracle JDK
Before proceeding to install Java, we must be aware of the differences between the versions of these JavaScript, let's take a quick look on these copies:
JRE: It is an abbreviation for (Java Runtime Environment), which is the general code that ordinary users needed to run applications written in Java, that's all you need if you are not a programmer.
JDK: It is based on the Java Development Kit (Java Development Kit), and this is what you need to do some development operations and programming related to Java.
OpenJDK: It is an open source application development kit from Java (Java Development Kit), and this version is also suitable for most ordinary users' needs, but the preference back to the JRE in this context.
Oracle JDK: Oracle is the official version of the Java Development Kit, and the examples you use, the editor programmatic Android Studio.
Java installed on Ubuntu 14.04
# Before starting the installation, should check whether the software you have installed Java actually.
To verify the presence of Java in the system, open a terminal Ctrl + Alt + T and paste the following command:
java -version
- If you see the following output or similar:
The program 'java' can be found in the following packages:
* Default-jre
* Gcj-4.6-jre-headless
* Openjdk-6-jre-headless
* Gcj-4.5-jre-headless
* Openjdk-7-jre-headless
Try: sudo apt-get install
It means that Java is not installed, you just installed and you need to do, and we will proceed to the installation process.
Install the JRE
Open the terminal Ctrl + Alt + T and paste the following command:
sudo apt-get install default-jre
Install OpenJDK
Open the terminal Ctrl + Alt + T and paste the following command:
sudo apt-get install default-jdk
Oracle JDK installed
Open the terminal Ctrl + Alt + T and paste the following commands (* Make sure that owns High-Speed Internet, because it will download a lot of files in the Oracle JDK) case.
sudo add-apt-repository ppa: webupd8team / java
sudo apt-get update
sudo apt-get install oracle-java8-installer
sudo apt-get install oracle-java8-set-default
(* In case you want to install the seventh version of the oracle jdk, then replacement java8 b java7 at the command above).
--------------------------------------
Install Java is one of the few things that people do it after the installation of Ubuntu, and in this issue we will look to install Java on Ubuntu 14.04 with clarifying the differences between the various versions JavaScript.
OpenJDK JRE against against Oracle JDK
Before proceeding to install Java, we must be aware of the differences between the versions of these JavaScript, let's take a quick look on these copies:
JRE: It is an abbreviation for (Java Runtime Environment), which is the general code that ordinary users needed to run applications written in Java, that's all you need if you are not a programmer.
JDK: It is based on the Java Development Kit (Java Development Kit), and this is what you need to do some development operations and programming related to Java.
OpenJDK: It is an open source application development kit from Java (Java Development Kit), and this version is also suitable for most ordinary users' needs, but the preference back to the JRE in this context.
Oracle JDK: Oracle is the official version of the Java Development Kit, and the examples you use, the editor programmatic Android Studio.
Java installed on Ubuntu 14.04
# Before starting the installation, should check whether the software you have installed Java actually.
To verify the presence of Java in the system, open a terminal Ctrl + Alt + T and paste the following command:
java -version
- If you see the following output or similar:
The program 'java' can be found in the following packages:
* Default-jre
* Gcj-4.6-jre-headless
* Openjdk-6-jre-headless
* Gcj-4.5-jre-headless
* Openjdk-7-jre-headless
Try: sudo apt-get install
It means that Java is not installed, you just installed and you need to do, and we will proceed to the installation process.
Install the JRE
Open the terminal Ctrl + Alt + T and paste the following command:
sudo apt-get install default-jre
Install OpenJDK
Open the terminal Ctrl + Alt + T and paste the following command:
sudo apt-get install default-jdk
Oracle JDK installed
Open the terminal Ctrl + Alt + T and paste the following commands (* Make sure that owns High-Speed Internet, because it will download a lot of files in the Oracle JDK) case.
sudo add-apt-repository ppa: webupd8team / java
sudo apt-get update
sudo apt-get install oracle-java8-installer
sudo apt-get install oracle-java8-set-default
(* In case you want to install the seventh version of the oracle jdk, then replacement java8 b java7 at the command above).
