Java (Česky) - ArchWiki

# Java (Česky)

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"Java je programovací jazyk, původně vyvinutý společností Sun Microsystems a uvolněný v roce 1995 jako hlavní část Java platformy od Sun Microsystems. Jazyk odvozuje většinu své syntaxe z C a C++, ale má jednodušší objektový model a méně low-level prostředků. Java aplikace jsou obvykle kompilovány do mezikódu, který může běžet na libovolném Java virtuálním stoji (JVM = Java virtual machine) bez ohledu na architekturu počítače." wikipedia:Java_(programming_language)

## Instalace

Note: Installing a JDK will automatically pull its JRE dependency.
Note: After installation, the Java environment will need to be recognized by the shell (`$PATH` variable). This can be done by sourcing `/etc/profile` from the command line or by logging out/in again of a Desktop Environment.

Two common packages named java-runtime-common and java-environment-common are automatically pulled as dependency and provide environment file `/etc/profile.d/jre.sh`. This file contains all JVM common environment variables. Package java-runtime-common also provides a utility script `archlinux-java` that can display and change the default Java environment. This script sets links `/usr/lib/jvm/default` and `/usr/lib/jvm/default-runtime` to point at a valid non-conflicting Java environment installed and Java runtime in `/usr/lib/jvm/java-${JAVA_MAJOR_VERSION}-${VENDOR_NAME`}. Most executable provided by the Java environment set have direct links from `/usr/bin`, others are available in `$PATH`.

Warning: File `/etc/profile.d/jdk.sh` is not provided any more by any package.

The following packages are available in the official repositories:

### OpenJDK 7

Package name | Use
--- | ---
jre7-openjdk-headless | Java runtime environment (JRE) without any graphical tool - version 7
jre7-openjdk | Complete Java Runtime Environment (JRE) - version 7
jdk7-openjdk | Java Development Kit (JDK) - version 7
openjdk7-doc | OpenJDK javadoc - version 7
openjdk7-src | OpenJDK sources - version 7

### OpenJDK 8

Package name | Use
--- | ---
jre8-openjdk-headless | Java runtime environment (JRE) without any graphical tool - version 8
jre8-openjdk | Complete Java Runtime Environment (JRE) - version 8
jdk8-openjdk | Java Development Kit (JDK) - version 8
openjdk8-doc | OpenJDK javadoc - version 8
openjdk8-src | OpenJDK sources - version 8

### OpenJFX

JavaFX is also available from the official repositories. It requires the OpenJDK 8.

Package name | Use
--- | ---
java-openjfx | Java OpenJFX 8 client application platform (open-source implementation of JavaFX)
java-openjfx-doc | OpenJFX javadoc
java-openjfx-src | OpenJFX sources

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