Ubuntuにソフトをインストールする作法がいまいち理解出来ていない
UbuntuにJAVAをインストール
資料
http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux
以下は資料のページのコピー
1
Let's check if you have Java installed on your system by running the Java version command from terminal.
2
Open up a terminal and type the command:
Type/Copy/Paste: java -version
If it says anything such as OpenJDK, you have the wrong Java installed for this exercise, we want it to display:
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)
3
If you have the OpenJDK installed on your system you can remove it by typing the following at the command line:
Type/Copy/Paste: sudo apt-get autoremove openjdk-6-jre
Type/Copy/Paste: sudo apt-get autoremove openjdk-6-jdk
4
Create a directory to put your Oracle Java JDK and JRE binaries in, open up a terminal and create the directory /usr/local/java
Type/Copy/Paste: sudo mkdir -p /usr/local/java
5
Download the Oracle Java JDK/JRE for Linux, make sure you select the compressed binaries for your system which end in tar.gz
6
Change into the directory where the Oracle Java binaries were downloaded and move them into the /usr/local/java directory. For example, in most cases the Oracle Java binaries are downloaded to: /home/"your_user_directory"/Downloads
Type/Copy/Paste: sudo -s
Type/Copy/Paste: cd /home/"your_user_directory"/Downloads
Type/Copy/Paste: cp -r jdk-7-linux-x64.tar.gz /usr/local/java
Type/Copy/Paste: cp -r jre-7-linux-x64.tar.gz /usr/local/java
Type/Copy/Paste: cd /usr/local/java
7
Run the following commands on the downloaded Oracle Java tar.gz files, as root, in order to make them executable for all users on your system.
Type/Copy/Paste: sudo chmod a+x jdk-7-linux-x64.tar.gz
Type/Copy/Paste: sudo chmod a+x jre-7-linux-x64.tar.gz
8
Unpack the compressed java binaries, in the directory /usr/local/java
Type/Copy/Paste: tar xvzf jdk-7-linux-x64.tar.gz
Type/Copy/Paste: tar xvzf jre-7-linux-x64.tar.gz
9
At this point you should have two uncompressed binary directories in /usr/local/java for the Java JDK/JRE listed as:
jdk1.7.0
jre1.7.0
10
Edit the system PATH file /etc/profile and add the following system variables to your system path. Use nano, gedit or any other text editor, as root, and open up /etc/profile
Type/Copy/Paste: sudo nano /etc/profile
or
Type/Copy/Paste: sudo gedit /etc/profile
11
Scroll down using your arrow keys to the end of the file and add the following lines below to the end of your /etc/profile file in Ubuntu Linux:
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Type/Copy/Paste:
JAVA_HOME=/usr/local/java/jdk1.7.0
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
JAVA_HOME=/usr/local/java/jre1.7.0
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export JAVA_BIN
export PATH
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Save the file and exit.
14
Inform your Ubuntu Linux system where your Oracle Java JDK/JRE is located, now you will want to tell the system Oracle Java 1.7.0 version is available for use.
Type/Copy/Paste: sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jre1.7.0/bin/java" 1
Type/Copy/Paste: sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.7.0/bin/javac" 1
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Inform your Ubuntu Linux system, that Oracle Java JDK/JRE must be the default Java.
Type/Copy/Paste: sudo update-alternatives --set java /usr/local/java/jre1.7.0/bin/java
Type/Copy/Paste: sudo update-alternatives --set javac /usr/local/java/jdk1.7.0/bin/javac
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Also reload your system wide PATH /etc/profile by typing the following command:
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Type/Copy/Paste: . /etc/profile
Note your system wide PATH /etc/profile file will reload after reboot of your Ubuntu Linux system
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You can test to see if Oracle Java was installed correctly on your system by running the following commands and noting the version of Java
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Type/Copy/Paste: java -version
this command displays the version of java running on your system
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You should receive a message which displays:
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)
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Type/Copy/Paste: javac -version
this command lets you know that you are now able to compile java programs from the terminal
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You should receive a message which displays:
javac 1.7.0
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Now, reboot your Ubuntu Linux system and your system will be fully configured for running and developing Java programs.
