ubuntu 使用 Java jdk 設定環境

JAVA JDK 原名為 Java SE Development Kit 

為何要安裝這項軟體呢?

如果你要寫 Java 語言的程式碼

這時就需要安裝 Java JDK 

那這又是什麼呢?

簡單來說，這是執行 Java 語言的模擬器

就是這樣.........

那就來進行安裝囉!!

方法一：

方法二：

首先打開終端機( termina ) Ctrl + Alt + T

開始在終端機複製貼上 " ＄ " 要省略喔！！

• $java -version                                              //check system have install Java JDK
• $sudo apt-get purge openjdk-\*                //remove Open JDK/JRE from your system
• $sudo mkdir -p /usr/local/java                  //create a directory to hold your Oracle Java JDK and JRE

Download : http://www.oracle.com/technetwork/java/javase/documentation/java-se-7-doc-download-435117.html

Select :
32-bit : jdk-7u51-linux-i586.tar.gz
64-bit : jdk-7u51-linux-x64.tar.gz

SKIP termina Windows 

32-bit :

• $cd /home/"your_user_name"/Downloads
• $sudo cp -r jdk-7u51-linux-i586.tar.gz /usr/local/java
• $cd /usr/local/java
• $sudo tar xvzf jdk-7u51-linux-i586.tar.gz

64-bit :

• $cd /home/"your_user_name"/Downloads
• $sudo cp -r jdk-7u51-linux-x64.tar.gz /usr/local/java
• $cd /usr/local/java
• $sudo tar xvzf jdk-7u51-linux-x64.tar.gz

• $ls -a
• $sudo gedit /etc/profile   or  $sudo nano /etc/profile

Copy/Paste under line: 

JAVA_HOME=/usr/local/java/jdk1.7.0_51
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export PATH

• $sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.7.0_51/bin/java" 1
•  $sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.7.0_51/bin/javac" 1
•  $sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.7.0_51/bin/javaws" 1
• $sudo update-alternatives --set java /usr/local/java/jdk1.7.0_51/bin/java
• $sudo update-alternatives --set javac /usr/local/java/jdk1.7.0_51/bin/javac
• $sudo update-alternatives --set javaws /usr/local/java/jdk1.7.0_51/bin/javaws
• $. /etc/profile

end  

successful install JAVA JDK