1. Log in to Linux and switch to root user
su root to obtain root user authority, the current working directory remains unchanged (requires root password)
or
sudo -i does not require root password to switch directly to root (requires current user password)
2. Create a java installation directory in the usr directory
cd /usr
mkdir java
3. Copy jdk-8u60-linux-x64.tar.gz to the java directory
cp /mnt/hgfs/linux/jdk-8u60-linux-x64.tar.gz /usr/java/
4. Unzip the jdk to the current directory
tar -zxvf jdk-8u60-linux-x64.tar.gz
get the folder jdk1.8.0_60
5. After installation, create a link for him to save directory length
(I didn't use this step)
ln -s /usr/java/jdk1.8.0_60/ /usr/jdk
6. Edit the configuration file and configure environment variables
vim /etc/profile
add the following: JAVA_HOME according to the actual directory
JAVA_HOME=/usr/java/jdk1.8.0_60
CLASSPATH=$JAVA_HOME/lib/
PATH=$PATH:$JAVA_HOME/bin
export PATH JAVA_HOME CLASSPATH
7. Restart the machine or execute the command: source /etc/profile
sudo shutdown -r now
8. Check the installation
java -version
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) Client VM (build 25.60-b23, mixed mode)
Possible error messages:
bash: ./java: cannot execute binary file
The reason for this error may be that a 64-bit jdk is installed on a 32-bit operating system.
Check whether the jdk version and the Linux version have the same number of digits.
Check whether the Ubuntu you installed is 32-bit or 64-bit system:
sudo uname --m
i686 //Indicates that it is 32-bit
x86_64 // Indicates that it is 64-bit
Transfer: http://www.cnblogs.com/shihaiming/p/5809553.html