the first method
The jdk can be installed with just one command:
- yum install java-1.8.0-openjdk* -y
yum install java-1.8.0-openjdk* -yAfter executing this command, it can be used directly without configuration.
The second method
0. Download jdk8
Login URL: http://www.Oracle.com/technetwork/Java/javase/downloads/jdk8-downloads-2133151.html Select the corresponding jdk version to download. (You can share it to linux through a folder after the download is complete under Windows )
installation steps
1. Log in to Linux and switch to root user
su root to obtain root user permissions, 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 //Enter the usr directory
mkdir java //Create java directory
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 is based on the actual directory
JAVA_HOME=/home/software/jdk1.7
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME PATH CLASSPATH
7. Make the environment variable take effect immediately
: source /etc/profile
sudo shutdown -r now
8. Check the installation
[root@bogon jdk]# java -version
openjdk version "1.8.0_141"
OpenJDK Runtime Environment (build 1.8.0_141-b16)
OpenJDK 64-Bit Server VM (build 25.141-b16, mixed mode)
[root@bogon jdk]# javac -version
javac 1.8.0_141
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