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1. Download the JDK8 installation file
链接:https://pan.baidu.com/s/1fbYP1M38aPwKOPpw6lSVCA
密码:u3au
Or go to the official website to download the new version, click to jump
Note: If you install other versions of Java, you only need to change the version when modifying the environment variables below.
2. Install the JDK file
2.1 Double-click the pkg file to install it
2.2 Check the JDK installation location
Open a terminal window and execute the command:/usr/libexec/java_home -V
2.3 Make sure jdk is installed completely
ls -l /Library/Java/JavaVirtualMachines/jdk1.8.0_212.jdk/Contents/Home/bin/
3. Configure JDK environment variables
3.1 Open the terminal window and open the basic configuration file
If the environment variable is configured for the first time, use " touch .bash_profile" to create a hidden configuration file of .bash_profile.
If the configuration file .bash_profile already exists, use the " open -e .bash_profile" command directly to open the configuration file.
3.2 Configure java environment variables
JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_212.jdk/Contents/Home
PATH=$JAVA_HOME/bin:$PATH:.
CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:.
export JAVA_HOME
export PATH
export CLASSPATH
3.3 Activate configuration
Enter the following command to activate the configuration:
source .bash_profile
Check the Java version:
java -version
3.4 Enter javac and javap to see if the installation is successful
4. Uninstall JDK (any version will do)
4.1 Delete the running path and running environment, etc.
sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -fr /Library/PreferencesPanes/JavaControlPanel.prefPane
sudo rm -fr ~/Library/Application\ Support/Java
4.2 Delete the current version of jdk
sudo rm -rf /Library/Java/JavaVirtualMachines/jdk1.8.0_212.jdk
(Note: If you are not sure about the version number, check the current version first ls /Library/Java/JavaVirtualMachines/)
4.3 Check whether the uninstallation is successful
java -version