1. Download the JDK installation packageJava SE Development Kit download | Oracle 8 – China

2. Agree to the agreement and click start download

3. Log in to your Oracle account. If not, please click the create button below.

4. After downloading it, use your transport tool to transfer it to Linux (here using LZRZSZ mode).

rz
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In 5./usr/local/Create a new one injavaDirectory.

mkdir /usr/local/java
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6. Go to the new onejavaAnd decompress the uploaded Java installation package

CD /usr/local/java tar-xvf (the green JDK installation package you downloaded ended in tar.gz)Copy the code

7. You will get aJDk1.8.0_291Named folder, folder inside the structure is like this

bin	   javafx-src.zip  legal    man		 src.zip
COPYRIGHT  jmc.txt	   lib	    README.html  THIRDPARTYLICENSEREADME-JAVAFX.txt
include    jre		   LICENSE  release	 THIRDPARTYLICENSEREADME.txt
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8. Configure environment variables

vim /etc/profile
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Let’s add it to the last line

Export JAVA_HOME=/usr/local/java/jdk1.8.0_291 export CLASSPATH=$JAVA_HOME/lib export PATH=$PATH:$JAVA_HOME/bin:$CLASSPATHCopy the code

Update profile file

source /etc/profile
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9. Console inputjava, the Java command help prompt is displayed to complete the JDK installation.

java Usage: java [-options] class [args...]  (to execute a class) or java [-options] -jar jarfile [args...]  (to execute a jar file) where options include: -d32 use a 32-bit data model if available -d64 use a 64-bit data model if available -server to select the "server" VM The default VM is server. -cp <class search path of directories and zip/jar files> -classpath <class search path of directories and zip/jar files> A : separated list of directories, JAR archives, and ZIP archives to search for class files. -D<name>=<value> set a system property -verbose:[class|gc|jni] enable verbose output -version print product version and exit -version:<value> Warning: this feature is deprecated and will be removed in a future release. require the specified version to run -showversion print product version and continue -jre-restrict-search | -no-jre-restrict-search Warning: this feature is deprecated and will be removed in a future release. include/exclude user private JREs in the version search -? -help print this help message -X print help on non-standard options -ea[:<packagename>...|:<classname>] -enableassertions[:<packagename>...|:<classname>] enable assertions with specified granularity -da[:<packagename>...|:<classname>] -disableassertions[:<packagename>...|:<classname>] disable assertions with specified  granularity -esa | -enablesystemassertions enable system assertions -dsa | -disablesystemassertions disable system assertions -agentlib:<libname>[=<options>] load native agent library <libname>, e.g. -agentlib:hprof see also, -agentlib:jdwp=help and -agentlib:hprof=help -agentpath:<pathname>[=<options>] load native agent library by full pathname -javaagent:<jarpath>[=<options>] load Java programming language agent, see java.lang.instrument -splash:<imagepath> show splash screen with specified image See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.Copy the code