Previously, we installed Java on the Tencent cloud server we just bought, but found that there was no Javac command after the installation, so we uninstalled the re-installation link: juejin.cn/post/691280…

We re-installed the yum command with an extra *

Yum -y install Java -- 1.8.0 comes with its *Copy the code

Oddly, the environment variables still need to be configured. We open profiles using Vim:

vim /etc/profile
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Use shift+ G to jump to the end of the file add:

#set Java environment JAVA_HOME=/usr/lib/ jre-1.8.0-openJDk.x86_64 PATH=$PATH:$JAVA_HOME/bin CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export JAVA_HOME CLASSPATH PATHCopy the code

At this point, run the command to view the Java version

java -version
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Successful installation

Create a new helloWorld.java file in the custom directory

vim HelloWorld.java
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Write code:

public class HelloWorld{ public static void main(String[] args){ System.out.println("hello world"); }}Copy the code

Save the configuration and run the following command:

javac HelloWorld.java
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After success, a helloWorld.class file is found in the directory and the command continues

java HelloWorld
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Execute successfully, print out

hello world
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