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$ yum install -y wget
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$ wget https://download.oracle.com/java/18/archive/jdk-18.0.2.1_linux-x64_bin.tar.gz

1
$ tar zxvf jdk-18.0.2.1_linux-x64_bin.tar.gz -C /usr/local/

1
$ vim /etc/profile
2
# 新加以下两行环境变量
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export JAVA_HOME=/usr/local/jdk-18.0.2.1
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export PATH=$JAVA_HOME/bin:$PATH
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$ source /etc/profile

1
$ java -version
2
java version "18.0.2.1" 2022-08-18
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Java(TM) SE Runtime Environment (build 18.0.2.1+1-1)
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Java HotSpot(TM) 64-Bit Server VM (build 18.0.2.1+1-1, mixed mode, sharing)
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$ javac -version
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javac 18.0.2.1

1
$ cat >> hello.java << EOF
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public class hello {
3
        public static void main(String[] args) {
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                System.out.println("Hello World");
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        }
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}
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EOF
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$ javac hello.java
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$ ls
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hello.class  hello.java  jdk-18.0.2.1_linux-x64_bin.tar.gz
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$ java hello
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Hello World