1.在/usr/local目录下执行：
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wget https://download.oracle.com/java/21/latest/jdk-21_linux-x64_bin.tar.gz |
2.解压
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tar -zxvf jdk-21_linux-aarch64_bin.tar.gz |
3.配置环境变量：vi /etc/profile
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export JAVA_HOME=/usr/local/jdk-21.0.2 export PATH=$JAVA_HOME/bin:$PATH export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar |
4.立即生效
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source /etc/profile |
5.验证
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java -version |
6.软链接
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ln -s /usr/local/jdk-21.0.2/bin/java /usr/bin/java |
参考：https://blog.csdn.net/m0_44974332/article/details/137653503