1. yum list java*
  2. yum list installed | grep java #查看已安装版本
  4. yum -y remove java-1.7.0-openjdk*
  5. yum -y remove java-1.6.0-openjdk*
  7. # jre
  8. yum install java-1.8.0-openjdk.x86_64
  10. # jdk
  11. yum install -y java-1.8.0-openjdk-devel.x86_64
  13. # 配置
  14. sudo vim /etc/profile
  15. source /etc/profile
  16. JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-1.el7_6.x86_64
  17. JRE_HOME=$JAVA_HOME/jre
  18. CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
  19. PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
  20. export JAVA_HOME JRE_HOME CLASS_PATH PATH
  22. java -version

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