安裝JDK1.8

 161  java 
  162  javac
  175  wget http://download.oracle.com/otn-pub/java/jdk/8u172-b11/a58eab1ec242421181065cdc37240b08/jdk-8u172-linux-x64.tar.gz
  179  java -version
  185  yum -y list java*
  186  yum -y install java-1.8.0-openjdk*
  187  java
  188  java -version
  189  javac
 1001  which java
 1002  cd /usr/bin/java
 1005  whereis java
 1010  history |grep 'java'

卸載JDK1.8

 1010  history |grep 'java'
 1011  java -version
 1012  rpm -qa | grep java
 1013  yum -y remove java-1.8.0-openjdk-debug-1.8.0.161-0.b14.el7_4.x86_64
 1014  java
 1015  javac
 1016  java  -version
 1017  whereis java

重裝JDK10

1053  wget http://download.oracle.com/otn-pub/java/jdk/10.0.1+10/fb4372174a714e6b8c52526dc134031e/jdk-10.0.1_linux-x64_bin.rpm?AuthParam=1528963959_b055445518ac14744deb83aba6dae457
 1057  mkdir /usr/java
 1058  chmod 755 /usr/java/
 1059  mv jdk-10.0.1_linux-x64_bin.rpm /usr/java/
 1060  cd /usr/java/
 1069  rpm -ivh jdk-10.0.1_linux-x64_bin.rpm 
 1070  java -version
 1071  whereis java
 1086  history |grep 'java'

https://blog.csdn.net/hanchao_h/article/details/72762088
http://www.itdecent.cn/p/c465798391dd