安装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'
卸载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
重装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
https://www.jianshu.com/p/c465798391dd
