1、查看系统、java安装情况
[root@linuxprobe ~]# cat /etc/system-release Red Hat Enterprise Linux release 8.0 (Ootpa) [root@linuxprobe ~]# java bash: java: command not found... Failed to search for file: Cannot update read-only repo [root@linuxprobe ~]# java -version bash: java: command not found... Failed to search for file: Cannot update read-only repo [root@linuxprobe ~]# which java /usr/bin/which: no java in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
2、下载安装包、给执行权限
下载地址：https://www.oracle.com/java/technologies/javase-jdk15-downloads.html
[root@linuxprobe software]# ls jdk-15_linux-x64_bin_2.rpm [root@linuxprobe software]# chmod 755 jdk-15_linux-x64_bin_2.rpm [root@linuxprobe software]# ll -h total 162M -rwxr-xr-x. 1 root root 162M Oct 17 02:47 jdk-15_linux-x64_bin_2.rpm
3、安装
[root@linuxprobe software]# rpm -ivh jdk-15_linux-x64_bin_2.rpm warning: jdk-15_linux-x64_bin_2.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY Verifying... ################################# [100%] Preparing... ################################# [100%] Updating / installing... 1:jdk-15-2000:15-ga ################################# [100%]
4、检测安装效果
[root@linuxprobe software]# java ## 已经可以调用 Usage: java [options] <mainclass> [args...] (to execute a class) or java [options] -jar <jarfile> [args...] (to execute a jar file) or java [options] -m <module>[/<mainclass>] [args...] java [options] --module <module>[/<mainclass>] [args...] (to execute the main class in a module) [root@linuxprobe software]# java -version java version "15" 2020-09-15 Java(TM) SE Runtime Environment (build 15+36-1562) Java HotSpot(TM) 64-Bit Server VM (build 15+36-1562, mixed mode, sharing) [root@linuxprobe software]# which java /usr/bin/java
5、卸载
[root@linuxprobe software]# rpm -qa | grep jdk jdk-15-15-ga.x86_64 [root@linuxprobe software]# rpm -e --nodeps jdk-15-15-ga.x86_64
6、查看卸载效果
[root@linuxprobe software]# java ## 没问题 -bash: /usr/bin/java: No such file or directory [root@linuxprobe software]# java -version -bash: /usr/bin/java: No such file or directory [root@linuxprobe software]# which java /usr/bin/which: no java in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
参考：https://blog.csdn.net/u010993514/article/details/82926514