一，以Root身份登入CentOS 7：比较简单是使用Root身份进行操作，下面是如何 。
https://www.cnblogs.com/sunylat/p/11236845.html
二，安装Eclipse。
Prerequisites
Open a terminal (Applications >> System Tools >> Terminal) and then switch to root user.
$ su -
Install Java
Before installing Eclipse, make sure you have installed JDK on your machine. You can either install Oracle JDK or OpenJDK.
For this post, I will use OpenJDK 8 here.
yum -y install java-1.8.0-openjdk
Verify the Java version on your machine.
java -version
Output:
openjdk version "1.8.0_212" OpenJDK Runtime Environment (build 1.8.0_212-b04) OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)
Install Eclipse
Download latest eclipse package (v2019-03) over from the official page using a web browser.
OR
Download the Eclipse package over a terminal using the following command (risk of being changed).
wget http://ftp.jaist.ac.jp/pub/eclipse/technology/epp/downloads/release/2019-03/R/eclipse-java-2019-03-R-linux-gtk-x86_64.tar.gz
Extract the Eclipse package to your desired directory (/opt).
tar -zxvf eclipse-java-2019-03-R-linux-gtk-x86_64.tar.gz -C /opt
Symlink the Eclipse executable to /usr/bin path so all users in your system can use Eclipse IDE.
ln -sf /opt/eclipse/eclipse /usr/bin/eclipse
Setup Eclipse Menu Entry
Create a Gnome launcher.
vi /usr/share/applications/eclipseide.desktop
Place the following content in the above file.
[Desktop Entry] Encoding=UTF-8 Name=Eclipse IDE Comment=Eclipse IDE Exec=/usr/bin/eclipse Icon=/opt/eclipse/icon.xpm Categories=Application;Development Version=1.0 Type=Application Terminal=0
注意问题：Desktop Entry，必须是这些文字，区分大小写，如果不是这个名字，可能不会在菜单里面出现，我就因为这个Desktop写成了desktop，结果图标没能出现在菜单里。
Start Eclipse
Command line
eclipse
Graphical Mode
Go to Application >> Programming >> Eclipse.
参考：