The Guide shows you Step-by-Step How to Install and Getting-Started with the Latest Eclipse 2023-03 R IDE for Java SE Development on openSUSE Linux 12.3 GNOME x8664 Desktop.
The Contents and Details are Expressly Essentials to Give Focus Only to the Essentials Instructions and Commands and Make Tut Easier to Read and Digest ;)

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Download Eclipse 2023-03 R IDE for Java:
Eclipse 2023-03 R IDE Java Linux -
Double-Click on Archive and Extract Eclipse into /tmp
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Open Terminal Window
(Press “Enter” to Execute Commands) -
Relocating Eclipse.
su
If Got “User is Not in Sudoers file” then see: How to Enable sudo
sudo chown -R root:root /tmp/eclipse && mv /tmp/eclipse /opt/
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Starting Eclipse from Terminal.
Making a Symlink
ln -s /opt/eclipse/eclipse /usr/local/bin/eclipse
After you can Start Eclipse from Terminal simply with:
eclipse
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Create an Eclipse Desktop Launcher for Easy-Starting:
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Install Recommended Oracle Java SE JDK.