Install Oracle Java through ppa:

Notes:

This is not recommended. It is best to use OpenJDK. OpenJDK is backed by Oracle anyway.
This is for Java JDK 15, replace "15" with what number is current.
This also works on ARM64 architecture (like Raspberry Pi)

To install:

sudo add-apt-repository ppa:linuxuprising/java
sudo apt update
sudo apt install oracle-java17-installer
(agree to terms)
sudo apt install oracle-java17-set-default

To see version, run: java --version

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Source | Date: January 2021
Update (October 5th, 2021): Update from Java 15th to 17th.

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