If you purchased a new Mac device (Macbook, iMac, Mac mini) and try running java or javac command in Terminal you will get the below error as there is no Java Runtime pre-installed.
[email protected] ~ % java
The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com for information on installing Java.
[email protected] ~ % javac
The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com for information on installing Java.

Unable to locate Java Runtime macOS Error
You need to visit http://www.java.com and download java dmg setup and install.
Note: Oracle Java is not yet available for MacBooks/Mac Mini's that are running on Apple Silicon M1 Chips, this setup will work using Rosetta 2 - which will convert the code for you!
Intel-based Mac running Mac OS X 10.7.3 (Lion) or later.
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