How do I check if the Java JDK is installed on Mac?

Question

How do you check if Java SDK is installed on a Mac?

Is there a command line for this?

Answer 1

/usr/bin/java_home tool returns 1 if java not installed.

So you can check if java is installed by the next way:

/usr/libexec/java_home &> /dev/null && echo "installed" || echo  "not installed"