It allows switching between Java versions and sets JAVA_HOME for you. I suggest not modifying JAVA_HOME, because in a few months when you want to switch your java version, java_home will still show you which versions you have on your machine. Also, if that path is broken, no versions show up. MKYong modifies JAVA_HOME to change the java version, and this will hide all other JAVA versions from being listed in /usr/libexec/java_home -V. He doesn't use jenv because of 'simplicity and no black box magic'. I noticed MKYong's method uses brew to install java JDK versions (recommended by OpenJDK) and then sets JAVA_HOME explicitly. Setting up Java/ JAVA_HOME happens infrequently enough that I forgot how to do it efficiently, but frequent enough that it is annoying.

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