[JAVA] Unsupported major.minor version 52.0 A memorandum when I got hooked

Unsupported major.minor version 52.0 A memorandum when I got hooked

I got stuck in Unsupported major.minor version 52.0.

What is Unsupported major.minor version?

The Java version of the execution environment is old. ➡︎ increase the java version

Then where did you get hooked?

① Check the JDK version with java -version

but is up to date. .. .. why. .. ..

(2) Check the IDE execution environment ➡︎ Since it was an old version, change to the latest version. After the change, the compilation passes.