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The full class name includes the package name: package_play.PP

java -cp ../ package_play.PP

Use the javac command option: -cp to set the classpath for the compile step.
The path to the class file should be <classpath><package>
For example if the path to the class file is =...

When compiling and executing the class file package folder must be on the classpath. The classpath must point to the folder holding the package_play folder.

Copy and paste here the contents of the...