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"if your supposed to copy the java code where you to paste the java code?"

Paste into notepad then save as JSX in Presets > Scripts folder. Restart Photoshop and script should appear in File > Scripts. Otherwise save script anywhre then use File > Scripts > Browse and navigate to script.

"Is this the only way to apply an action on mutliple layers by the way?"

Yes, there isn't built in option. You can run action on each and every layer or to try with Conditional actions but that is complex. The problem is that you can not tell through condition to not apply action twice to the same layer so you must have exact or matching number of conditional steps. Another option is to go through layers and apply same steps but again you must have matching number of select next layer and layers in the Layers panel.