That error usually means the compiler hit something at the top level that isn’t a class/interface/enum—often caused by one missing/extra brace earlier or code sitting outside a class.

Quick checks:
- The file should contain only: optional package, imports, then one or more class/interface/enum declarations. Nothing else.
- Ensure your main is inside a class and spelled exactly: public static void main(String[] args) (lowercase m).
- Public class name must match the filename (e.g., public class Main -> Main.java).
- No statements at top-level (e.g., System.out.println(...) outside any method/class).
- Look for a stray } or an unclosed /* ... */ comment that “hides” a brace. Use your IDE’s auto-format or structure view to see where the class actually ends.
- Make sure there’s no random text or characters before package/import.

Minimal skeleton to compare against:
public class Main { public static void main(String[] args) { /* your code */ } }

If it still blows up, paste the full file (including package/imports). The first line reporting the error is usually near where the class actually ended early.