/usr/share/geany/templates/files/main.java is in geany-common 1.32-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | {fileheader}
public class {untitled} {
public static void main (String[] args) {
}
}
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