question: public final static boolean isPotentialZipArchive ( String name ) { int lastDot = name . lastIndexOf ( '.' ) ; if ( lastDot == - 1 ) return false ; if ( name . lastIndexOf ( File . separatorChar ) > lastDot ) return false ; int length = name . length ( ) ; int extensionLength = length - lastDot - 1 ; if ( extensionLength == EXTENSION_java . length ( ) ) { for ( int i = extensionLength - 1 ; i >= 0 ; i -- ) { if ( Character . toLowerCase ( name . charAt ( length - extensionLength + i ) ) != EXTENSION_java . charAt ( i ) ) { break ; } if ( i == 0 ) { return false ; } } } if ( extensionLength == EXTENSION_class . length ( ) ) { for ( int i = extensionLength - 1 ; i >= 0 ; i -- ) { if ( Character . toLowerCase ( name . charAt ( length - extensionLength + i ) ) != EXTENSION_class . charAt ( i ) ) { return true ; } } return false ; } return true ; }
target:  Returns whether the given name is potentially a zip archive file name (it has a file extension and it is not ".java" nor ".class")