un pathSeparator c'est pas "\\" ou "/", c'est ":" ou ";"
/**
* The system-dependent path-separator character. This field is
* initialized to contain the first character of the value of the system
* property <code>path.separator</code>. This character is used to
* separate filenames in a sequence of files given as a <em>path list</em>.
* On UNIX systems, this character is <code>':'</code>; on Microsoft Windows systems it
* is <code>';'</code>.
*
* @see java.lang.System#getProperty(java.lang.String)
*/
public static final char pathSeparatorChar = fs.getPathSeparator();
/**
* The system-dependent path-separator character, represented as a string
* for convenience. This string contains a single character, namely
* <code>{@link #pathSeparatorChar}</code>.
*/
public static final String pathSeparator = "" + pathSeparatorChar;