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JFileChooser fileChooser = new JFileChooser() {
	@Override
	public void approveSelection() {
		File file = getSelectedFile();
		if (file.exists()) {
			if (JOptionPane.showConfirmDialog(this, file.getName() + " ist bereits vorhanden." +
					System.getProperty("line.separator") + "Möchten Sie sie ersetzen?", "Speichern bestätigen",
					JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE) == JOptionPane.YES_OPTION)
				super.approveSelection();
		} else super.approveSelection();
	}
};
if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION)
	//speichern

Parent