PreviousWordAction(String nm,
    boolean select) 
{
            super(nm);
            this.select = select;
}

Create this action with the appropriate identifier.

Parameters:

nm - the name of the action, Action.NAME.

select - whether to extend the selection when changing the caret position.

 public  void actionPerformed(ActionEvent e) 
{
            JTextComponent target = getTextComponent(e);
            if (target != null) {
                int offs = target.getCaretPosition();
                boolean failed = false;
                try {
                    Element curPara =
                            Utilities.getParagraphElement(target, offs);
                    offs = Utilities.getPreviousWord(target, offs);
                    if(offs <  curPara.getStartOffset()) {
                        // we should first move to the end of the
                        // previous paragraph (bug #4278839)
                        offs = Utilities.getParagraphElement(target, offs).
                                getEndOffset() - 1;
                    }
                } catch (BadLocationException bl) {
                    if (offs != 0) {
                        offs = 0;
                    }
                    else {
                        failed = true;
                    }
                }
                if (!failed) {
                    if (select) {
                        target.moveCaretPosition(offs);
                    } else {
                        target.setCaretPosition(offs);
                    }
                }
                else {
                    UIManager.getLookAndFeel().provideErrorFeedback(target);
                }
            }
}

The operation to perform when this action is triggered.