【答案】应助回帖

% Create a progress bar.
hBar = waitbar ( 0, 'Please Wait....' );
% now use java to get to the progress bar
jFrame = get ( hBar, 'JavaFrame' ); % this will throw a warning
jFigPanel = jFrame.getFigurePanelContainer;
% Now go down through the children of the panel to get the container for the progress bar
jContainer = jFigPanel.getComponent(0);
jPanel = jContainer.getComponent(0);
% Change the location of the panel (ref pixels)
jPanel.setLocation(0,40);
% Change the size of the panel
jPanel.setSize(360,18);
% You then need to repaint and validate for the update to be visible.
jContainer.repaint
jContainer.revalidate