Search:

JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);

home.panel_tabella_vendi.setPreferredSize(new Dimension(0, 150));
JPanel sotto = new JPanel();

...

When I drag the JSplitPane I want it to stop at a certain point... how do I do that? Thank you
It can stretch horizontally as much as it pleases but when I grag it vertically I want it to stop at a...