gridx

问题 I was recently introduced to GridBagLayout to substitute the vanilla JPanel layout, but I am having trouble working with the functions like gridwidth/height and gridx/y. I am not sure how they work exactly in changing the size of the GUI and the positions of the buttons. Below is a code my professor gave me to use for reference, and I tried fiddling with certain numbers but the results never turned out to be what I expected to happen, and I am not sure why. EDIT 1: To clarify, I am wondering

问题 I try to add a button to the last column of my Gridx, however, the button is not shown and above the other table data the grid just says "loading...". Cell Widget is required and declared, widgetInCell is set and onCellWidgetCreated function added. When replacing the onCellWidgetCreated function with alert, an alert message for each row is shown and the "loading..." disappears. My feeling is that the onCellWidgetCreated function is wrong? My code looks like the following and when comparing it