Some experiences on using jscrollpane

Today, scrollpane is ready for use. It was impossible to add something directly in scrollpane. Instead, you must first set a panelforscroll, then step up it in scrollpane, and then add something to panelforscroll, in order to achieve the rolling effect ~

In addition, layout of scrollpane cannot be set to nulljtable or jtree, which can be directly added to jscrollpane. However, it is better to use jpanel as an intermediary for multiple other components.

Before adding a panel, you must set the preferred size of the Panel. The prefered size you set is the critical point of the scroll bar in jscrollpane. If the preferred size is not set, the default value is (0, 0), that is, no scroll bar will appear no matter how small the Panel is.