How to add JTree dynamically to a created JScrollPane?

Question

MY Jtree component is created within a actionperformed function. But I've already created a Jscrollpane in the constructor and added it to the JFrame.

Now within the actionperformed function, I tried to add the dynamically created JTree to the JScrollpane using

JScrollpaneobject.add(JtreeObject);
JScrollpaneobject.revalidate();

But I am unable to see the Jtree on the Jscrollpane.

Answer 1

直接变体：

 scroll.setViewportView(jTree)

Answer 2

scroll.getViewport（）。添加（JTree的）