Content of "JScrollPane"

Question

I want to display an JPanel in an JScrollPane. Usually the JScrollPane-constructor solves this problem:
JScrollPane v1 = new JScrollPane(v0);
It works. But: After the user have changed some settings, another JPanel should be displayed. I'm searching something like JFrame.setContentPane(JPanel).
Does somebody know, wich method I sould use?
Hope I will get some answers,
S.A.