How to refilll or reload a jtree in java

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Java

l have 2 JTrees A and B, inside a frame. l fill tree A with computers names gotten through the active directory. When l select a PC in tree A(e.g, lemme say l select PC-1), l get all the folders in the PC-1 and use the folders to fill(create) tree B. It happens that if l select another PC(PC-2), the contents of tree B (that was showing before from PC-1) doesn't clear for the contents of the PC-2 to show(fill) on tree B.

what l want to achieve is that, when l select PC-1 in tree A, it will fill tree B, and when l select PC-2, the tree B contents(by PC-1) will clear for the contents of PC-2 to paint the tree B.

l have tried three different approaches like reloading, repainting, setting to null, none works.

l need a help.

What I have tried:

DefaultTreeModel defMod1 = (DefaultTreeModel)jTree1.getModel();                 
defMod1.reload();
jTree1.repaint();
defMod1.setRoot(null);