Re-Rendering the entire panel with components based on list value selection

Question

Hi,
I am new to swing.Wondering how to refresh the panel with modified data on selection from list.
Here's the code I am trying .
the function below is called withdifferent set of value s being passed in based on add,remove conditions.
public void initGroupPanelComponents(Vector GroupListData,Object[] sourceItemsArray,Object[] sinkItemsArray)
groupsPanel = new JPanel();
groupsPanel.setLayout(null);
botPanel = new JPanel(new BorderLayout());
botPanel.setSize(500,600);
if(sourceItemsArray.length!=0){
sourceLabel = "New Members:";
sinkLabel = "New Available";
System.out.print("color change now!");
groupsPanel.setBackground(Color.YELLOW);
botPanel.setBackground(Color.GRAY);
//revalidate();
else{
groupsPanel.setBackground(Color.BLUE);
botPanel.setBackground(Color.WHITE);
groupsPanel.setSize( 500, 300 );
groupsList = new JList(groupNameListData);
groupsList.setBorder(BorderFactory.createLineBorder(Color.gray));
groupsList.setBounds(10,10,350,230);
groupsPanel.add(groupsList);
groupsList.addListSelectionListener(new groupNameListAction());
groupsList.setListData(groupNameListData);
addButton = new JButton("Add");
addButton.setBounds(385,35,80, 20);
addButton.addActionListener(new addNewGroupAction());
removeButton = new JButton("Remove");
removeButton.setBounds(385, 70, 80, 20);
groupsPanel.add(addButton);
groupsPanel.add(removeButton);
duellist= new DualListPanel(sourceItemsArray, sinkItemsArray, sourceLabel,sinkLabel);
botPanel.add(duellist);
botPanel.setBounds(0, 270, 500,600);
botPanel.setOpaque(true);
getContentPane().add(groupsPanel);
groupsPanel.add(botPanel,BorderLayout.SOUTH);
getContentPane().invalidate();
getContentPane().validate();
setResizable(false);
setVisible(true);
Relevant suggestions are most welcome.
Thanks in Advance!

Answer 1

Thanks much our help.
But,apperars to me that I have added the groupsList to the panel in the method.
What I am trying to acheive here is, when a value is selected from the groupsList, accrodingly,in the ListActionListener, Iam trying to repaint the whole Panel with the list component above and duellist panel (a panel with 2 list components by side and buttons at the centre)obtained from dualListPanel Class .
Appears to work fine the first time when DualListPanel is nstantiated with certain data passed in.But when a particular list value on top is selected, i would require this dualListPanel to be instantiated with a new set of data passed in.This,for some reasons fails to come up.
Would Appreciate if you could suggest accordingly for this.
Thanks much again!