How to trigger an ActionListener in different class on click of a tree node

Question

Hi guyz,
There are three panels inside my main Frame
-->TopPanel,MiddlePanel and BottomPanel. I have a tree structure inside a panel. This panel along with couple more panels is in MiddlePanel. My main class is "mainClass.java". Inside that i have an actionListener for a specific button. I need to trigger that actionListener when i click one of the tree nodes in the panel i specified before. The problem is that my MiddlePanel is itself a different ".java" file which is being called in my "mainClass" when a specific button is clicked. There are different buttons in my "mainClass" file and for each one i am creating different MiddlePanels depending on the buttons clicked.
So, if i click the tree node, i need to remove the MiddlePanel and recreate the MiddlePanel(One that will be created when a different button in the mainClass file is clicked). i.e., i need to trigger the actionListener for that corresponding button. Is there a way to do it?

Answer 1

use this code to call different panel by selecting tree node.....ok
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.sql.SQLException;
import javax.swing.event.*;
class MainTree extends JFrame
private static final long serialVersionUID = 1L;
     CardLayout cl = new CardLayout();
     JPanel panel = new JPanel(cl);
public MainTree() throws Exception
JPanel blankPanel = new JPanel();
blankPanel.setBorder(BorderFactory.createTitledBorder("Blank Panel"));
panel.add(blankPanel,"0");
panel.add(blankPanel,BorderLayout.CENTER);
     panel.setPreferredSize(new Dimension(800, 100));
     setSize(1000, 700);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// getContentPane().setLayout(new GridLayout(1,2));
getContentPane().setLayout(new BorderLayout());
ConfigTree test = new ConfigTree();
DefaultMutableTreeNode mainTree = (DefaultMutableTreeNode)test.buildTree();
JTree tree = new JTree(mainTree);
tree.setCellRenderer(new DefaultTreeCellRenderer(){
private static final long serialVersionUID = 1L;
     public Component getTreeCellRendererComponent(JTree tree,Object value,
boolean sel,boolean expanded,boolean leaf,int row,boolean hasFocus){
JLabel lbl = (JLabel)super.getTreeCellRendererComponent(tree,value,sel,expanded,leaf,row,hasFocus);
NodeWithID node = (NodeWithID)((DefaultMutableTreeNode)value).getUserObject();
if(node.icon != null)lbl.setIcon(node.icon);
return lbl;
getContentPane().add(new JScrollPane(tree));
loadCardPanels((DefaultMutableTreeNode)((DefaultTreeModel)tree.getModel()).getRoot());
getContentPane().add(panel,BorderLayout.EAST);
     getContentPane().add(blankPanel,BorderLayout.WEST);
// getContentPane().add(panel);
tree.addTreeSelectionListener(new TreeSelectionListener(){
public void valueChanged(TreeSelectionEvent tse){
NodeWithID node =(NodeWithID)((DefaultMutableTreeNode)((TreePath)tse.getPath())
.getLastPathComponent()).getUserObject();
if(node.nodePanel != null)
String cardLayoutID = node.ID;
cl.show(panel,cardLayoutID);
cl.show(panel,"0");
public void loadCardPanels(DefaultMutableTreeNode dmtn)
for(int x = 0; x < dmtn.getChildCount(); x++)
if(((DefaultMutableTreeNode)dmtn.getChildAt(x)).isLeaf() == false)
loadCardPanels((DefaultMutableTreeNode)dmtn.getChildAt(x));
NodeWithID node = (NodeWithID)((DefaultMutableTreeNode)dmtn.getChildAt(x)).getUserObject();
if(node.nodePanel != null)
String cardLayoutID = node.ID;
panel.add(cardLayoutID,node.nodePanel);
public static void main(String[] args) throws Exception{new MainTree().setVisible(true);}
class ConfigTree
public Object buildTree() throws Exception
NodeWithID n0 = new NodeWithID("HelpDesk","");
NodeWithID n1 = new NodeWithID("Administrator",n0.nodeName);
NodeWithID n2 = new NodeWithID("Report Form",n1.nodeName,new Tree().getContentPane());
NodeWithID n3 = new NodeWithID("Create User",n2.nodeName,new JPanel());
NodeWithID n4 = new NodeWithID("Unlock User",n2.nodeName,new unlockui().getContentPane());
NodeWithID n5 = new NodeWithID("List User",n2.nodeName,new JPanel());
NodeWithID n6 = new NodeWithID("Assign Role",n2.nodeName,new AssignRole());
NodeWithID n9 = new NodeWithID("Operator",n1.nodeName,new JPanel());
NodeWithID n10 = new NodeWithID("Create Ticket",n9.nodeName,new JPanel());
NodeWithID n11 = new NodeWithID("My Ticket",n9.nodeName,new JPanel());
NodeWithID n12 = new NodeWithID("All Ticket",n9.nodeName,new JPanel());
NodeWithID n13 = new NodeWithID("Event Viewer",n1.nodeName,new JPanel());
DefaultMutableTreeNode top = new DefaultMutableTreeNode(n0);
DefaultMutableTreeNode branch1 = new DefaultMutableTreeNode(n1);
top.add(branch1);
DefaultMutableTreeNode node1_b1 = new DefaultMutableTreeNode(n2);
DefaultMutableTreeNode n1_node1_b1 = new DefaultMutableTreeNode(n3);
DefaultMutableTreeNode n2_node1_b1 = new DefaultMutableTreeNode(n4);
DefaultMutableTreeNode n3_node1_b1 = new DefaultMutableTreeNode(n5);
DefaultMutableTreeNode n4_node1_b1 = new DefaultMutableTreeNode(n6);
branch1.add(node1_b1);
branch1.add(n1_node1_b1);
branch1.add(n2_node1_b1);
branch1.add(n3_node1_b1);
branch1.add(n4_node1_b1);
DefaultMutableTreeNode node4_b1 = new DefaultMutableTreeNode(n9);
DefaultMutableTreeNode n1_node4_b1 = new DefaultMutableTreeNode(n10);
DefaultMutableTreeNode n2_node4_b1 = new DefaultMutableTreeNode(n11);
DefaultMutableTreeNode n3_node4_b1 = new DefaultMutableTreeNode(n12);
node4_b1.add(n1_node4_b1);
node4_b1.add(n2_node4_b1);
node4_b1.add(n3_node4_b1);
DefaultMutableTreeNode node5_b1 = new DefaultMutableTreeNode(n13);
branch1.add(node1_b1);
branch1.add(node4_b1);
branch1.add(node5_b1);
return top;
class NodeWithID
String nodeName;
String ID;
JPanel nodePanel;
ImageIcon icon;
public NodeWithID(String nn,String parentName)
nodeName = nn;
ID = parentName+" - "+nodeName;
public NodeWithID(String nn,String parentName,Container container)
this(nn,parentName);
nodePanel = (JPanel) container;
nodePanel.setBorder(BorderFactory.createTitledBorder(ID + " Panel"));
public NodeWithID(String nn,String parentName,JPanel p, ImageIcon i)
this(nn,parentName,p);
icon = i;
public String toString(){return nodeName;}
}