?? demotree.java
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import javax.swing.*;
import javax.swing.tree.*;
public class DemoTree extends JInternalFrame{
public DemoTree(){
super("Demo Tree Structure", true, true, true, true);
DefaultMutableTreeNode manager;
DefaultMutableTreeNode leader;
DefaultMutableTreeNode engineer;
DefaultMutableTreeNode top = new DefaultMutableTreeNode("Empolyee List");
top.add( manager = new DefaultMutableTreeNode("Manager") );
top.add( leader = new DefaultMutableTreeNode("Leader") );
top.add( engineer = new DefaultMutableTreeNode("Engineer") );
manager.add( new DefaultMutableTreeNode("C. Fan") );
manager.add( new DefaultMutableTreeNode("C. Tomas") );
manager.add( new DefaultMutableTreeNode("C. Simth") );
leader.add( new DefaultMutableTreeNode("K. Jacky") );
leader.add( new DefaultMutableTreeNode("M. Shu") );
engineer.add( new DefaultMutableTreeNode("E. Kevin") );
engineer.add( new DefaultMutableTreeNode("H. Alex") );
engineer.add( new DefaultMutableTreeNode("G. J.") );
engineer.add( new DefaultMutableTreeNode("L. Kate") );
engineer.add( new DefaultMutableTreeNode("F. Mike") );
JTree tree = new JTree(top);
JScrollPane treeScroller = new JScrollPane(tree);
treeScroller.setBackground(tree.getBackground());
setContentPane(treeScroller);
setSize( 250, 200);
setLocation( 200, 20);
}//end of DemoTree()
}//end of class DemoTree
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