File	Doc	Category	Size	Date	Package
ExprTree1.java	API Doc	Example	2519	Mon Nov 09 12:45:50 GMT 1998	None

ExprTree1

• java.lang.Object
  • java.awt.Component
    • java.awt.Container
      • java.awt.Window
        • java.awt.Frame
          • javax.swing.JFrame

Fields Summary
JTree	tree
ExpressionTreeModel	treeModel
OpNode[]	operators
Integer[]	operands

Constructors Summary
public ExprTree1() super("Demo Expression Tree"); setSize(400, 300); addWindowListener(new BasicWindowMonitor());

Methods Summary
public void	init() // create the nodes and the leaves operators[0] = new OpNode("+"); operators[1] = new OpNode("*"); operators[2] = new OpNode("-"); operators[3] = new OpNode("/"); operands[0] = new Integer(1); operands[1] = new Integer(2); operands[2] = new Integer(3); operands[3] = new Integer(4); operands[4] = new Integer(5); // start our tree with a root of "+" treeModel = new ExpressionTreeModel(operators[0]); // build the tree from the root down treeModel.insertNode(operators[0], operands[0], 0); treeModel.insertNode(operators[0], operators[1], 1); treeModel.insertNode(operators[1], operators[2], 0); treeModel.insertNode(operators[1], operators[3], 1); treeModel.insertNode(operators[2], operands[1], 0); treeModel.insertNode(operators[2], operands[2], 1); treeModel.insertNode(operators[3], operands[3], 0); treeModel.insertNode(operators[3], operands[4], 1); tree = new JTree(treeModel); tree.setShowsRootHandles(true); tree.collapseRow(0); // Listen to our own expand/collapse events to keep the labels in sync tree.addTreeExpansionListener(this); getContentPane().add(tree, BorderLayout.CENTER);
public static void	main(java.lang.String[] args) ExprTree1 et = new ExprTree1(); et.init(); et.setVisible(true);
public void	treeCollapsed(javax.swing.event.TreeExpansionEvent tee) OpNode node = (OpNode)tee.getPath().getLastPathComponent(); node.setExpanded(false); treeModel.refresh(tee);
public void	treeExpanded(javax.swing.event.TreeExpansionEvent tee) OpNode node = (OpNode)tee.getPath().getLastPathComponent(); node.setExpanded(true); treeModel.refresh(tee);