www.pudn.com > 23种设计模式的java实现.zip > empTree.java

import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 
 
//swing classes 
import javax.swing.text.*; 
import javax.swing.*; 
import javax.swing.event.*; 
import javax.swing.border.*; 
import javax.swing.tree.*; 
 
 
public class empTree extends JxFrame 
   implements TreeSelectionListener 
{ 
   Employee boss, marketVP, prodVP; 
   Employee salesMgr, advMgr; 
   Employee prodMgr, shipMgr; 
 
   JScrollPane sp; 
   JPanel treePanel; 
   JTree tree; 
   DefaultMutableTreeNode troot; 
   JLabel cost; 
    
   public empTree() 
      { 
         super("Employee tree"); 
         makeEmployees(); 
         setGUI(); 
      } 
   //-------------------------------------- 
      private void setGUI() 
      { 
         treePanel = new JPanel(); 
         getContentPane().add(treePanel); 
         treePanel.setLayout(new BorderLayout()); 
          
         sp = new JScrollPane(); 
         treePanel.add("Center", sp); 
         treePanel.add("South", cost = new JLabel("          ")); 
          
         treePanel.setBorder(new BevelBorder(BevelBorder.RAISED)); 
         troot = new DefaultMutableTreeNode(boss.getName()); 
         tree= new JTree(troot); 
         tree.setBackground(Color.lightGray); 
         loadTree(boss); 
         /* Put the Tree in a scroller. */ 
          
         sp.getViewport().add(tree); 
         setSize(new Dimension(200, 300)); 
         setVisible(true); 
 
      } 
      //------------------------------------ 
      public void loadTree(Employee topDog) 
       { 
         DefaultMutableTreeNode troot; 
         troot = new DefaultMutableTreeNode(topDog.getName()); 
         treePanel.remove(tree); 
         tree= new JTree(troot); 
         tree.addTreeSelectionListener(this); 
         sp.getViewport().add(tree); 
          
         addNodes(troot, topDog); 
         tree.expandRow(0); 
         repaint(); 
      } 
      //-------------------------------------- 
      private void addNodes(DefaultMutableTreeNode pnode, Employee emp) 
      { 
      DefaultMutableTreeNode node; 
 
      Enumeration e = emp.elements(); 
        while(e.hasMoreElements()) 
            { 
            Employee newEmp = (Employee)e.nextElement(); 
            node = new DefaultMutableTreeNode(newEmp.getName()); 
            pnode.add(node); 
            addNodes(node, newEmp); 
            } 
      } 
      //-------------------------------------- 
      private void makeEmployees() 
      { 
      boss = new Employee("CEO", 200000); 
      boss.add(marketVP = new Employee("Marketing VP", 100000)); 
      boss.add(prodVP = new Employee("Production VP", 100000)); 
 
      marketVP.add(salesMgr = new Employee("Sales Mgr", 50000)); 
      marketVP.add(advMgr = new Employee("Advt Mgr", 50000)); 
 
      for (int i=0; i<5; i++)  
         salesMgr .add(new Employee("Sales "+new Integer(i).toString(), 30000.0F +(float)(Math.random()-0.5)*10000)); 
      advMgr.add(new Employee("Secy", 20000)); 
 
      prodVP.add(prodMgr = new Employee("Prod Mgr", 40000)); 
      prodVP.add(shipMgr = new Employee("Ship Mgr", 35000)); 
      for (int i = 0; i < 4; i++) 
        prodMgr.add( new Employee("Manuf "+new Integer(i).toString(), 25000.0F +(float)(Math.random()-0.5)*5000)); 
      for (int i = 0; i < 3; i++) 
        shipMgr.add( new Employee("ShipClrk "+new Integer(i).toString(), 20000.0F +(float)(Math.random()-0.5)*5000)); 
         
      }                             
      //-------------------------------------- 
      public void valueChanged(TreeSelectionEvent evt) 
      { 
       TreePath path = evt.getPath(); 
       String selectedTerm = path.getLastPathComponent().toString(); 
 
       Employee emp = boss.getChild(selectedTerm); 
       if(emp != null) 
          cost.setText(new Float(emp.getSalaries()).toString()); 
      } 
      //-------------------------------------- 
      static public void main(String argv[]) 
      { 
         new empTree(); 
      } 
}