java基础第39课

work167.java

package test09;


import java.awt.BorderLayout;


import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.WindowConstants;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.event.TreeWillExpandListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.ExpandVetoException;
import javax.swing.tree.TreePath;


public class work167 extends JFrame
{


  public work167()
  {
    this.setTitle("树节点展开和折叠事件");
    this.setLayout(new BorderLayout());

    DefaultMutableTreeNode root1 = new DefaultMutableTreeNode("某某企业");
    DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("经理办公室");
    DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("人事部");
    DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("技术部");
    DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("服务部");
    DefaultMutableTreeNode node5 = new DefaultMutableTreeNode("推广部");
    node3.add(new DefaultMutableTreeNode("网络维护部"));
    node3.add(new DefaultMutableTreeNode("应用开发部"));
    node4.add(new DefaultMutableTreeNode("网络服务部"));
    node4.add(new DefaultMutableTreeNode("内勤开发部"));
    root1.add(node1);
    root1.add(node2);
    root1.add(node3);
    root1.add(node4);
    root1.add(node5);
    JTree tree1 = new JTree(root1);
    this.getContentPane().add(tree1,BorderLayout.CENTER);

    //树节点，展开前
    tree1.addTreeWillExpandListener(new TreeWillExpandListener()
    {

      @Override
      public void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException
      {
        TreePath path1 = event.getPath();
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)path1.getLastPathComponent();
        System.out.println("节点<" + node + ">将要展开");

      }

      @Override
      public void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException
      {
        TreePath path1 = event.getPath();
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)path1.getLastPathComponent();
        System.out.println("节点<" + node + ">将要折叠");

      }
    });

    //树节点，展开时
    tree1.addTreeExpansionListener(new TreeExpansionListener()
    {

      @Override
      public void treeExpanded(TreeExpansionEvent event)
      {
        TreePath path1 = event.getPath();
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)path1.getLastPathComponent();
        System.out.println("节点<" + node + ">已经展开");
        System.out.println();
      }

      @Override
      public void treeCollapsed(TreeExpansionEvent event)
      {
        TreePath path1 = event.getPath();
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)path1.getLastPathComponent();
        System.out.println("节点<" + node + ">已经折叠");
        System.out.println();

      }
    });

    this.setSize(500,500);
    this.setVisible(true);
    this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
  }

  public static void main(String[] args)
  {
    work167 s1 = new work167();


  }


}

work168.java