demochangetree.java

java绘图 java awt 经典绘图的例子,对于初学awt模块的人非常有帮助.

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package swing;

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

/**
 *
 * @author zhaolin
 */
public class DemoChangeTree extends JFrame{
    private JButton btInsert,btDelete,btClear;
    private JTree tree;
    public static int newNodeIndex;
    public DemoChangeTree(){
        btInsert = new JButton("添加");
        btInsert.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent e) {
                DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New Node "+newNodeIndex++);
                newNode.setAllowsChildren(true);
                TreePath path = tree.getSelectionPath();
                DefaultMutableTreeNode parent = null;
                if(path == null){
                    parent = (DefaultMutableTreeNode) tree.getModel().getRoot();
                }else{
                    parent = (DefaultMutableTreeNode) path.getLastPathComponent();
                }
                DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
                
                model.insertNodeInto(newNode, parent, parent.getChildCount());
                
                tree.scrollPathToVisible(new TreePath(newNode.getPath()));
            }
            
        });
        btDelete = new JButton("删除");
        btClear = new JButton("清除");
        initTree();
        this.getContentPane().add(new JScrollPane(tree));
        JPanel panel = new JPanel();
        panel.add(btInsert);
        panel.add(btDelete);
        panel.add(btClear);
        panel.setLayout(new GridLayout(3,0));
        this.getContentPane().add(panel,"East");
        this.pack();
        this.setVisible(true);
    }

    private void initTree() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root Node");
        DefaultTreeModel model = new DefaultTreeModel(root);
        tree = new JTree(model);
        tree.setEditable(true);
        model.addTreeModelListener(new TreeModelListener(){

            public void treeNodesChanged(TreeModelEvent e) {
                
            }

            public void treeNodesInserted(TreeModelEvent e) {
                
            }

            public void treeNodesRemoved(TreeModelEvent e) {
                
            }

            public void treeStructureChanged(TreeModelEvent e) {
               
            }
            
        });
    }
    
    public static void main(String[] args) {
        new DemoChangeTree();
    }

}