JTree中的一个问题

Question

public void valueChanged(TreeSelectionEvent e){}方法我的主类实现了TreeSelectionListener接口

Answer 1

这个是构造方法import javax.swing.*;
import javax.swing.event.TreeSelectionListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.tree.*;
import java.util.Hashtable;
import java.util.HashMap;
import java.util.Enumeration;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;public class DepartmentTree extends JFrame implements TreeSelectionListener {
    private static final int WIDTH = 500;
    private static final int HEIGHT = 350;
    private static final int X = 150;
    private static final int Y = 150;
    private JTree leftTree, rightTree;
    private JPanel leftPanel, rightPanel;
    private String key;
    private String[] value;
    private Hashtable hashTable;    public DepartmentTree() {
        setTitle("DepartmentTree");
        setLocation(X, Y);
        setSize(WIDTH, HEIGHT);        leftTree = new JTree(makeLeftTree());
        leftTree.addTreeSelectionListener(this);
        leftTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);        rightTree = new JTree(makeRightTree());
        rightTree.setShowsRootHandles(true);
        rightTree.setCellRenderer(new MyTreeCellRenderer());
        rightTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        rightTree.addMouseListener(new DepartmentTree.RightNodeSelectionListener(rightTree));
        rightTree.addTreeSelectionListener(this);        leftPanel = new JPanel(new GridLayout(1, 1));
        leftPanel.add(new JScrollPane(leftTree));
        rightPanel = new JPanel(new GridLayout(1, 1));        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());        contentPane.add(leftPanel, BorderLayout.WEST);
        contentPane.add(rightPanel, BorderLayout.CENTER);
    }    public void valueChanged(TreeSelectionEvent e) {        if (leftTree == e.getSource()) {
            try {
                rightPanel.removeAll();
                DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) leftTree.getLastSelectedPathComponent();
                DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) selectedNode.getParent();
                if (selectedNode.isLeaf()) {
                    rightPanel.add(new JScrollPane(rightTree));
                    rightPanel.validate();
                    rightPanel.setVisible(true);
                    key = parentNode.toString() + "  " + selectedNode.toString();
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
        }        if (rightTree == e.getSource()) {
            try {
                CheckBoxNode selectedNode = (CheckBoxNode) rightTree.getLastSelectedPathComponent();
                if (selectedNode.isLeaf()) {
                    String[] value = new String[selectedNode.getParent().getChildCount()];
                    CheckBoxNode fristLeaf = (CheckBoxNode) selectedNode.getFirstLeaf();                    value[0] = String.valueOf(fristLeaf.isSelected());
                    while (selectedNode.getNextLeaf() != null) {
                        for (int i = 1; i < value.length; i++) {
                            if (selectedNode.getNextLeaf().equals(selectedNode)) {
                                value[i] = String.valueOf(!(selectedNode.isSelected()));
                            }
                            value[i] = String.valueOf(selectedNode.getNextLeaf());                        }
                    }                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
        }
}

Answer 2

还有就是上边的构造方法错了
应该是这个
import javax.swing.*;
import javax.swing.event.TreeSelectionListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.tree.*;
import java.util.Hashtable;
import java.util.HashMap;
import java.util.Enumeration;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;public class DepartmentTree extends JFrame implements TreeSelectionListener {
    private static final int WIDTH = 500;
    private static final int HEIGHT = 350;
    private static final int X = 150;
    private static final int Y = 150;
    private JTree leftTree, rightTree;
    private JPanel leftPanel, rightPanel;
    private String key;
    private String[] value;
    private Hashtable hashTable;    public DepartmentTree() {
        setTitle("DepartmentTree");
        setLocation(X, Y);
        setSize(WIDTH, HEIGHT);        leftTree = new JTree(makeLeftTree());
        leftTree.addTreeSelectionListener(this);
        leftTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);        rightTree = new JTree(makeRightTree());
        rightTree.setShowsRootHandles(true);
        rightTree.setCellRenderer(new MyTreeCellRenderer());
        rightTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        rightTree.addMouseListener(new DepartmentTree.RightNodeSelectionListener(rightTree));
        rightTree.addTreeSelectionListener(this);        leftPanel = new JPanel(new GridLayout(1, 1));
        leftPanel.add(new JScrollPane(leftTree));
        rightPanel = new JPanel(new GridLayout(1, 1));        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());        contentPane.add(leftPanel, BorderLayout.WEST);
        contentPane.add(rightPanel, BorderLayout.CENTER);
    }    public void valueChanged(TreeSelectionEvent e) {
        if (leftTree == e.getSource()) {
            try {
                rightPanel.removeAll();
                DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) leftTree.getLastSelectedPathComponent();
                DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) selectedNode.getParent();
                if (selectedNode.isLeaf()) {
                    rightPanel.add(new JScrollPane(rightTree));
                    rightPanel.validate();
                    rightPanel.setVisible(true);
                    key = parentNode.toString() + "  " + selectedNode.toString();
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
        }        if (rightTree == e.getSource()) {
            try {
                hashTable = new Hashtable();
                CheckBoxNode selectedNode = (CheckBoxNode) rightTree.getLastSelectedPathComponent();
                CheckBoxNode parentNode = (CheckBoxNode) selectedNode.getParent();
                Enumeration enum = parentNode.children();
                if (selectedNode.isLeaf()) {
                    value = new String[parentNode.getChildCount()];
                    while (enum.hasMoreElements()) {
                        for (int j = 0; j < value.length; j++) {
                            value[j] = (parentNode.toString() + "  " +
                                    String.valueOf(((CheckBoxNode) enum.nextElement()).isSelected));
                        }
                    }
                    System.out.println("\n key " + key);
                    for (int i = 0; i < value.length; i++) {
                        System.out.print(value[i]);
                    }
                    hashTable.put(key, value);
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
        }
}