功能:1.添加，删除，修改結點。2.更改葉子結點圖示。3.顯示隐藏連接配接線
代碼:
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
public class 實戰 extends JFrame implements ActionListener{
private ImageIcon[] image = new ImageIcon[3];
private JButton button_add;
private JButton button_update;
private JButton button_delete;
private JButton button_change;
private JButton button_display;
private JTextField textField;
private JTree tree;
private DefaultTreeModel treeModel;
private JComboBox comboBox;
private DefaultMutableTreeNode root;
private final JScrollPane scrollPane_1;
private JTextArea textArea;
public 實戰(){
setTitle("樹的綜合應用");
setBounds(100, 100, 400, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel_1 = new JPanel(new FlowLayout(FlowLayout.CENTER,3,3));
JLabel label_1 = new JLabel("節點文字:");
label_1.setFont(new Font("宋體", Font.BOLD, 10));
panel_1.add(label_1);
textField = new JTextField(10);
textField.setFont(new Font("宋體", Font.BOLD, 10));
panel_1.add(textField);
button_add = new JButton("添加");
button_add.setFont(new Font("宋體", Font.BOLD, 10));
panel_1.add(button_add);
button_add.addActionListener(this);
button_update = new JButton("修改");
button_update.setFont(new Font("宋體", Font.BOLD, 10));
panel_1.add(button_update);
button_update.addActionListener(this);
button_delete = new JButton("删除");
button_delete.setFont(new Font("宋體", Font.BOLD, 10));
panel_1.add(button_delete);
button_delete.addActionListener(this);
getContentPane().add(panel_1,BorderLayout.NORTH);
JSplitPane splitPane = new JSplitPane();
splitPane.setDividerLocation(100);
root = new DefaultMutableTreeNode("部門分類");
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("基礎部");
DefaultMutableTreeNode node11 = new DefaultMutableTreeNode("經理");
DefaultMutableTreeNode node12 = new DefaultMutableTreeNode("員工A");
DefaultMutableTreeNode node13 = new DefaultMutableTreeNode("員工B");
node1.add(node11);
node1.add(node12);
node1.add(node13);
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("設計部");
DefaultMutableTreeNode node21 = new DefaultMutableTreeNode("經理");
DefaultMutableTreeNode node22 = new DefaultMutableTreeNode("員工A");
DefaultMutableTreeNode node23 = new DefaultMutableTreeNode("員工B");
node2.add(node21);
node2.add(node22);
node2.add(node23);
root.add(node1);
root.add(node2);
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
TreeSelectionModel selectionModel = tree.getSelectionModel();
selectionModel.setSelectionMode(TreeSelectionModel.CONTIGUOUS_TREE_SELECTION);//設定為連選模式
tree.setFont(new Font("宋體", Font.BOLD, 10));
scrollPane_1 = new JScrollPane();
scrollPane_1.setViewportView(tree);
splitPane.setLeftComponent(scrollPane_1);
final JScrollPane scrollPane_2 = new JScrollPane();
textArea = new JTextArea();
textArea.setFont(new Font("宋體", Font.BOLD, 10));
scrollPane_2.setViewportView(textArea);//顯示單擊結點的路徑
splitPane.setRightComponent(scrollPane_2);
getContentPane().add(splitPane,BorderLayout.CENTER);
JPanel panel_3 = new JPanel(new FlowLayout(FlowLayout.CENTER,3,3));
JLabel label_2 = new JLabel("選擇圖示:");
label_2.setFont(new Font("宋體", Font.BOLD, 10));
panel_3.add(label_2);
for(int i=0;i<3;i++){
image[i] = new ImageIcon(this.getClass().getResource("02-"+(i+1)+".png"));
}
comboBox = new JComboBox(image);
panel_3.add(comboBox);
button_change = new JButton("更改葉子結點圖示");
button_change.setFont(new Font("宋體", Font.BOLD, 10));
panel_3.add(button_change);
button_change.addActionListener(this);
button_display = new JButton("隐藏連接配接線");
button_display.setFont(new Font("宋體", Font.BOLD, 10));
panel_3.add(button_display);
button_display.addActionListener(this);
getContentPane().add(panel_3,BorderLayout.SOUTH);
tree.addTreeSelectionListener(new TreeSelectionListener() {
@Override
public void valueChanged(TreeSelectionEvent e) {
if(!tree.isSelectionEmpty()){
TreePath[] selectionPath = tree.getSelectionPaths();
for(int i=0;i<selectionPath.length;i++){
TreePath treePath = selectionPath[i];
Object[] path = treePath.getPath();
for(int j=0;j<path.length;j++){
DefaultMutableTreeNode node = (DefaultMutableTreeNode) path[j];
textArea.append(node.getUserObject()+(j==(path.length-1)?"":"->"));
}
textArea.append("\n");
}
textArea.append("\n");
}
}
});
}
public static void main(String[] args) {
new 實戰().setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == button_add){//添加
String text = textField.getText();
DefaultMutableTreeNode node = new DefaultMutableTreeNode(text);
TreePath treePath = tree.getSelectionPath();
DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) treePath.getLastPathComponent();
treeModel.insertNodeInto(node, parentNode, parentNode.getChildCount());
TreePath path = treePath.pathByAddingChild(node);
if(!tree.isVisible()){
tree.makeVisible(treePath);
}
}
if(e.getSource() == button_delete){//删除
//待删除的結點
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
if(!node.isRoot()){
DefaultMutableTreeNode nextsilbing = node.getNextSibling();
//如果下一個結點不存在,則選中其父節點
nextsilbing = (DefaultMutableTreeNode) node.getParent();
treeModel.removeNodeFromParent(node);
tree.setSelectionPath(new TreePath(nextsilbing.getPath()));
}
}
if(e.getSource() == button_update){//修改
//得到待修改結點的路徑
TreePath selectionPath = tree.getSelectionPath();
DefaultMutableTreeNode node = (DefaultMutableTreeNode) selectionPath.getLastPathComponent();
// DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
node.setUserObject(textField.getText());
treeModel.nodeChanged(node);
tree.setSelectionPath(selectionPath);
}
if(e.getSource() == button_change){//更改葉子節點的圖示
ImageIcon temp = (ImageIcon) comboBox.getSelectedItem();
DefaultTreeCellRenderer treeCellRenderer = (DefaultTreeCellRenderer) tree.getCellRenderer();
treeCellRenderer.setLeafIcon(temp);
Enumeration enumeration = root.preorderEnumeration();
while(enumeration.hasMoreElements()){
DefaultMutableTreeNode node = (DefaultMutableTreeNode) enumeration.nextElement();
if(node.isLeaf()){
treeModel.nodeChanged(node);
}
}
}
if(e.getActionCommand().equals("隐藏連接配接線")){
System.out.println(button_display.getText());
tree.putClientProperty("JTree.lineStyle", "None");
scrollPane_1.setViewportView(tree);
button_display.setText("顯示連接配接線");
}
if(e.getActionCommand().equals("顯示連接配接線")){
System.out.println(button_display.getText());
tree.putClientProperty("JTree.lineStyle", "Angled");
scrollPane_1.setViewportView(tree);
button_display.setText("隐藏連接配接線");
}
}
}
程式效果如圖:
注意:代碼需要三張圖檔.
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