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[英]how does a JTree respond to a changed DefaultMutableTreeNode?
[英]how to have Folder Structure with DefaultMutableTreeNode,JTree
我正在嘗試顯示與父/子相同的文件夾/子文件夾的文件夾結構
但是,我在如何將子級添加到父節點方面很費力,我有一個名為Computerscience的父文件夾,我將其所有子文件夾都添加為子級,當其中有更多子文件夾時,這些子級中的某些子級可以成為父級,似乎我需要遞歸函數,但我無法做到這一點,這是我所做的:
import java.awt.BorderLayout;
import java.io.File;
import java.util.Arrays;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
public class TestTree extends JFrame {
JTree tree;
DefaultTreeModel treeModel;
public TestTree() {
super("Tree Test Example");
setSize(400, 300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
protected String[] getListFiles(String Path) {
File file = new File(Path);
String[] names = file.list();
return names;
}
public void init() {
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Computerscience");
String[] names = this.getListFiles("C:\\Users\\neginn\\Google Drive\\NetBeansProjects\\computerscience");
for (String name : names) {
root.add(new DefaultMutableTreeNode(name));
String[] names_level_2 = this.getListFiles("C:\\Users\\neginn\\Google Drive\\NetBeansProjects\\computerscience\\" + name);
if (names_level_2 != null) {
for (String name_level2 : names_level_2) {
int folder_index = Arrays.asList(names_level_2).indexOf(name_level2);
treeModel.insertNodeInto(root, (DefaultMutableTreeNode) root.getChildAt(folder_index), folder_index);
}
}
}
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
getContentPane().add(tree, BorderLayout.CENTER);
}
public static void main(String args[]) {
TestTree tt = new TestTree();
tt.init();
tt.setVisible(true);
}
}
我的問題是在treeModel.insertNodeInto行中
如您所說,您需要編寫一個遞歸方法。 我試圖寫一個,請在下面測試代碼:
public class TestTree extends JFrame {
JTree tree;
DefaultTreeModel treeModel;
public TestTree() {
super("Tree Test Example");
setSize(400, 300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
protected File[] getListFiles(String Path) {
File file = new File(Path);
return file.listFiles();
}
private void addChilds(DefaultMutableTreeNode rootNode, String path) {
File[] files = this.getListFiles(path);
for(File file:files) {
if(file.isDirectory()) {
DefaultMutableTreeNode subDirectory = new DefaultMutableTreeNode(file.getName());
addChilds(subDirectory, file.getAbsolutePath());
rootNode.add(subDirectory);
} else {
rootNode.add(new DefaultMutableTreeNode(file.getName()));
}
}
}
public void init() {
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Computerscience");
addChilds(root, "C:\\Users\\neginn\\Google Drive\\NetBeansProjects\\computerscience");
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
getContentPane().add(tree, BorderLayout.CENTER);
}
public static void main(String args[]) {
TestTree tt = new TestTree();
tt.init();
tt.setVisible(true);
}
}
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