Java文件目录管理系统二叉树

实现一个Java文件目录管理系统，可以使用二叉树来存储文件夹和文件信息。

首先，我们可以定义一个节点类，代表二叉树的每个节点：

class Node {
    private String name;  // 文件或文件夹的名称
    private boolean isFile;  // 是否为文件
    private Node left;  // 左子节点
    private Node right;  // 右子节点
    
    public Node(String name, boolean isFile) {
        this.name = name;
        this.isFile = isFile;
        this.left = null;
        this.right = null;
    }

    // getter 和 setter 方法
}

然后，我们可以定义一个二叉树类，包含插入节点、删除节点、查找节点等方法：

class BinaryTree {
    private Node root;  // 根节点

    public BinaryTree() {
        this.root = null;
    }
    
    // 插入节点
    public void insert(String name, boolean isFile) {
        Node newNode = new Node(name, isFile);
        if (root == null) {
            root = newNode;
        } else {
            Node current = root;
            Node parent;
            while (true) {
                parent = current;
                if (name.compareTo(current.getName()) < 0) {
                    current = current.getLeft();
                    if (current == null) {
                        parent.setLeft(newNode);
                        return;
                    }
                } else {
                    current = current.getRight();
                    if (current == null) {
                        parent.setRight(newNode);
                        return;
                    }
                }
            }
        }
    }
    
    // 删除节点
    public boolean delete(String name) {
        Node current = root;
        Node parent = root;
        boolean isLeftChild = true;
        
        while (!current.getName().equals(name)) {
            parent = current;
            if (name.compareTo(current.getName()) < 0) {
                isLeftChild = true;
                current = current.getLeft();
            } else {
                isLeftChild = false;
                current = current.getRight();
            }
            if (current == null) {
                return false;
            }
        }
        
        if (current.getLeft() == null && current.getRight() == null) {
            if (current == root) {
                root = null;
            } else if (isLeftChild) {
                parent.setLeft(null);
            } else {
                parent.setRight(null);
            }
        } else if (current.getRight() == null) {
            if (current == root) {
                root = current.getLeft();
            } else if (isLeftChild) {
                parent.setLeft(current.getLeft());
            } else {
                parent.setRight(current.getLeft());
            }
        } else if (current.getLeft() == null) {
            if (current == root) {
                root = current.getRight();
            } else if (isLeftChild) {
                parent.setLeft(current.getRight());
            } else {
                parent.setRight(current.getRight());
            }
        } else {
            Node successor = getSuccessor(current);
            if (current == root) {
                root = successor;
            } else if (isLeftChild) {
                parent.setLeft(successor);
            } else {
                parent.setRight(successor);
            }
            successor.setLeft(current.getLeft());
        }
        return true;
    }
    
    private Node getSuccessor(Node delNode) {
        Node successorParent = delNode;
        Node successor = delNode;
        Node current = delNode.getRight();
        while (current != null) {
            successorParent = successor;
            successor = current;
            current = current.getLeft();
        }
        if (successor != delNode.getRight()) {
            successorParent.setLeft(successor.getRight());
            successor.setRight(delNode.getRight());
        }
        return successor;
    }
    
    // 查找节点
    public Node find(String name) {
        Node current = root;
        while (!current.getName().equals(name)) {
            if (name.compareTo(current.getName()) < 0) {
                current = current.getLeft();
            } else {
                current = current.getRight();
            }
            if (current == null) {
                return null;
            }
        }
        return current;
    }
}

最后，我们可以使用二叉树来实现文件目录管理系统，例如：

public class FileDirectoryManager {
    private BinaryTree binaryTree;

    public FileDirectoryManager() {
        this.binaryTree = new BinaryTree();
    }
    
    // 新建文件或文件夹
    public void createFileOrFolder(String name, boolean isFile) {
        binaryTree.insert(name, isFile);
    }
    
    // 删除文件或文件夹
    public boolean deleteFileOrFolder(String name) {
        return binaryTree.delete(name);
    }

    // 查找文件或文件夹
    public Node findFileOrFolder(String name) {
        return binaryTree.find(name);
    }
    
    // 其他功能
    // ...
}

当然，这只是一个简单的实现，实际的文件目录管理系统还需要考虑更多的细节和功能。