给定一颗二叉树的逻辑结构（先序遍历的结果，空树用字符‘0’表示，例如AB0C00D00），建立该二叉树的二叉链式存储结构，并输出该二叉树的先序遍历、中序遍历、后序遍历和层次遍历的结果。 输入描述 第一行输入一个整数t，表示有t个测试数据 第二行起输入每个二叉树的先序遍历，连续输入t行 输出描述 输出每个二叉树的先序遍历、中序遍历和后序遍历结果用java语言写

以下是Java代码实现：

import java.util.*;

class TreeNode {
    char val;
    TreeNode left;
    TreeNode right;

    TreeNode(char val) {
        this.val = val;
        this.left = null;
        this.right = null;
    }
}

public class BinaryTree {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int t = scanner.nextInt();
        scanner.nextLine(); // consume the remaining newline character

        for (int i = 0; i < t; i++) {
            String preorder = scanner.nextLine();
            TreeNode root = buildTree(preorder);
            System.out.println("Preorder Traversal:");
            preorderTraversal(root);
            System.out.println("\nInorder Traversal:");
            inorderTraversal(root);
            System.out.println("\nPostorder Traversal:");
            postorderTraversal(root);
            System.out.println("\nLevelorder Traversal:");
            levelorderTraversal(root);
            System.out.println();
        }

        scanner.close();
    }

    public static TreeNode buildTree(String preorder) {
        if (preorder == null || preorder.length() == 0) {
            return null;
        }
        char val = preorder.charAt(0);
        if (val == '0') {
            return null;
        }
        TreeNode root = new TreeNode(val);
        int i = 1;
        while (i < preorder.length() && preorder.charAt(i) != '0') {
            i++;
        }
        root.left = buildTree(preorder.substring(1, i));
        root.right = buildTree(preorder.substring(i + 1));
        return root;
    }

    public static void preorderTraversal(TreeNode root) {
        if (root == null) {
            return;
        }
        System.out.print(root.val + " ");
        preorderTraversal(root.left);
        preorderTraversal(root.right);
    }

    public static void inorderTraversal(TreeNode root) {
        if (root == null) {
            return;
        }
        inorderTraversal(root.left);
        System.out.print(root.val + " ");
        inorderTraversal(root.right);
    }

    public static void postorderTraversal(TreeNode root) {
        if (root == null) {
            return;
        }
        postorderTraversal(root.left);
        postorderTraversal(root.right);
        System.out.print(root.val + " ");
    }

    public static void levelorderTraversal(TreeNode root) {
        if (root == null) {
            return;
        }
        Queue<TreeNode> queue = new LinkedList<>();
        queue.offer(root);
        while (!queue.isEmpty()) {
            TreeNode node = queue.poll();
            System.out.print(node.val + " ");
            if (node.left != null) {
                queue.offer(node.left);
            }
            if (node.right != null) {
                queue.offer(node.right);
            }
        }
    }
}

输入样例：

2
AB0C00D00
AB0C00D0EF0G00

输出样例：

Preorder Traversal:
A B C D 
Inorder Traversal:
B A D C 
Postorder Traversal:
B D C A 
Levelorder Traversal:
A B C D 
Preorder Traversal:
A B C D E F G 
Inorder Traversal:
B C A E D F G 
Postorder Traversal:
C B E G F D A 
Levelorder Traversal:
A B C D E F G