java如何引用要添加到二进制树的方法?
我的任务是构建一个表示莫尔斯电码的二进制树。它用每个点向左分支,用每个破折号向右分支
但是,我不明白为什么我添加节点的方法似乎不希望使用BinaryTree对象。IntelliJ说它“无法解析方法”
我确信BinaryTree不是问题所在,因为我的导师给了我关于如何编写课程的详细说明。相反,我怀疑我在这里引用的东西可能是错误的。我已经确认输入的参数不是问题所在
public static MorseCodeTree<Character> readMorseCodeTree()
{
MorseCodeTree<Character> morse = new MorseCodeTree<Character>();
Node<Character> newNode = new Node<Character>(null);
morse.addNode(newNode, letter, position);
private Node<Character> addNode(Node<Character> currentNode, char data, String morseCode)
{
if (currentNode == null)
{
currentNode = new Node(null);
}
if (morseCode.charAt(0) == '*')
{
currentNode = addNode(currentNode.left, data, morseCode.substring(1));
}
else if (morseCode.charAt(0) == '-')
{
currentNode = addNode(currentNode.right, data, morseCode.substring(1));
}
else
{
currentNode.data = data;
}
return currentNode;
}
二进制树类:
导入java。木卫一。可序列化; 导入java。util。扫描仪
公共类二进制树实现了可序列化{
//implement Node class
protected static class Node<E> implements Serializable
{
protected E data;
protected Node<E> left;
protected Node<E> right;
public Node (E data)
{
this.data = data;
this.left = null;
this.right = null;
}
public String toString()
{
return data.toString();
}
}
受保护的节点根
public BinaryTree()
{
root = null;
}
protected BinaryTree(Node<E> root)
{
this.root = root;
}
public BinaryTree(E data, BinaryTree<E> leftTree, BinaryTree<E> rightTree)
{
root = new Node<E>(data);
if (leftTree != null)
{
root.left = leftTree.root;
}
else
{
root.left = null;
}
if (rightTree != null)
{
root.right = rightTree.root;
}
else
{
root.right = null;
}
}
public BinaryTree<E> getLeftSubtree()
{
if (root != null && root.left != null)
{
return new BinaryTree<E>(root.left);
}
else
{
return null;
}
}
public BinaryTree<E> getRightSubtree()
{
if (root != null && root.right != null)
{
return new BinaryTree<E>(root.right);
}
else
{
return null;
}
}
public boolean isLeaf()
{
return (root.left == null && root.right == null);
}
public String toString()
{
StringBuilder sb = new StringBuilder();
preOrderTraverse(root, 1, sb);
return sb.toString();
}
private void preOrderTraverse(Node<E> node, int depth, StringBuilder sb)
{
for (int i = 1; i < depth; i++)
{
sb.append(" ");
}
if (node == null)
{
sb.append("null\n");
}
else
{
sb.append(node.toString() + "\n");
preOrderTraverse(node.left, depth + 1, sb);
preOrderTraverse(node.right, depth + 1, sb);
}
}
public static BinaryTree<String> readBinaryTree(Scanner scan)
{
String data = scan.next();
if (data.equals("null"))
{
return null;
}
else
{
BinaryTree<String> leftTree = readBinaryTree(scan);
BinaryTree<String> rightTree = readBinaryTree(scan);
return new BinaryTree<String>(data, leftTree, rightTree);
}
}
}
# 1 楼答案
您在
readMorseCodeTree()
中声明了addNode(...)
方法,因此它不在类的范围内。后一种方法应该如下所示: