当我尝试打印以打印数据时，我收到此错误消息：无法找到符号。 以下是我的方法
public int heightOfBinaryTree(Node node) {
if (node == null) {
return 0;
} else {
return 1
+ Math.max(heightOfBinaryTree(node.left),
heightOfBinaryTree(node.right));
}
}
这是我在主要
中的印刷品 System.out.println(Math.max(heightOfBinaryTree(node.left)));
完整代码
public class Binaireboom<Key extends Comparable<Key>, Value> {
private Node root; // root of BST
private class Node {
private Key key; // sorted by key
private Value val; // associated data
private Node left, right; // left and right subtrees
private int N; // number of nodes in subtree
private int aantal;
int height;
public Node(Key key, Value val, int N, int aantal) {
this.key = key;
this.val = val;
this.N = N;
this.aantal = aantal;
}
}
/**
* Initializes an empty symbol tables.
*/
public Binaireboom() {
}
/**
* Returns true if this symbol tables is empty.
*
* @return <tt>true</tt> if this symbol tables is empty; <tt>false</tt>
* otherwise
*/
public boolean isEmpty() {
return size() == 0;
}
/**
* Returns the number of key-value pairs in this symbol tables.
*
* @return the number of key-value pairs in this symbol tables.
*/
public int size() {
return size(root);
}
// return number of key-value pairs in BST rooted at x
private int size(Node x) {
if (x == null) {
return 0;
} else {
return x.N;
}
}
/**
* Does this symbol tables contain the given key?
*
* @param key the key
* @return <tt>true</tt> if this symbol tables contains <tt>key</tt> and
* <tt>false</tt> otherwise
* @throws NullPointerException if <tt>key</tt> is <tt>null</tt>
*/
public boolean contains(Key key) {
if (key == null) {
throw new NullPointerException("argument to contains() is null");
}
return get(key) != null;
}
/**
* Returns the value associated with the given key.
*
* @param key the key
* @return the value associated with the given key if the key is in the
* symbol tables and <tt>null</tt> if the key is not in the symbol tables
* @throws NullPointerException if <tt>key</tt> is <tt>null</tt>
*/
public Value get(Key key) {
return get(root, key);
}
private Value get(Node x, Key key) {
if (x == null) {
return null;
}
int cmp = key.compareTo(x.key);
if (cmp < 0) {
return get(x.left, key);
} else if (cmp > 0) {
return get(x.right, key);
} else {
return x.val;
}
}
public int getAantal(Key key) {
return getAantal(root, key);
}
private int getAantal(Node x, Key key) {
if (x == null) {
return 0;
}
int cmp = key.compareTo(x.key);
if (cmp < 0) {
return getAantal(x.left, key);
} else if (cmp > 0) {
return getAantal(x.right, key);
} else {
return x.aantal;
}
}
/**
* Inserts the specified key-value pair into the symbol tables, overwriting
* the old value with the new value if the symbol tables already contains
* the specified key. Deletes the specified key (and its associated value)
* from this symbol tables if the specified value is <tt>null</tt>.
*
* @param key the key
* @param val the value
* @throws NullPointerException if <tt>key</tt> is <tt>null</tt>
*/
public void put(Key key, Value val) {
if (key == null) {
throw new NullPointerException("first argument to put() is null");
}
if (val == null) {
delete(key);
return;
}
root = put(root, key, val);
assert check();
}
private Node put(Node x, Key key, Value val) {
if (x == null) {
return new Node(key, val, 1, 1);
}
int cmp = key.compareTo(x.key);
if (cmp < 0) {
x.left = put(x.left, key, val);
} else if (cmp > 0) {
x.right = put(x.right, key, val);
} else if (cmp == 0) {
x.aantal++;
} else {
x.val = val;
}
x.N = 1 + size(x.left) + size(x.right);
return x;
}
/**
* Removes the smallest key and associated value from the symbol tables.
*
* @throws NoSuchElementException if the symbol tables is empty
*/
public void deleteMin() {
if (isEmpty()) {
throw new NoSuchElementException("Symbol tables underflow");
}
root = deleteMin(root);
assert check();
}
private Node deleteMin(Node x) {
if (x.left == null) {
return x.right;
}
x.left = deleteMin(x.left);
x.N = size(x.left) + size(x.right) + 1;
return x;
}
/**
* Removes the largest key and associated value from the symbol tables.
*
* @throws NoSuchElementException if the symbol tables is empty
*/
public void deleteMax() {
if (isEmpty()) {
throw new NoSuchElementException("Symbol tables underflow");
}
root = deleteMax(root);
assert check();
}
private Node deleteMax(Node x) {
if (x.right == null) {
return x.left;
}
x.right = deleteMax(x.right);
x.N = size(x.left) + size(x.right) + 1;
return x;
}
/**
* Removes the specified key and its associated value from this symbol
* tables (if the key is in this symbol tables).
*
* @param key the key
* @throws NullPointerException if <tt>key</tt> is <tt>null</tt>
*/
public void delete(Key key) {
if (key == null) {
throw new NullPointerException("argument to delete() is null");
}
root = delete(root, key);
assert check();
}
private Node delete(Node x, Key key) {
if (x == null) {
return null;
}
int cmp = key.compareTo(x.key);
if (cmp < 0) {
x.left = delete(x.left, key);
} else if (cmp > 0) {
x.right = delete(x.right, key);
} else {
if (x.right == null) {
return x.left;
}
if (x.left == null) {
return x.right;
}
Node t = x;
x = min(t.right);
x.right = deleteMin(t.right);
x.left = t.left;
}
x.N = size(x.left) + size(x.right) + 1;
return x;
}
/**
* Returns the smallest key in the symbol tables.
*
* @return the smallest key in the symbol tables
* @throws NoSuchElementException if the symbol tables is empty
*/
public Key min() {
if (isEmpty()) {
throw new NoSuchElementException("called min() with empty symbol tables");
}
return min(root).key;
}
private Node min(Node x) {
if (x.left == null) {
return x;
} else {
return min(x.left);
}
}
/**
* Returns the largest key in the symbol tables.
*
* @return the largest key in the symbol tables
* @throws NoSuchElementException if the symbol tables is empty
*/
public Key max() {
if (isEmpty()) {
throw new NoSuchElementException("called max() with empty symbol tables");
}
return max(root).key;
}
private Node max(Node x) {
if (x.right == null) {
return x;
} else {
return max(x.right);
}
}
/**
* Returns the largest key in the symbol tables less than or equal to
* <tt>key</tt>.
*
* @param key the keys
* @return the largest key in the symbol tables less than or equal to
* <tt>key</tt>
* @throws NoSuchElementException if there is no such key
* @throws NullPointerException if <tt>key</tt> is <tt>null</tt>
*/
public Key floor(Key key) {
if (key == null) {
throw new NullPointerException("argument to floor() is null");
}
if (isEmpty()) {
throw new NoSuchElementException("called floor() with empty symbol tables");
}
Node x = floor(root, key);
if (x == null) {
return null;
} else {
return x.key;
}
}
private Node floor(Node x, Key key) {
if (x == null) {
return null;
}
int cmp = key.compareTo(x.key);
if (cmp == 0) {
return x;
}
if (cmp < 0) {
return floor(x.left, key);
}
Node t = floor(x.right, key);
if (t != null) {
return t;
} else {
return x;
}
}
/**
* Returns the smallest key in the symbol tables greater than or equal to
* <tt>key</tt>.
*
* @param key the keys
* @return the smallest key in the symbol tables greater than or equal to
* <tt>key</tt>
* @throws NoSuchElementException if there is no such key
* @throws NullPointerException if <tt>key</tt> is <tt>null</tt>
*/
public Key ceiling(Key key) {
if (key == null) {
throw new NullPointerException("argument to ceiling() is null");
}
if (isEmpty()) {
throw new NoSuchElementException("called ceiling() with empty symbol tables");
}
Node x = ceiling(root, key);
if (x == null) {
return null;
} else {
return x.key;
}
}
private Node ceiling(Node x, Key key) {
if (x == null) {
return null;
}
int cmp = key.compareTo(x.key);
if (cmp == 0) {
return x;
}
if (cmp < 0) {
Node t = ceiling(x.left, key);
if (t != null) {
return t;
} else {
return x;
}
}
return ceiling(x.right, key);
}
/**
* Return the kth smallest key in the symbol tables.
*
* @param k the order statistic
* @return the kth smallest key in the symbol tables
* @throws IllegalArgumentException unless <tt>k</tt> is between 0 and
* <em>N</em> − 1
*/
public Key select(int k) {
if (k < 0 || k >= size()) {
throw new IllegalArgumentException();
}
Node x = select(root, k);
return x.key;
}
// Return key of rank k.
private Node select(Node x, int k) {
if (x == null) {
return null;
}
int t = size(x.left);
if (t > k) {
return select(x.left, k);
} else if (t < k) {
return select(x.right, k - t - 1);
} else {
return x;
}
}
/**
* Return the number of keys in the symbol tables strictly less than
* <tt>key</tt>.
*
* @param key the key
* @return the number of keys in the symbol tables strictly less than
* <tt>key</tt>
* @throws NullPointerException if <tt>key</tt> is <tt>null</tt>
*/
public int rank(Key key) {
if (key == null) {
throw new NullPointerException("argument to rank() is null");
}
return rank(key, root);
}
// Number of keys in the subtree less than key.
private int rank(Key key, Node x) {
if (x == null) {
return 0;
}
int cmp = key.compareTo(x.key);
if (cmp < 0) {
return rank(key, x.left);
} else if (cmp > 0) {
return 1 + size(x.left) + rank(key, x.right);
} else {
return size(x.left);
}
}
/**
* Returns all keys in the symbol tables as an <tt>Iterable</tt>. To iterate
* over all of the keys in the symbol tables named <tt>st</tt>, use the
* foreach notation: <tt>for (Key key : st.keys())</tt>.
*
* @return all keys in the symbol tables
*/
public Iterable<Key> keys() {
return keys(min(), max());
}
/**
* Returns all keys in the symbol tables in the given range, as an
* <tt>Iterable</tt>.
*
* @return all keys in the sybol tables between <tt>lo</tt>
* (inclusive) and <tt>hi</tt> (exclusive)
* @throws NullPointerException if either <tt>lo</tt> or <tt>hi</tt>
* is <tt>null</tt>
*/
public Iterable<Key> keys(Key lo, Key hi) {
if (lo == null) {
throw new NullPointerException("first argument to keys() is null");
}
if (hi == null) {
throw new NullPointerException("second argument to keys() is null");
}
Queue<Key> queue = new Queue<Key>();
keys(root, queue, lo, hi);
return queue;
}
private void keys(Node x, Queue<Key> queue, Key lo, Key hi) {
if (x == null) {
return;
}
int cmplo = lo.compareTo(x.key);
int cmphi = hi.compareTo(x.key);
if (cmplo < 0) {
keys(x.left, queue, lo, hi);
}
if (cmplo <= 0 && cmphi >= 0) {
queue.enqueue(x.key);
}
if (cmphi > 0) {
keys(x.right, queue, lo, hi);
}
}
/**
* Returns the number of keys in the symbol tables in the given range.
*
* @return the number of keys in the sybol tables between <tt>lo</tt>
* (inclusive) and <tt>hi</tt> (exclusive)
* @throws NullPointerException if either <tt>lo</tt> or <tt>hi</tt>
* is <tt>null</tt>
*/
public int size(Key lo, Key hi) {
if (lo == null) {
throw new NullPointerException("first argument to size() is null");
}
if (hi == null) {
throw new NullPointerException("second argument to size() is null");
}
if (lo.compareTo(hi) > 0) {
return 0;
}
if (contains(hi)) {
return rank(hi) - rank(lo) + 1;
} else {
return rank(hi) - rank(lo);
}
}
/**
* Returns the height of the BST (for debugging).
*
* @return the height of the BST (a 1-node tree has height 0)
*/
public int height() {
return height(root);
}
private int height(Node x) {
if (x == null) {
return -1;
}
return 1 + Math.max(height(x.left), height(x.right));
}
/**
* Returns the keys in the BST in level orders (for debugging).
*
* @return the keys in the BST in level orders traversal
*/
public Iterable<Key> levelOrder() {
Queue<Key> keys = new Queue<Key>();
Queue<Node> queue = new Queue<Node>();
queue.enqueue(root);
while (!queue.isEmpty()) {
Node x = queue.dequeue();
if (x == null) {
continue;
}
keys.enqueue(x.key);
queue.enqueue(x.left);
queue.enqueue(x.right);
}
return keys;
}
/**
* ***********************
* Check integrity of BST data structures.
************************
*/
private boolean check() {
if (!isBST()) {
StdOut.println("Not in symmetric order");
}
if (!isSizeConsistent()) {
StdOut.println("Subtree counts not consistent");
}
if (!isRankConsistent()) {
StdOut.println("Ranks not consistent");
}
return isBST() && isSizeConsistent() && isRankConsistent();
}
// does this binary tree satisfy symmetric order?
// Note: this test also ensures that data structure is a binary tree since order is strict
private boolean isBST() {
return isBST(root, null, null);
}
// is the trees rooted at x a BST with all keys strictly between min and max
// (if min or max is null, treat as empty constraint)
// Credit: Bob Dondero's elegant solution
private boolean isBST(Node x, Key min, Key max) {
if (x == null) {
return true;
}
if (min != null && x.key.compareTo(min) <= 0) {
return false;
}
if (max != null && x.key.compareTo(max) >= 0) {
return false;
}
return isBST(x.left, min, x.key) && isBST(x.right, x.key, max);
}
// are the size fields correct?
private boolean isSizeConsistent() {
return isSizeConsistent(root);
}
private boolean isSizeConsistent(Node x) {
if (x == null) {
return true;
}
if (x.N != size(x.left) + size(x.right) + 1) {
return false;
}
return isSizeConsistent(x.left) && isSizeConsistent(x.right);
}
// check that ranks are consistent
private boolean isRankConsistent() {
for (int i = 0; i < size(); i++) {
if (i != rank(select(i))) {
return false;
}
}
for (Key key : keys()) {
if (key.compareTo(select(rank(key))) != 0) {
return false;
}
}
return true;
}
public int heightOfBinaryTree(Node node) {
if (node == null) {
return 0;
} else {
return 1
+ Math.max(heightOfBinaryTree(node.left),
heightOfBinaryTree(node.right));
}
}
/**
* Unit tests the <tt>BST</tt> data type.
*/
public static void main(String[] args) throws FileNotFoundException, IOException {
long startTime = System.currentTimeMillis();
//heightOfBinaryTree hbt = new heightOfBinaryTree();
Binaireboom<String, Integer> st = new Binaireboom<String, Integer>();
BufferedReader file = null;
int i = 0;
file = new BufferedReader(new FileReader(new File("")));
String TemporaryVar;
while ((TemporaryVar = file.readLine()) != null) {
TemporaryVar = TemporaryVar.replaceAll("[`~!@#$%^&*()_|+\\-=?;:'\",.<>\\{\\}\\[\\]\\\\\\/]", "");
String[] words = TemporaryVar.split(" ");
for (String word : words) {
if (word == null) {
continue;
}
st.put(word, 1);
i++;
}
}
StdOut.println();
for (String s : st.keys()) {
StdOut.println(s + " " + st.getAantal(s));
}
System.out.println(i);
System.out.println();
System.out.println("elapsed: " + (System.currentTimeMillis() - startTime));
System.out.println(Math.max(heightOfBinaryTree(node.left)));
}
}
答案 0 :(得分：0)
没有在main方法中为节点声明值...
您需要声明
Node node = new Node(args....)
或
Node node = someobject.getNode(arg..);
对我来说，如何从这个类中构建一个Node是不可能的。
即那将来自......