The idea of generating the graphical interface will be through a python file so I have to generate a text file in the following format:
4 [2] [6]
2 [1] [3]
6 [5] [8]
1 [] []
3 [] []
5 [] []
8 [7] [9]
7 [] []
9 [] []
Well, with this we have to do the savetofile function. It is giving the following errors:
AvlTree.java:188: error: cannot find symbol
if (ptraiz==0) return;
^
symbol: variable ptraiz
location: class AvlTree
AvlTree.java:190: error: cannot find symbol
LinkedList<nd> list = new LinkedList<nd>();
^
symbol: class nd
location: class AvlTree
AvlTree.java:190: error: cannot find symbol
LinkedList<nd> list = new LinkedList<nd>();
^
symbol: class nd
location: class AvlTree
AvlTree.java:192: error: cannot find symbol
fila.push(ptraiz);
^
symbol: variable ptraiz
location: class AvlTree
AvlTree.java:192: error: cannot find symbol
fila.push(ptraiz);
^
symbol: variable fila
location: class AvlTree
AvlTree.java:197: error: cannot find symbol
while (!fila.empty()) {
^
symbol: variable fila
location: class AvlTree
AvlTree.java:198: error: cannot find symbol
nd q = fila.front();
^
symbol: class nd
location: class AvlTree
AvlTree.java:198: error: cannot find symbol
nd q = fila.front();
^
symbol: variable fila
location: class AvlTree
AvlTree.java:201: error: cannot find symbol
fila.push(q.esq);
^
symbol: variable fila
location: class AvlTree
AvlTree.java:206: error: cannot find symbol
fila.push(q.dir);
^
symbol: variable fila
location: class AvlTree
AvlTree.java:211: error: cannot find symbol
fila.pop();
^
symbol: variable fila
location: class AvlTree
11 errors
Can anyone help?
import java.io.*;
import java.util.*;
public class AvlTree {
private AvlNode root = null;
public AvlTree( ) {
root = null;
}
public void clear() {
root = null;
}
public boolean isEmpty() {
return root == null;
}
public AvlNode getRootNode (){
return root;
}
/** Retorna a altura da árvore */
private static int height( AvlNode t ) {
return t == null ? -1 : t.height;
}
/**
* Retorna o maior valor ente lhs e rhs.
*/
private static int max( int lhs, int rhs ) {
return lhs > rhs ? lhs : rhs;
}
/** Retorna o fator de balanceamento da árvore com raiz t */
private int getFactor (AvlNode t) {
return height( t.left ) - height( t.right );
}
public boolean insert (int x) {
root = insert (x, root);
return true;
}
private AvlNode insert (int x, AvlNode t) {
if( t == null )
t = new AvlNode( x, null, null );
else if( x<t.key ) t.left = insert( x, t.left );
else if( x>t.key) t.right = insert( x, t.right );
t = balance (t);
return t;
}
public AvlNode balance (AvlNode t) {
if ( getFactor(t) == 2 ) {
if (getFactor (t.left)>0) t = doRightRotation( t );
else t = doDoubleRightRotation( t );
}
else if ( getFactor(t) == -2 ) {
if ( getFactor(t.right)<0 ) t = doLeftRotation( t );
else t = doDoubleLeftRotation( t );
}
t.height = max( height( t.left ), height( t.right ) ) + 1;
return t;
}
/** Faz Rotação simples a direita */
private static AvlNode doRightRotation( AvlNode k2 ) {
AvlNode k1 = k2.left;
k2.left = k1.right;
k1.right = k2;
k2.height = max( height( k2.left ), height( k2.right ) ) + 1;
k1.height = max( height( k1.left ), k2.height ) + 1;
return k1;
}
/** Rotação simples à esquerda */
private static AvlNode doLeftRotation( AvlNode k1 ) {
AvlNode k2 = k1.right;
k1.right = k2.left;
k2.left = k1;
k1.height = max( height( k1.left ), height( k1.right ) ) + 1;
k2.height = max( height( k2.right ), k1.height ) + 1;
return k2;
}
/** Rotação dupla à direita */
private static AvlNode doDoubleRightRotation( AvlNode k3 ) {
k3.left = doLeftRotation( k3.left );
return doRightRotation( k3 );
}
/** Rotação dupla à esquerda */
private static AvlNode doDoubleLeftRotation( AvlNode k1 ) {
k1.right = doRightRotation( k1.right );
return doLeftRotation( k1 );
}
public AvlNode search(int el) {
return search(root,el);
}
protected AvlNode search(AvlNode p, int el) {
while (p != null) {
/* se valor procuradp == chave do nó retorna referência ao nó */
if (el==p.key) return p;
/* se valor procurado < chave do nó, procurar na sub-árvore esquerda deste nó */
else if (el<p.key) p = p.left;
/* se valor procurado > chave do nó, procurar na sub-árvore direita deste nó */
else p = p.right;
}
// caso chave não foi achada, retorna null
return null;
}
public void inorder() {
inorder(root);
}
protected void inorder(AvlNode p) {
if (p != null) {
inorder(p.left);
System.out.print(p.key+" - ");
inorder(p.right);
}
}
public void preorder() {
preorder(root);
}
protected void preorder(AvlNode p) {
if (p != null) {
System.out.print(p.key + " ");
preorder(p.left);
preorder(p.right);
}
}
public void postorder() {
postorder(root);
}
protected void postorder(AvlNode p) {
if (p != null) {
postorder(p.left);
postorder(p.right);
System.out.print(p.key + " ");
}
}
protected AvlNode searchFather (int el) {
AvlNode p = root;
AvlNode prev = null;
while (p != null && !(p.key==el)) { // acha o nó p com a chave el
prev = p;
if (p.key<el)
p = p.right;
else p = p.left;
}
if (p!=null && p.key==el) return prev;
return null;
}
/* método de autoria de Leonardo Zandoná - 2006/2 */
public void displayTree() {
if (isEmpty()){
System.out.println("Árvore vazia!");
return;
}
String separator = String.valueOf(" |__");
System.out.println(this.root.key+"("+root.height+")");
displaySubTree(root.left, separator);
displaySubTree(root.right, separator);
}
private void displaySubTree(AvlNode node, String separator) {
if (node != null) {
AvlNode father = this.searchFather(node.key);
if (node.equals(father.left) == true) {
System.out.println(separator+node.key+"("+node.height+")"+" (ESQ)");
}else{
System.out.println(separator+node.key+"("+node.height+")"+" (DIR)");
}
displaySubTree(node.left, " "+separator);
displaySubTree(node.right, " "+separator);
}
}
public void savetofile(OutputStream fnome) {
if (ptraiz==0) return;
LinkedList<nd> list = new LinkedList<nd>();
fila.push(ptraiz);
// ofstream out(fnome);
// fnome= new FileOutputStream("saida.txt");
OutputStreamWriter osw = new OutputStreamWriter(fnome);
BufferedWriter bw = new BufferedWriter(osw);
while (!fila.empty()) {
nd q = fila.front();
bw.write(q.chave +" ");
if (q.esq != 0) {
fila.push(q.esq);
bw.write(" ["+q.esq.chave +"] ");
} else
bw.write(" [] ");
if (q.dir != 0) {
fila.push(q.dir);
bw.write(" ["+q.dir.chave+"] ");
} else
bw.write(" [] ");
bw.newLine();
fila.pop();
}
bw.close();