Find Node Method Within Binary Tree

Mar 29, 2015

I have some work where I have to create a binary tree. Anyway I am stuck on one of the classes which has several methods I must fill in! The code is below

The headers for each method are: public Node find (member p1)The method find(Member p1) is used to return the node which contains a particular member. It is a private method because the interface to CabinetTree should not provide direct access to the internal nodes. It makes use of the method Node findNode (Member p1, Node current)

and the next method is : Node findNode(Member p1, Node current) which searches the tree from current node to find a node whose value is equal to the Member p1, i.e. a node in the tree such that p1.equals(current.getMember()) is true. If there is no such node then the method should return null.

public class CabinetTree {
private Node head;
CabinetTree(Member p1) {
head = new Node(p1, null);

[Code] ....

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Apr 1, 2015

So in my binary search tree I'm trying to write a method that deletes the idem but for some reason it's not working. I have two things, I have the method and then another piece of code that tests the deletion method. Here's the actual method
 
public void delete(String word) {
root = deleteItem(root, word);
}
protected TreeNode deleteItem(TreeNode r, String word) {
if (r == null){
return r;
}
if(word.compareTo(r.item.getWord()) < 0){

[Code]...

Here's the test code

message = "Test: deleting 'word' -- ";
t = new BSTRefBased();
try {
t.delete("word");
result = t.getRootItem().getWord().equals(null);
} catch (Exception e) {
result = false;
}
System.out.println(message + (result ? "passed" : "FAILED"));

So for some reason it keeps saying that the test failed. Why does it keep saying that.

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the problem was :

i wrote it on paper with my examples.and just for laughts , i uploaded another picture that dont belong to my problem. its just my way to understand binary search tree implementation , so i wanted so share.just for laught : looks like the map of the universe.

now my problem : why after i changed Current to Current.left, Parent still has the value of root. i draw and wrote it on a paper. to be clear as possible - picture 2 :

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import ch11.exceptions.*;
import ch10.LinkedBinaryTree;
import ch10.BinaryTreeNode;
/**
* LinkedBinarySearchTree implements the BinarySearchTreeADT interface with links.

*/
public class LinkedBinarySearchTree<T> extends LinkedBinaryTree<T>
implements BinarySearchTreeADT<T>

[Code] ....

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import java.util.List;
import java.io.ObjectInputStream;
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[code]....

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package bp;
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public class BinaryTree implements IBinaryTree {
private Node root = null;
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[Code] ....

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Nov 3, 2014

How should I call my findSmallest method in the main class.. Here is the code:

public class Tester {
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try {
BinaryTree<Integer> myTree2 = new BinaryTree<Integer>();
 
myTree2.insert(5);
myTree2.insert(2);
myTree2.insert(7);

[Code] ....

So the question is what kind of parameter I should pass in myTree2.findSmallest()??? Here is my findSmallest method..

public E findSmallest(Node<E> parent){
if(parent.left.left == null){
E returnValue = parent.left.data;
parent.left = parent.left.right;
return returnValue;
} else {
return findSmallest(parent.left);
}
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I have this so far:

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Does this look somewhat correct?

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[Code] .....

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See image for node:4.
4node.jpg

The example out for node:4 :
012
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023
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<pre style="" _modifiedtitle="true" jivemacrouid="_14032555963537721" ___default_attr="java" jivemacro="code" class="jive_text_macro jive_macro_code jivemacrouid_14032555963537721">
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[Code] .... 
 
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Here's the section that I'm having issues with:

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[code]....

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Java Code:

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[code]....

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[code]....

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import java.io.BufferedReader;
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[code]....

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[code]....

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In java, it would

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Until the, everything works normally, but when I want to loop until there is no longer any issue by

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<c:set var="cursor" value="${nodes}" scope="session"></c:set>
<c:set var="i" value="0" scope="session"></c:set>
<form>
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<c:when test="${not empty cursor[i].getQuestion() }">
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[Code] ....

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package SystemandDesign.BinaryTree;
 import java.io.FileInputStream;
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import java.util.List;
import java.io.ObjectInputStream;
import java.util.Scanner;
 
[Code] ....

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int size;
int mark;
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// Constructor
public BinarySearchTree()

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Aug 17, 2014

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duplicate found
Exception in thread "main" java.lang.NullPointerException
at binarysearchtree.delete(binarysearchtree.java:111)
at binarysearchtree.main(binarysearchtree.java:196)
Java Result: 1
public class node<T>

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Apr 23, 2015

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package hw10;
public class Node {
String value;
Node left, right;
public Node(String value) {

[Code] .....

When i test my code, some trouble like this:

Enter a prefix expression: - + 10 * 2 8 3
prefix expression:
- + 10 * 2 8 3
postfix expression:
+ 10 * 2 8 3 -
infix expression:
( ( 10 + ( 2 * 8 ) ) - 3 )

[Code] .....

the error lines:

75: double left = evaluate(node.left);
107: evaluate(root);

In the Instruction, which said:

- int evaluate(Node node)

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And I found the postfix expression was wrong, it should be: 10 2 8 * + 3 -

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Nov 13, 2014

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public int height(Node node)
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return 0;
}
else
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return 1 +
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}
}

Which makes sense in my head. However, I added a couple of nodes in and realized I'm not sure how to call this method.

public static void main(String[] args) {
Tree<String, String> tree = new Tree<String, String>();
tree.add("A", "1");//some added stuff
tree.add("B", "2");
tree.add("C", "3");
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tree.add("E", "5");
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System.out.println(tree);
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What exactly do I put in the parenthesis after tree.height? If you need to see more of my code I can do that but it is quite lengthy.

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