Why Reference Node Doesn't Change It Value In Binary Search Tree

Feb 10, 2015

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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Unable To Remove Node From Binary Search Tree?

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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Linked Binary Search Tree - Creating Node Object

Apr 5, 2015

I'm trying to use LinkedBinarySearchTree but a lot of the variables are protected in BinaryTreeNode. I am creating a BinaryTreeNode object but it still isn't allowing me to use them. The variables I am trying to use are element, left, and right.

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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Ability To Search A Binary Search Tree And Return The Number Of Probes

Sep 1, 2014

I'm trying to build a method that can search a binary search tree for a specific target and then return the number of probes it took to get there. It seems to me that the best way to do this would be a recursive search method and a counter that tracks the number of calls. But I'm struggling with how to implement this. Here's the code I have so far. what works/doesn't work with the method.

// Method to search the tree for a specific name and
// return the number of probes
public T search(BTNode<T> btNode) {

[Code]....

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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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Creating Search Method For Binary Search Tree

Apr 22, 2014

I want to create a search method that returns the frequency of a word in the search method.

public class IndexTree {
private class TreeNode {
TreeNode left;
String word;
int frequency;
TreeNode right;

[Code] .....

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How To Implement Simple Binary Search Tree

May 17, 2015

I am trying to implement a simple binary search tree . How can I make a node in the tree which should store two pieces of information: a String variable called name, and a int variable called mark. ..

public class BinarySearchTree<E> implements Comparable<E> {
public BinaryTree<E> root;
int size;
int mark;
String name;
// Constructor
public BinarySearchTree()

[Code]...

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Not Getting Correct Results In Binary Search Tree

Aug 17, 2014

I don't see any nodes that I add. Not sure why getting this error.

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>

[Code] .....

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Finding Height Of Binary Search Tree?

Nov 13, 2014

So for an assignment I have to write a method that finds that height of this BST. I wrote this:

public int height(Node node)
{
if (node == null)
{
return 0;
}
else
{
return 1 +
Math.max(height(node.left),
height(node.right));
}
}

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");
tree.add("D", "4");
tree.add("E", "5");
tree.add("F", "6");
tree.add("G", "7");
tree.add("H", "8");
System.out.println(tree);
System.out.println(tree.height());

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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How To Compare String In Binary Search Tree

Aug 31, 2014

I'm trying to implement a Binary Search Tree that accepts strings. I cannot figure out how to compare the string value in my add method against the node object. While I could make the node class data be the string type I am trying to make the code be as reusable as possible. So my question is this, is there a simple way I can compare the two that I am missing?

public class BTNode<E> {
private E data;
private BTNode<E> left, right;
//constructor
public BTNode(E initialData, BTNode<E> initialLeft, BTNode<E> initialRight) {
data = initialData;
left = initialLeft;
right = initialRight;

[Code] ....

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Insert Numbers In Binary Search Tree

Oct 13, 2011

I am trying to make binary search tree...I am trying to construct the left part of binary search tree with root node set as 70...It is not working ...My code is

public class Node {
/**
* @param args
*/

int root;
Node left;
Node right;
public void insertNode(Node node, int num) {
//Node nodeRoot = this;
//root of tree we have set to 70...constructing only left of tree with root=70

[Code] .....

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Binary Search Tree To Graphic Text File

Nov 24, 2014

I am trying to draw a binary node tree to a text file.

public class BinaryTreeExample {
public static void main(String[] args) {
new BinaryTreeExample().run();
} static class Node {
Node left;
Node right;
int value;
public Node(int value) {

[Code] .....

This will output:

Building tree with rootvalue25
=================================
Inserted 11 to left of node 25
Inserted 15to right of node 11
Inserted 16to right of node 15
Inserted 23to right of node 16
Inserted 79to right of node 25
Traversing tree in order
=================================
Traversed 11
Traversed 15
Traversed 16
Traversed 23
Traversed 25
Traversed 79

I need to print this information in the form of a graphic to a text file. so for example:

OUTPUT IN TEXT FILE
25
/
11 79
etc...

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Searching Binary Search Tree For Movie By Rating

May 8, 2015

The purpose of this function is to use a Movie object and a binary search tree to find all movies that have been read in through a file that have a certain rating (G,PG,PG-13,R). The error I am getting is that it seems I am not traversing fully through the tree and therefore only some movies with the rating I search for are output, not all of them with that rating. I have tried figuring out why this is happening and at first I thought my tree was unbalanced, but I am sure it is simply because I am not traversing the tree correctly. I think my implementation in the main is close to what I need but it needs some tweaking. This is my BST class which I created and required to use for this purpose.

public class BinarySearchTree {
/**
* The head of the tree.
*/
private Node root;
/**
* Constructor that declares the head of tree to null.
*/
public BinarySearchTree() {
root = null;
}
/**
* Returns null if head of tree is empty.
* @return null if head of tree is empty.
*/
public boolean isEmpty(){

[Code]...

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Constructing Expression Trees In Java By Using Binary Search Tree

May 6, 2014

I Write a Java program to parse a syntactically correct arithmetical expression and produce an equivalent Expression TREE. Remember, in an expression tree the terminal nodes are variables and constants, and the interior nodes are operators (such as +,-,*,/).

For instance the expression: (1 + 2) * 3 can be represented by the following tree:

INPUT Expression
(1 +2)*3
POSTORDER Expression
1 2 + 3 *
TREE [root=asd.reg.Node@56ddc58]

But when i Execute the program it Shows only Prefix and postfix .But the requered output is in inorder preorder and postorder so how to solve these error

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.tree.TreeNode;
public class InToPost {
private static String str;

[Code] .....

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Importing Values From Text File Into Binary Search Tree

Nov 25, 2014

importing values from a text file into a Binary Search Tree. Currently my tree is hard coded w/ values in the BTreePrinterTest Class.

BTreePrinter Class:
Java Code:
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

[code]...

My input text file will be in the following format, each row is 1 tree, each empty line between the rows means a new tree.Java Code:

80 45 14 1 2 3 4 51

2 4 7 8 9 6 3 4

1 2 3 4 5 6 7 9 mh_sh_highlight_all('java');

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Binary Search Tree Dictionary Returning All Words Misspelled

Feb 12, 2015

The assignment is to be able to read two files, a dictionary file, and a file you want to spell check. I've also attached the test files too.

When reading small files where there is only one word per line it works fine. But when I try to test a paragraph it returns all the words as misspelt.

Here are all of the classes that were given for this assignment. I've made some modifications to try to get them to work properly.

BinarySearchTree.java

// ADT binary search tree.
// Assumption: A tree contains at most one item with a given search key at any time.

public class BinarySearchTree extends BinaryTreeBasis {
// inherits isEmpty(), makeEmpty(), getRootItem(), and
// the use of the constructors from BinaryTreeBasis

[Code] .....

As you can see I read in the dictionary file and the spellcheck file, construct a new BST, and then insert each word from the dictionary into the tree.

Then I make an empty arraylist for the misspelt words. While searching through the spellcheck file, if it finds any incorrect words, it adds them to the list then returns the list after it's done reading through the file.

But for some reason it prints out every single word in the test file and I can't figure out why.

Attached File(s)

dictionary_large.txt (1.83MB)
dictionary_small.txt (225bytes)
test_large.txt (553bytes)
test_small.txt (52bytes)

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Binary Search Tree - Calling FindSmallest Method In Main Class

Nov 3, 2014

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

public class Tester {
public static void main(String[] args){
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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Java N-node Tree

Mar 30, 2015

I'm trying to write Java code for the following figure. Where, if node:4 will create following separate 4 trees. Number of node in

LEVEL1 (yellow) : n node.
LEVEL2 (green) : n-1 node.
LEVEL3 (blue) : n-2 node.

See image for node:4.
4node.jpg

The example out for node:4 :
012
013
021
023
031
032 and so on.

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Swing/AWT/SWT :: Sorting In File Tree Node

May 12, 2014

I have requirement of sorting the files in tree structure with name and timestamp of creation, i am new to swings...

Here we are using FileTreeModel.

Root Folder:
folder1;
file1
file2
.
.

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JavaFX 2.0 :: Mouse Event For Tree Node

Jun 10, 2014

I have a TreeView insight TabPane
 
treeView.setOnMouseClicked(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent mouseEvent) {
                if (mouseEvent.getClickCount() == 2 && mouseEvent.getButton() == MouseButton.PRIMARY) {
                    // Some action
                }
            }
        });

For some reason when I click on a tab body I can also perform the listener action. How I can add additional statement to perform the action only if I select node?

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Polymorphic Reference Doesn't Seem To Be Specific

May 18, 2015

Is there a short term that means: "using an object reference with the datatype of a supertype to refer to an object with the datatype of a subtype"?

Saying "polymorphic reference" doesn't seem to be specific enough because ALL references other than those with the Object datatype are polymorphic. I saw one post that referred to these reference variables as a "supertype reference." In the absence of any other (more official) term, I may just use that term because calling a reference a "supertype reference" implies that there is a subtype. It sure beats what I was thinking about using: "sub-as-super." Which, when the inevitable mispronunciations occur, would lead to all kinds of off-color jokes.

Is there an "official" term that all of the dozens of Java books I have read seem to have missed? Or does everyone stumble along, spelling things out with a nearly sentence-long phrase.

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JSF :: Tomahawk Tree - Find Node ID In Bean Side?

Jan 6, 2015

I used tomahawk t:tree for showing my data in tree structure and displayed that very fine. But my problem is how can we find the node id in bean side when we select one node .Because i want to show some data based on that node.

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JavaFX 2.0 :: Select Tree Node On Button Click

Jun 20, 2014

I want to develop simple example in which I can select TreeView Nodes with Buttons(in some cases clicking on image and etc). I created this simple sample:
 
<pre style="" _modifiedtitle="true" jivemacrouid="_14032555963537721" ___default_attr="java" jivemacro="code" class="jive_text_macro jive_macro_code jivemacrouid_14032555963537721">
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.geometry.Insets;

[Code] .... 
 
The question is how I can select tree Node when I click on a button. For example when I click on a button Item A1 I want to select tree idem Item A1.

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Search Form Doesn't Work

Feb 18, 2014

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class frmSearch extends JDialog
{
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
JPanel jpnlMain = new JPanel();

[Code] ....

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Looping Doesn't Change Value

Apr 28, 2014

Write a program that asks the user for the low and high integer in a range of integers. The program then asks the user for integers to be added up. The program computes two sums:

The sum of integers that are in the range (inclusive), and the sum of integers that are outside of the range. The user signals the end of input with a 0.

Your output should look like this:

Sample input/output

In-range Adder Low end of range: 20
High end of range: 50
Enter data: 21
Enter data: 60
Enter data: 49
Enter data: 30
Enter data: 91
Enter data: 0
Sum of in range values: 100
Sum of out of range values: 151

This is my assignment and below is my code.

import java.util.Scanner;
class InRangeAdder {
public static void main(String[] args) {
Scanner scan = new Scanner (System.in);
int low, high, data=1, rangesum=0, outrangesum=0;

[Code] ....

The problem is that the program simply gives an output of 0 for both "rangesum" and "outrangesum". I don't quite understand why that is. Also i have a quick question, the program needs me to end the program when the value of data is 0 but in order to initialize it I need to give it a value. Usually I would give it a value of 0 like I have for rangesum and outrangesum but if I do the program does not run till the loop as it considers the value of data to be 0 and ends the program right away. What would be a work around to this and when do I need to have a value to initialize an integer? for example, I do not need a value for low and high. Is this because the program recognizes that a value is going to be defined but cannot do that for the other integers as they are inside a loop?

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Binary Expression Tree

Apr 23, 2015

So everything in my program is working EXCEPT when it comes to calculating the result. I am supposed to evaluate the expression using postorder traversal to return the answer. I am honestly not sure how I would get the postorder traversal to return the answer to the expression since the only thing we really went over was how it re-ordered the expression so that it would end in the postorder/postfix order. Anyways, currently the way that I have the public int evaluate(Node node)method set up is giving me a result of 0, which obviously is not correct.

Here's the section that I'm having issues with:

public int evaluate(Node node){
if(node.isLeaf()){
return Integer.parseInt(node.value);
}
int result = 0;
int left = evaluate(node.left);
int right = evaluate(node.right);

[code]....

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