In Java I'm trying to make a Red Black Tree through inheritance with the Binary Tree I created (as provided along with the Binary Node) yet I'm having a lot of difficulty knowing where and how to start as well as how to override and even create the Insert and Remove functions for the Red Black Tree. Code and assistance in this topic will be greatly appreciated... here is the code I'm utilizing for this project. Binary Node I created: public class BinNode { private String data; private BinNode left; private BinNode right; private int height; //height field public BinNode(){ data = ""; left = null; right = null; } public int getHeight() { return height; } public void setHeight(int height) { this.height = height; } public BinNode(String d){ data = d; left = null; right = null; } public void setData(String d){ this.data = d; } public String getData(){ return this.data; } public void setLeft(BinNode l){ this.left = l; } public BinNode getLeft(){ return this.left; } public void setRight(BinNode r){ this.right = r; } public BinNode getRight(){ return this.right; } } Binary Tree I created: public class BinaryTree { private BinNode root; private BinNode curr; /* Function to traverse right */ public void goRight() { this.curr = this.curr.getRight(); } public BinaryTree() { root = new BinNode(); curr = new BinNode(); } public BinNode getRoot(){ return this.root; } /* Function to check if tree is empty */ public boolean isEmpty() { return this.root == null; } /* Functions to insert data */ public void insert(String data) { this.root = insert(this.root, data); } //done /* Function to insert data recursively */ private BinNode insert(BinNode node, String data) { if (node == null) node = new BinNode(data); else { int i = node.getData().compareTo(data); if (i < 0) { // Go right node.setRight(insert(node.getRight(), data)); } else if (i >= 0) { // Go left node.setLeft(insert(node.getLeft(), data)); } // write this! } return node; } /* Function to count number of nodes */ public int countNodes() { return countNodes(this.root); } /* Function to count number of nodes recursively */ private int countNodes(BinNode r) { if (r == null) { return 0; // If the current node is null, there are no nodes to count. } int leftCount = countNodes(r.getLeft()); // Count nodes in the left subtree int rightCount = countNodes(r.getRight()); // Count nodes in the right subtree // Add 1 to count the current node itself return 1 + leftCount + rightCount; } /* Function to search for an element */ public BinNode search(String val) { return search(this.root, val); } /* Function to search for an element recursively */ private BinNode search(BinNode r, String val) { // Base case: If the current node is null, the value is not found. if (r == null) { return null; } int comparison = val.compareTo(r.getData()); if (comparison < 0) { // Value is smaller, so search in the left subtree. return search(r.getLeft(), val); } else if (comparison > 0) { // Value is larger, so search in the right subtree. return search(r.getRight(), val); } else { // Value is equal to the current node's data, so it's found. //this.curr = r; return r; } } /* Function for inorder traversal */ public void inorder() { inorder(this.root); } private void inorder(BinNode r) { if (r != null) { inorder(r.getLeft()); System.out.print(r.getData() +" "); inorder(r.getRight()); } } /* Function for preorder traversal */ public void preorder() { preorder(root); } private void preorder(BinNode r) { if (r != null) { System.out.print(r.getData() +" "); preorder(r.getLeft()); preorder(r.getRight()); } } /* Function for postorder traversal */ public void postorder() { postorder(root); } private void postorder(BinNode r) { if (r != null) { postorder(r.getLeft()); postorder(r.getRight()); System.out.print(r.getData() +" "); } } // find the in-order successor of a given node public BinNode findInorderSuccessor(BinNode node) { BinNode current = node.getRight(); while (current.getLeft() != null) { current = current.getLeft(); } return current; } //Remove function public void remove(String key) { // Find the node to be removed and its parent BinNode parent = null; BinNode n = this.root; while (n != null && !n.getData().equals(key)) { parent = n; if (key.compareTo(n.getData()) < 0) { n = n.getLeft(); } else { n = n.getRight(); } } if (n == null) { // Key not found, nothing to remove return; } // Case 1: Node with no children if (n.getLeft() == null && n.getRight() == null) { if (parent == null) { // Removing the root node this.root = null; } else if (parent.getLeft() == n) { parent.setLeft(null); } else { parent.setRight(null); } } // Case 2: Node with one child else if (n.getLeft() == null || n.getRight() == null) { BinNode child = (n.getLeft() != null) ? n.getLeft() : n.getRight(); if (n == this.root) { this.root = child; } else if (parent.getLeft() == n) { parent.setLeft(child); } else { parent.setRight(child); } } // Case 3: Node with two children else { BinNode successor = findInorderSuccessor(n); n.setData(successor.getData()); remove(successor.getData()); // Recursively remove the successor } } }
In Java I'm trying to make a Red Black Tree through inheritance with the Binary Tree I created (as provided along with the Binary Node) yet I'm having a lot of difficulty knowing where and how to start as well as how to override and even create the Insert and Remove functions for the Red Black Tree. Code and assistance in this topic will be greatly appreciated... here is the code I'm utilizing for this project.
Binary Node I created:
public class BinNode
{
private String data;
private BinNode left;
private BinNode right;
private int height; //height field
public BinNode(){
data = "";
left = null;
right = null;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public BinNode(String d){
data = d;
left = null;
right = null;
}
public void setData(String d){
this.data = d;
}
public String getData(){
return this.data;
}
public void setLeft(BinNode l){
this.left = l;
}
public BinNode getLeft(){
return this.left;
}
public void setRight(BinNode r){
this.right = r;
}
public BinNode getRight(){
return this.right;
}
}
Binary Tree I created:
public class BinaryTree
{
private BinNode root;
private BinNode curr;
/* Function to traverse right */
public void goRight() {
this.curr = this.curr.getRight();
}
public BinaryTree()
{
root = new BinNode();
curr = new BinNode();
}
public BinNode getRoot(){
return this.root;
}
/* Function to check if tree is empty */
public boolean isEmpty()
{
return this.root == null;
}
/* Functions to insert data */
public void insert(String data)
{
this.root = insert(this.root, data);
} //done
/* Function to insert data recursively */
private BinNode insert(BinNode node, String data)
{
if (node == null)
node = new BinNode(data);
else
{
int i = node.getData().compareTo(data);
if (i < 0) {
// Go right
node.setRight(insert(node.getRight(), data));
} else if (i >= 0) {
// Go left
node.setLeft(insert(node.getLeft(), data));
}
// write this!
}
return node;
}
/* Function to count number of nodes */
public int countNodes()
{
return countNodes(this.root);
}
/* Function to count number of nodes recursively */
private int countNodes(BinNode r)
{
if (r == null) {
return 0; // If the current node is null, there are no nodes to count.
}
int leftCount = countNodes(r.getLeft()); // Count nodes in the left subtree
int rightCount = countNodes(r.getRight()); // Count nodes in the right subtree
// Add 1 to count the current node itself
return 1 + leftCount + rightCount;
}
/* Function to search for an element */
public BinNode search(String val)
{
return search(this.root, val);
}
/* Function to search for an element recursively */
private BinNode search(BinNode r, String val)
{
// Base case: If the current node is null, the value is not found.
if (r == null) {
return null;
}
int comparison = val.compareTo(r.getData());
if (comparison < 0) {
// Value is smaller, so search in the left subtree.
return search(r.getLeft(), val);
} else if (comparison > 0) {
// Value is larger, so search in the right subtree.
return search(r.getRight(), val);
} else {
// Value is equal to the current node's data, so it's found.
//this.curr = r;
return r;
}
}
/* Function for inorder traversal */
public void inorder()
{
inorder(this.root);
}
private void inorder(BinNode r)
{
if (r != null)
{
inorder(r.getLeft());
System.out.print(r.getData() +" ");
inorder(r.getRight());
}
}
/* Function for preorder traversal */
public void preorder()
{
preorder(root);
}
private void preorder(BinNode r)
{
if (r != null)
{
System.out.print(r.getData() +" ");
preorder(r.getLeft());
preorder(r.getRight());
}
}
/* Function for postorder traversal */
public void postorder()
{
postorder(root);
}
private void postorder(BinNode r)
{
if (r != null)
{
postorder(r.getLeft());
postorder(r.getRight());
System.out.print(r.getData() +" ");
}
}
// find the in-order successor of a given node
public BinNode findInorderSuccessor(BinNode node) {
BinNode current = node.getRight();
while (current.getLeft() != null) {
current = current.getLeft();
}
return current;
}
//Remove function
public void remove(String key) {
// Find the node to be removed and its parent
BinNode parent = null;
BinNode n = this.root;
while (n != null && !n.getData().equals(key)) {
parent = n;
if (key.compareTo(n.getData()) < 0) {
n = n.getLeft();
} else {
n = n.getRight();
}
}
if (n == null) {
// Key not found, nothing to remove
return;
}
// Case 1: Node with no children
if (n.getLeft() == null && n.getRight() == null) {
if (parent == null) {
// Removing the root node
this.root = null;
} else if (parent.getLeft() == n) {
parent.setLeft(null);
} else {
parent.setRight(null);
}
}
// Case 2: Node with one child
else if (n.getLeft() == null || n.getRight() == null) {
BinNode child = (n.getLeft() != null) ? n.getLeft() : n.getRight();
if (n == this.root) {
this.root = child;
} else if (parent.getLeft() == n) {
parent.setLeft(child);
} else {
parent.setRight(child);
}
}
// Case 3: Node with two children
else {
BinNode successor = findInorderSuccessor(n);
n.setData(successor.getData());
remove(successor.getData()); // Recursively remove the successor
}
}
}
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