Skip to main content

Java Program To Implement Red Black Tree Operations.

import java.util.Scanner;
public class RedBlackTreeA {
public static void main(String[] args) {

Scanner scan = new Scanner(System.in);
RBTree rbt = new RBTree(Integer.MIN_VALUE);
char ch;

do {       // Deletion of Nodes is not implemented.
System.out.println("Red Black Tree Operations:");
System.out.println("1. Insert ");
System.out.println("2. Search");
System.out.println("3. Count Nodes");
System.out.println("4. Check Empty");
System.out.println("5. Clear Tree\n");
System.out.print("Enter Your Choice: ");

int choice = scan.nextInt();
switch (choice) {

case 1 :
System.out.print("Enter An Integer To Insert: ");
rbt.insert( scan.nextInt() );
break;

case 2 :
System.out.print("Enter An Integer To Search: ");
System.out.println("Search Result : "+ rbt.search( scan.nextInt() ));
break;

case 3 :
System.out.println("Nodes = "+ rbt.countNodes());
break;

case 4 :
System.out.println("Empty Status = "+ rbt.isEmpty());
break;

case 5 :
System.out.println("Tree Cleared");
rbt.makeEmpty();
break;

default :
System.out.print("Wrong Entry \n ");
break;
}

System.out.print("\nPost Order : ");
rbt.postorder();
System.out.print("\nPre Order : ");
rbt.preorder();
System.out.print("\nIn Order : ");
rbt.inorder();

System.out.println("\n\nDo You Want To Continue (Type Y OR N): ");
ch = scan.next().charAt(0);
} while (ch == 'Y'|| ch == 'y');

scan.close();
}}

RedBlackNode.java:
class RedBlackNode {
RedBlackNode left, right;
int element;
int color;

public RedBlackNode(int theElement){
this( theElement, null, null );
}

public RedBlackNode(int theElement, RedBlackNode lt, RedBlackNode rt){
left = lt;
right = rt;
element = theElement;
color = 1;
}}

class RBTree {
private RedBlackNode current;
private RedBlackNode parent;
private RedBlackNode grand;
private RedBlackNode great;
private RedBlackNode header;
private static RedBlackNode nullNode;

static {
nullNode = new RedBlackNode(0);
nullNode.left = nullNode;
nullNode.right = nullNode;
}

static final int BLACK = 1;
static final int RED   = 0;

public RBTree(int negInf) {
header = new RedBlackNode(negInf);
header.left = nullNode;
header.right = nullNode;
}

public boolean isEmpty() {
return header.right == nullNode;
}

public void makeEmpty() {
header.right = nullNode;
}

public void insert(int item ) {
current = parent = grand = header;
nullNode.element = item;

while (current.element != item) {
great = grand;
grand = parent;
parent = current;

current = item < current.element ? current.left : current.right;
if (current.left.color == RED && current.right.color == RED)
handleReorient( item );
}

if (current != nullNode)
return;
current = new RedBlackNode(item, nullNode, nullNode);

if (item < parent.element)
parent.left = current;

else
parent.right = current;
handleReorient( item );
}

private void handleReorient(int item) {
current.color = RED;
current.left.color = BLACK;
current.right.color = BLACK;

if (parent.color == RED) {
grand.color = RED;

if (item < grand.element != item < parent.element)
parent = rotate( item, grand );  // Start dbl rotate
current = rotate(item, great );
current.color = BLACK;
}

header.right.color = BLACK;
}

private RedBlackNode rotate(int item, RedBlackNode parent){

if(item < parent.element)
return parent.left = item < parent.left.element ? rotateWithLeftChild(parent.left) : rotateWithRightChild(parent.left) ; 

else
return parent.right = item < parent.right.element ? rotateWithLeftChild(parent.right) : rotateWithRightChild(parent.right); 
}

private RedBlackNode rotateWithLeftChild(RedBlackNode k2){
RedBlackNode k1 = k2.left;
k2.left = k1.right;
k1.right = k2;
return k1;
}

private RedBlackNode rotateWithRightChild(RedBlackNode k1){
RedBlackNode k2 = k1.right;
k1.right = k2.left;
k2.left = k1;
return k2;
}

public int countNodes() {
return countNodes(header.right);
}

private int countNodes(RedBlackNode r) {
if (r == nullNode)
return 0;

else {
int l = 1;
l += countNodes(r.left);
l += countNodes(r.right);
return l;
}}

public boolean search(int val) {
return search(header.right, val);
}

private boolean search(RedBlackNode r, int val) {
boolean found = false;

while ((r != nullNode) && !found) {
int rval = r.element;

if (val < rval)
r = r.left;

else if (val > rval)
r = r.right;

else {
found = true;
break;
}

found = search(r, val);
}
return found;
}

public void inorder() {
inorder(header.right);
}

private void inorder(RedBlackNode r) {

if (r != nullNode) {
inorder(r.left);
char c = 'B';

if (r.color == 0)
c = 'R';

System.out.print(r.element +""+c+" ");
inorder(r.right);
}}

public void preorder() {
preorder(header.right);
}

private void preorder(RedBlackNode r) {
if (r != nullNode) {
char c = 'B';

if (r.color == 0)
c = 'R';

System.out.print(r.element +""+c+" ");
preorder(r.left);
preorder(r.right);
}}

public void postorder(){
postorder(header.right);
}

private void postorder(RedBlackNode r) {

if (r != nullNode) {
postorder(r.left);
postorder(r.right);
char c = 'B';

if (r.color == 0)
c = 'R';

System.out.print(r.element +""+c+" ");
}}}
Labels:

Popular posts from this blog

Screenshots from Windows 1.01

Windows 1.0 is a graphical personal computer operating environment developed by Microsoft, released on November 20, 1985, as the first version of the Microsoft Windows line. Version 1.01 , also released in 1985, was the first point-release after Windows 1.00.   Screenshots from Windows 1.01: ⇰ Desktop  First Run Empty Desktop Desktop With Applications ⇰  Office Applications Notepad Text Editor Calculator Calendar Clock Address Book ⇰  Multimedia Applications Media player, CD player, Volume level, and Sound: This GUI doesn’t have these features. ⇰  Networking Applications Terminal Phone Dialer: This GUI doesn’t have this feature. ⇰  Internet Applications Browser, and Mail: This GUI doesn’t have these features. ⇰  Accessibility Applications Keyboard Map:  This GUI doesn’t have this feature. ⇰  Settings Desktop themes,  Display,  S...
Read more

The C Programming Language, 2nd Edition*

This book is meant to help the reader learn how to program in C. It is the definitive reference guide, now in a second edition. Although the first edition was written in 1978, it continues to be a worldwide best-seller. This second edition brings the classic original up to date to include the ANSI standard. For evolution of the planet earth and our modern understanding of biology, there was Darwin's Origin of the Species. For mathematics, there was Newton's Philosophiæ Naturalis Principia Mathematica. Well, for the internet, for Facebook, for LinkedIn, Twitter, Instgram, Snapchat, WhatsApp, Pornhub and even the odious website for Justin Bieber would never have existed without Kernigan and Ritchie (more affectionately known as K&R)'s classic, The C Programming Language. What language was TCP/IP written in? C. What language inspired both C++ and Java (and the abominable C#)? C. What language are most libraries on most operating systems written in if not assembler? C. ...
Read more

C++ Program To Implement Casino Number Guessing Game.

#include <iostream> #include <string> #include <cstdlib> #include <ctime> using namespace std; void drawLine(int n, char symbol); void rules(); int main() { string playerName; int amount; int bettingAmount; int guess; int dice; char choice; srand(time(0)); drawLine(70,'_'); cout << "\n\n\n\t\tCASINO GAME\n\n\n\n"; drawLine(70,'_'); cout << "\n\nEnter Your Name : "; getline(cin, playerName); cout << "\n\nEnter Deposit Amount To Play Game : $"; cin >> amount;
Read more

Java: The Complete Reference, 9th Edition

This is Herb's most popular book on Java, fully updated and expanded to cover Java SE 8 (JDK 8).    Whether you're an experienced pro or just starting out, this one-stop guide will help you master this important language.  Inside you'll find comprehensive coverage of the Java language, its keywords, syntax, and fundamental programming principles.  Of course, descriptions of Java's newest features, such as lambda expressions, default interface methods, and the stream API are included. This lasting resource also describes key elements of the Java API library, such as the Collections Framework, concurrency, applets, servlets, Beans, event handling,  AWT,  Swing, and more. Coverage of JavaFX, Java's newest GUI framework, is also included. *** TO REVIEW BOOK ***  (click below) *** TO REVIEW SOURCE CODE PROBLEM  SOLUTIONS, VISIT   THIS   LINK ***
Read more

Java: A Beginner's Guide, 6th Edition

This is Herb's step-by-step introduction to Java, updated for Java SE 8 (JDK 8). If you are just learning Java, then this is the book for you.  It starts at the beginning, explaining the history of Java, why it's important to the Web, and how it relates to the world of programming at large.  You then learn how to obtain the Java Development Kit (JDK) and write your first Java program. Next, it's on to the Java fundamentals, including data types, operators, control statements, classes, objects, and methods.  You'll then progress to more advanced topics, such as inheritance, exception handling, the I/O system, multithreading,  applets, and lambda expressions. Also included is coverage of some of Java's most powerful features, such as generics, autoboxing, enumerations, and static import.  An introduction to JavaFX, Java's newest GUI framework, is also included. *** TO REVIEW BOOK *** (click below) *** TO REVIEW SOURCE CODE PROBLEM  SO...
Read more