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In: Computer Science

(Java) Implement a RightThreadTree class as an extension of a BinarySearchTree A right-threaded tree is a...

(Java) Implement a RightThreadTree class as an extension of a BinarySearchTree

A right-threaded tree is a binary search tree in which each right link that would normally be null is a "thread" that links that node to its inorder successor. The thread enables nonrecursive algorithms to be written for search and inorder traversals that are more efficient than recursive ones. Implement a RightThreadTree class as an extension of a BinarySearchTree. You will also need an RTNode that extends the Node class to include a flag that indicates whether a node's right link is a real link or a thread.

Solutions

Expert Solution

```
/**
```

 *    Java Program to Implement Threaded Binary Tree

```
 **/
```
```
 
```
```
import java.util.Scanner;
```
```
 
```
```
/** Class TBSTNode **/
```
```
class TBSTNode
```
```
{
```
```
    int ele;
```
```
    TBSTNode left, right;
```
```
    boolean leftThread, rightThread;
```
```
 
```
```
    /** Constructor **/
```
```
    public TBSTNode(int ele)
```
```
    {
```

        this(ele, null, null, true, true);

```
    }
```
```
 
```
```
    /** Constructor **/
```

    public TBSTNode(boolean leftThread, boolean rightThread)

```
    {
```
```
        this.ele = Integer.MAX_VALUE;
```
```
        this.left = this;
```
```
        this.right = this;
```
```
        this.leftThread = leftThread;
```
```
        this.rightThread = rightThread;
```
```
    }
```
```
 
```
```
    /** Constructor **/
```

    public TBSTNode(int ele, TBSTNode left, TBSTNode right, boolean leftThread, boolean rightThread)

```
    {
```
```
        this.ele = ele;
```
```
        this.left = left;
```
```
        this.right = right;
```
```
        this.leftThread = leftThread;
```
```
        this.rightThread = rightThread;
```
```
    }
```
```
}
```
```
 
```
```
/** Class ThreadedBinarySearchTree **/
```
```
class ThreadedBinarySearchTree
```
```
{
```
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    private TBSTNode root;
```
```
 
```
```
    /** Constructor **/
```
```
    public ThreadedBinarySearchTree () 
```
```
    {
```

        root = new TBSTNode(true, false);

```
    }
```
```
 
```
```
    /** Function to clear tree **/
```
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    public void clear()
```
```
    {
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        root = new TBSTNode(true, false);

```
    }
```
```
 
```

    /** Function to insert an element **/

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    public void insert(int ele) 
```
```
    {
```

        TBSTNode ptr = findNode(root, ele);

```
 
```
```
        /** element already present **/
```
```
        if (ptr == null)
```
```
            return;         
```
```
 
```
```
        if (ptr.ele < ele) 
```
```
        { 
```

            TBSTNode nptr = new TBSTNode(ele, ptr, ptr.right, true, true);

```
            ptr.right = nptr;
```
```
            ptr.rightThread = false;
```
```
        }
```
```
        else
```
```
        {
```

            TBSTNode nptr = new TBSTNode(ele, ptr.left, ptr, true, true);

```
            ptr.left = nptr;
```
```
            ptr.leftThread = false;
```
```
        }
```
```
    }
```
```
 
```
```
    /** function to find node **/
```

    public TBSTNode findNode(TBSTNode r, int ele)

```
    {
```
```
        if (r.ele < ele)
```
```
        {
```
```
            if (r.rightThread)
```
```
                return r;
```

            return findNode(r.right, ele);

```
        }
```
```
        else if (r.ele > ele)
```
```
        {
```
```
            if (r.leftThread)
```
```
                return r;
```

            return findNode(r.left, ele);

```
        }
```
```
        else
```
```
            return null;        
```
```
    }
```
```
 
```

    /** Function to search for an element **/

```
    public boolean search(int ele) 
```
```
    {
```

        return findNode(root, ele) == null;

```
    }
```
```
 
```
```
    /** Function to print tree **/
```
```
    public void inOrder() 
```
```
    {
```
```
        TBSTNode temp = root;
```
```
        for (;;)
```
```
        {
```
```
            temp = insucc(temp);
```
```
            if (temp == root)
```
```
                break;
```

            System.out.print(temp.ele +" ");

```
        }
```
```
    } 
```
```
 
```

    /** Function to get inorder successor **/

    public TBSTNode insucc(TBSTNode tree)

```
    {
```
```
        TBSTNode temp;
```
```
        temp = tree.right;
```
```
        if (!tree.rightThread)
```
```
            while (!temp.leftThread)
```
```
                temp = temp.left;
```
```
        return temp;
```
```
    }
```
```
}
```
```
 
```

/** Class ThreadedBinarySearchTreeTest **/

public class ThreadedBinarySearchTreeTest

```
{
```

    public static void main(String[] args)

```
    {                 
```

        Scanner scan = new Scanner(System.in);

        /** Creating object of ThreadedBinarySearchTree **/

        ThreadedBinarySearchTree tbst = new ThreadedBinarySearchTree();

        System.out.println("Threaded Binary Search Tree Test\n");

```
        char ch;
```

        /**  Perform tree operations  **/

```
        do    
```
```
        {
```

            System.out.println("\nThreaded Binary Search Tree Operations\n");

            System.out.println("1. insert ");

            System.out.println("2. search");

            System.out.println("3. clear");

```
 
```

            int choice = scan.nextInt();

```
            switch (choice)
```
```
            {
```
```
            case 1 : 
```

                System.out.println("Enter integer element to insert");

                tbst.insert( scan.nextInt() );

                break;

```
            case 2 : 
```

                System.out.println("Enter integer element to search");

                System.out.println("Search result : "+ tbst.search( scan.nextInt() ));

```
                break;       
```
```
            case 3 : 
```

                System.out.println("\nTree Cleared\n");

```
                tbst.clear();
```
```
                break;           
```
```
            default : 
```

                System.out.println("Wrong Entry \n ");

```
                break;   
```
```
            }
```
```
            /**  Display tree  **/ 
```

            System.out.print("\nTree = ");

```
            tbst.inOrder();            
```
```
            System.out.println();
```
```
 
```

            System.out.println("\nDo you want to continue (Type y or n) \n");

            ch = scan.next().charAt(0);

        } while (ch == 'Y'|| ch == 'y');

```
    }
```
```
}
```

venereology answered 1 month ago

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