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Driver Program to Test Tree in JAVA

Driver Program to Test Tree:-

A basic driver program to test all the functions that i will posting in my blogs using this sample tree.







package com.BST;

public class BSTOperation {

 /**
  * @param args
  */
 public static void main(String[] args) {
  
  BinarySearchTree btree=new BinarySearchTree();
  btree.inorder(btree.root);
  Node node1=new Node(8);
  Node node2=new Node(3);
  Node node3=new Node(1);
  Node node4=new Node(6);
  Node node5=new Node(4);
  Node node6=new Node(7);
  Node node7=new Node(10);
  Node node8=new Node(14);
  Node node9=new Node(13);
  
  btree.root=btree.insert(node1, btree.root);
  btree.inorder(btree.root);
  System.out.println("");
  btree.root=btree.insert(node2, btree.root);
  btree.inorder(btree.root);
  System.out.println("");
  btree.root=btree.insert(node3, btree.root);
  btree.inorder(btree.root);
  System.out.println("");
  btree.root=btree.insert(node4, btree.root);
  btree.inorder(btree.root);
  System.out.println("");
  btree.root=btree.insert(node5, btree.root);
  btree.inorder(btree.root);
  System.out.println("");
  btree.root=btree.insert(node6, btree.root);
  btree.inorder(btree.root);
  System.out.println("");
  btree.root=btree.insert(node7, btree.root);
  btree.inorder(btree.root);
  System.out.println("");
  btree.root=btree.insert(node8, btree.root);
  btree.inorder(btree.root);
  System.out.println("");
  btree.root=btree.insert(node9, btree.root);
  System.out.println("Inorder");
  btree.inorder(btree.root);
  System.out.println("");
  System.out.println("post order");
  btree.postOrder(btree.root);
  System.out.println("");
  System.out.println("pre order");
  btree.preOrder(btree.root);
 }

}

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Deleting a Node by passing data in LInkedList

Deleting a Node by passing data in LInkedList:-

The node can be deleted by passing the data value in a function.Here we have three pointers one to traverse the list other to point current node and third one to point previous of current node.



//deleting a given keypublic Node deleteKeyNode(Node head,int key){//traverse pointer Node temp=head;//previous pointer Node prevtemp=temp;while(temp!=null){//when key is at head positionif(key==head.data){ head=head.next; System.out.println("head is deleted");return head;}//when key is at any position other than headif(temp.data==key){ prevtemp.next=temp.next; temp.next=null; temp=prevtemp;} prevtemp=temp; temp=temp.next;}return head;}