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BinaryTree.java

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import java.util.*;

public class BinaryTree

{

private TreeNode root;

private class TreeNode

{

private TreeNode left;

private TreeNode right;

private int data;

public TreeNode(int data)

{

this.data=data;

}

public void CreateBinaryTree()

{

TreeNode first=new TreeNode(1);

TreeNode second=new TreeNode(2);

TreeNode third=new TreeNode(3);

TreeNode fourth=new TreeNode(4);

TreeNode fifth=new TreeNode(5);

TreeNode sixth=new TreeNode(6);

//insertion of the data to the nodes

root=first;

first.left=second;

first.right=third;

second.left=fourth;

second.right=fifth;

third.left=sixth;

}

//preorder traversal of the binarry tree:

public void preOrder(TreeNode root)

{

if (root==null)

{

return;

}

System.out.println(root.data+" ");

preOrder(root.left);

preOrder(root.right);

}

public static void main(String[] args)

{

BinaryTree bt =new BinaryTree();

bt.CreateBinaryTree();

bt.preOrder(bt.root);

}