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78 lines (70 loc) · 1.86 KB
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class Node
{
int data;
Node left, right;
public Node(int item)
{
data = item;
left = right = null;
}
}
public class LevelOrderTraversal
{
// Root of the Binary Tree
Node root;
public LevelOrderTraversal()
{
root = null;
}
/* function to print level order traversal of tree*/
void printLevelOrder()
{
int h = height(root);
int i;
for (i=1; i<=h; i++)
printGivenLevel(root, i);
}
/* Compute the "height" of a tree -- the number of
nodes along the longest path from the root node
down to the farthest leaf node.*/
int height(Node root)
{
if (root == null)
return 0;
else
{
/* compute height of each subtree */
int lheight = height(root.left);
int rheight = height(root.right);
/* use the larger one */
if (lheight > rheight)
return(lheight+1);
else return(rheight+1);
}
}
/* Print nodes at the given level */
void printGivenLevel (Node root ,int level)
{
if (root == null)
return;
if (level == 1)
System.out.print(root.data + " ");
else if (level > 1)
{
printGivenLevel(root.left, level-1);
printGivenLevel(root.right, level-1);
}
}
/* Driver program to test above functions */
public static void main(String args[])
{
LevelOrderTraversal tree = new LevelOrderTraversal();
tree.root= new Node(1);
tree.root.left= new Node(2);
tree.root.right= new Node(3);
tree.root.left.left= new Node(4);
tree.root.left.right= new Node(5);
System.out.println("Level order traversal of binary tree is ");
tree.printLevelOrder();
}
}