Java Exercises: Get the Postorder traversal of its nodes' values of a given a binary tree
Java Basic: Exercise-127 with Solution
Write a Java program to get the Postorder traversal of its nodes' values of a given a binary tree.
Sample Binary Tree
Postorder Traversal:
Sample Solution:
Java Code:
class Node
{
int key;
Node left, right;
public Node(int item)
{
key = item;
left = right = null;
}
}
class BinaryTree
{
// Root of Binary Tree
Node root;
BinaryTree()
{
root = null;
}
// Print the nodes of binary tree
void print_Postorder(Node node)
{
if (node == null)
return;
print_Postorder(node.left);
print_Postorder(node.right);
System.out.print(node.key + " ");
}
// Wrappers over above recursive functions
void print_Postorder()
{
print_Postorder(root);
}
public static void main(String[] args)
{
BinaryTree tree = new BinaryTree();
tree.root = new Node(55);
tree.root.left = new Node(21);
tree.root.right = new Node(80);
tree.root.left.left = new Node(9);
tree.root.left.right = new Node(29);
tree.root.right.left = new Node(76);
tree.root.right.right = new Node(91);
System.out.println("\nPostorder traversal of binary tree is: ");
tree.print_Postorder();
}
}
Sample Output:
Postorder traversal of binary tree is: 9 29 21 76 91 80 55
Flowchart:
Java Code Editor:
Contribute your code and comments through Disqus.
Previous: Write a Java program to get the inorder traversal of its nodes' values of a given a binary tree.
Next: Write a Java program to calculate the median of unsorted array of integers, find the median of it.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
Java: Tips of the Day
How to sort an ArrayList?
Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
Ref: https://bit.ly/32urdSe
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework