﻿ Java: Inorder traversal of its node values of a binary tree # Java Exercises: Get the inorder traversal of its nodes' values of a given a binary tree.

## Java Basic: Exercise-126 with Solution

Write a Java program to get the inorder traversal of its nodes' values of a given a binary tree.
Example:{10, 20, 30, 40, 50}
Output: 40 20 50 10 30

Sample Binary Tree Inorder 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 in inorder
void print_Inorder(Node node)
{
if (node == null)
return;

print_Inorder(node.left);

// Print the data of node
System.out.print(node.key + " ");

print_Inorder(node.right);
}

void print_Inorder()
{
print_Inorder(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("\nInorder traversal of binary tree is: ");
tree.print_Inorder();
}
}
```
```

Sample Output:

```Inorder traversal of binary tree is:
9 21 29 55 76 80 91
```

Flowchart: Java Code Editor:

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## Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself.

```public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
return Arrays.stream(enumClass.getEnumConstants())
.collect(Collectors.toMap(Enum::name, Function.identity()));
}
```

Ref: https://bit.ly/3xXcFZt