Adding elements to the tree in depth first manner Program plan: Tree.java: Define the class “Tree”. Declare the private variable root from class “Node”. Define the class “Node”. It holds data and List of nodes. Define the “size()” function. Returns the number of nodes in the subtree. Define “Tree()” constructor Generate an empty tree. Define “Tree()” with one parameter. Generate a tree with one root node and no children. Define “addSubree()” method. Adds a subtree as last node. Define “size()”. Computes the size of the tree. Define the “preorder()” method for both tree with many nodes and a tree with one node. Traverses the tree in preorder. “preorder(root,v)” is called. For a tree with multiple nodes, Traverse the tree with given root node. Define the “depthFirst()” method. Traversing the tree in depth first manner. “ArrayList” is used to store the elements. Visitor.java: Define interface “Visitor” Calls the “visit(object data)” BinaryTreeTester.java: Import the required header files. Define “DepthFirstTester” class. Define the “main()” function. Create objects “t1” as root node and “t2,t3,t4,t5,t6,t7” as subtree. Create object for interface using lambda expression. Call the “depthFirst()” method using “t1”. Print the output.

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Chapter 17, Problem 9PE

Program Plan Intro

Adding elements to the tree in depth first manner

Program plan:

Tree.java:

Define the class “Tree”.

Declare the private variable root from class “Node”.

Define the class “Node”.

It holds data and List of nodes.

Define the “size()” function.

Returns the number of nodes in the subtree.

Define “Tree()” constructor

Generate an empty tree.

Define “Tree()” with one parameter.

Generate a tree with one root node and no children.

Define “addSubree()” method.

Adds a subtree as last node.

Define “size()”.

Computes the size of the tree.

Define the “preorder()” method for both tree with many nodes and a tree with one node.

Traverses the tree in preorder.

“preorder(root,v)” is called.

For a tree with multiple nodes,

Traverse the tree with given root node.

Define the “depthFirst()” method.

Traversing the tree in depth first manner.

“ArrayList” is used to store the elements.

Visitor.java:

Define interface “Visitor”

Calls the “visit(object data)”

BinaryTreeTester.java:

Import the required header files.

Define “DepthFirstTester” class.

Define the “main()” function.

Create objects “t1” as root node and “t2,t3,t4,t5,t6,t7” as subtree.

Create object for interface using lambda expression.

Call the “depthFirst()” method using “t1”.

Print the output.

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