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import java.util.ArrayList;
import java.util.List;
public class BinaryTreeToLinkedList {
private List<String> treeNodesAsList;
public BinaryTreeToLinkedList() {
this.treeNodesAsList = new ArrayList();
}
public void preOrderBinaryTreeTraversal(TreeNode node) {
if (node == null) {
return;
}
treeNodesAsList.add(node.data);
preOrderBinaryTreeTraversal(node.left);
preOrderBinaryTreeTraversal(node.right);
}
public void printTreeElementAsList() {
System.out.println(String.join(" -> ", treeNodesAsList));
}
public List<String> getTreeNodesAsList() {
return treeNodesAsList;
}
static class TreeNode {
public String data;
public TreeNode left;
public TreeNode right;
public TreeNode(String data, TreeNode left, TreeNode right) {
this.data = data;
this.left = left;
this.right = right;
}
}
}
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