Create BinarySearchTree.java

solutions/java/BinarySearchTree.java

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+/*
+ * Program to create a binary search tree.
+ * Author: Viveka Aggarwal
+ */
+
+public class BinarySearchTree {
+	Node root;
+	public class Node {
+		Node left;
+		Node right;
+		Integer data;
+
+		Node() {
+		}
+
+		Node(Integer data) {
+			left = right = null;
+			this.data = data;
+		}
+	}
+
+	BinarySearchTree() {
+		root = new Node();
+	}
+
+	BinarySearchTree(Integer data) {
+		root = new Node(data);
+	}
+
+	public void addToTree(Integer data) {
+		addToTree(root, data);
+	}
+
+	private void addToTree(Node curr, Integer data) {
+		if(curr == null) {
+			curr = new Node(data);
+		} else if(curr.data.compareTo(data) >= 0) {
+			if(curr.left == null)
+				curr.left = new Node(data);
+			else
+				addToTree(curr.left, data);
+		} else {
+			if(curr.right == null)
+				curr.right = new Node(data);
+			else
+				addToTree(curr.right, data);
+		}
+	}
+
+	@Override
+	public String toString() {
+		return toString(this.root);
+	}
+
+	String toString(Node curr) {
+		if(curr == null)
+			return "";
+		return toString(curr.left) + " " + curr.data + " " + toString(curr.right);
+	}
+
+	public static void main(String[] args) {
+		BinarySearchTree tree = new BinarySearchTree(1);
+		tree.addToTree(5);
+		tree.addToTree(3);
+		tree.addToTree(89);
+		tree.addToTree(43);
+		tree.addToTree(43);
+		tree.addToTree(67);
+
+		System.out.println(tree.toString());
+	}
+}