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Binary Search Tree in Java implementation (reference based, dynamic memory)

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import java.util.Scanner;
 class BST {
    static BST.Node root = null;
    public void insert(int num) {
        if (root == null) {
            root = new BST.Node(num);
        } else {// root node is not empty
            BST.Node temp = root;
            while (temp != null) {

                if (num <= temp.getVal()) {
                    if (temp.getLeft() != null)
                        temp = temp.getLeft();
                    else {
                        temp.setLeft(new Node(num));
                        break;
                    }
                } else {
                    if (temp.getRight() != null)
                        temp = temp.getRight();
                    else {


                        temp.setRight(new Node(num));
                        break;
                    }

                }

            }


        }
    }

    public void search(int num, Node root) {
        if (root == null) {
            System.out.println("Number is not present ");
            return;
        }
        if (root.getVal() == num) {
            System.out.println("Number is present ");
        } else {
            if (num < root.getVal()) search(num, root.getLeft());
            else search(num, root.getRight());
        }


    }

    public void display(Node root) {
        if (root == null)
            return;
        display(root.getLeft());
        System.out.println(" " + root.getVal() + " ");
        display(root.getRight());

    }

    public static void main(String[] args) {
        BST bst= new BST();
        byte choice = 0;
        while (choice != 4) {
            int num;

            Scanner in = new Scanner(System.in);
            System.out.print("\nPress \n1 to insert \n2. To search \n3. Display \n4 to exit->");
            choice = in.nextByte();
            switch (choice) {
                case 1:
                    System.out.print("Enter the number ->");
                    num = in.nextInt();
                    bst.insert(num);
                    break;
                case 2:
                    System.out.print("Enter the Number ");
                    num = in.nextInt();
                    bst.search(num, root);
                    break;
                case 3:
                    bst.display(root);


            }

        }

    }

    private static class Node {
        private int val;
        private Node left = null;
        private Node right = null;

        public Node(int i) {
            this.val = i;
        }

        public int getVal() {
            return val;
        }

        public void setVal(int val) {
            this.val = val;
        }

        public Node getLeft() {
            return left;
        }

        public void setLeft(Node left) {
            this.left = left;
        }

        public Node getRight() {
            return right;
        }

        public void setRight(Node right) {
            this.right = right;
        }

    }
}
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