Question

Design a class called TreeNode (the class java file should be called TreeNode.java) that encodes a binary tree node with integral values, with the following (exact) fields and methods/constructors: Description The integral data store in the node Link to the left subtree Link to the right subtree Fields and Methods Fields Data Left Right Methods TreeNode A constructor with no parameters that initialized the fields Design a class called TreeNodeWrapper (the class java file should be called TreeNodeWrapper.java that encodes a wrapper for the TreeNode class, with the following (exact) fields and methods/constructors: Fields and Methods Description Fields TreeNodeRef A reference to a tree node Left Link to the left subtree Link to the right subtree Return the TreeNode from the wrapper Add a TreeNode to the wrapper Right Methods get set

show output as well

Answer 1

        
        class TreeNode {
                private int data;
                private TreeNode left, right;
                
                public TreeNode() {
                        data = 0;
                        left = null;
                        right = null;
                }
                public int getData() {
                        return data;
                }
                public void setData(int data) {
                        this.data = data;
                }
                public TreeNode getLeft() {
                        return left;
                }
                public void setLeft(TreeNode left) {
                        this.left = left;
                }
                public TreeNode getRight() {
                        return right;
                }
                public void setRight(TreeNode right) {
                        this.right = right;
                }
        }
        
        class TreeNodeRef {
                private TreeNode treeNodeRef;
                private TreeNodeRef left, right;

                public TreeNode get() {
                        return treeNodeRef;
                }
                public void set(TreeNode t) {
                        treeNodeRef = t;
                }
                
        }

the question asks just to code the classes, there is no as such main method given or asked to code, which could show the output.. I am not sure for what purpose you are using these classes.. If you provide some info about the project in whcih the classes are getting used, then probably some main class can be written. Thanks!