Modify Listing 25.9, BSTAnimation.java, to add three new buttons?Show Inorder, Show Preorder, and Show Postorder?to display the result in a label, as shown in Figure 25.24. You need also to modify BST.java to implement the inorderList(), preorderList(), and postorderList() methods so that each of these methods returns a List of the node elements in inorder, preorder, and postorder, as follows:

Listing

public java.util.List inorderList(); public java.util.List preorderList(); public java.util.List postorderList(); Inorder: [10, 12, 13, 23, 45, 47, 56] 56 is inserted in the tree 45 12 47 10 23) 56 13) Enter a key: 56 Insert Delete Show Inorder Show Preorder Show Postorder