Question: Consider the following methods: public static void preorder ( Node root, Stack s ) { if ( root ! = null ) { s .

Consider the following methods:
public static void preorder(Node root, Stack s){
if (root != null){
s.push(root.val);
preorder(root.left, s);
preorder(root.right, s);
}
}
public static void postorder(Node root, Stack s){
if (root != null){
postorder(root.left, s);
postorder(root.right, s);
root.val = s.pop();
}
}

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