這些都是我的領域:迭代方法BST
public class BSTSet <E> extends AbstractSet <E> {
// Data fields
private BSTNode root;
private int count = 0;
private Comparator<E> comp; // default comparator
/** Private class for the nodes.
* Has public fields so methods in BSTSet can access fields directly.
*/
private class BSTNode {
// Data fields
public E value;
public BSTNode left = null;
public BSTNode right = null;
// Constructor
public BSTNode(E v) {
value = v;
}
//creates a method called contains so that i can call it later on for my find method
public boolean contains(Object item) {
return contains(item);//root.value.equals(item);
}
public int height() {
return height();
}
}
// Constructors - can either use a default comparator or provide one
public BSTSet() {
comp = new ComparableComparator(); // Declared below
}
public BSTSet(Comparator <E> c) {
comp = c;
}
}
,這就是我試圖完成:
private class BSTSetIterator implements Iterator<E> {
private Stack<BSTNode> stack = new Stack<BSTNode>();
private BSTNode current = root;
public BSTSetIterator(BSTNode root) {
return new BSTSetIterator();
}
public boolean hasNext() {
boolean hasNext = false;
hasNext = !stack.isEmpty() || current != null;
return hasNext;
}
public E next() {
BSTNode next = null;
while (current != null) {
stack.push(current);
current = current.left;
}
next = stack.pop();
current = next.right;
return next;
}
public void remove() {
throw new UnsupportedOperationException();
}
}
// Comparator for comparable
private class ComparableComparator implements Comparator<E> {
public int compare(E ob1, E ob2) {
return ((Comparable)ob1).compareTo(ob2);
}
}
到目前爲止,代碼失敗的行return new BSTSetIterator();
和return next;
。對於return next
,它表示它返回的數據類型是錯誤的。我將如何去修復這些方法,以便我可以使用堆棧遍歷BST?
如何將您的班級更改爲'私人班級BSTSetIterator implements Iterator ' –
gtgaxiola