基本上,我通过从文本文件中读取一组整数来实现 AVL 树,然后使用 add() 方法填充树。此外,该程序应该按整数集的顺序打印。
当我运行程序时,会弹出 StackOverflowError。我认为这个错误是由于 add() 方法出现故障而触发的。
如果有人帮助我,我真的很感激,因为我是这种编程的新手。
这是主类的一部分:
public static void main(String[] args) throws FileNotFoundException
{
AVL s1 = new AVL();
Scanner file = new Scanner(new File("C:\\Users\\Dell\\Desktop\\integers.txt"));
while(file.hasNext())
{
// String str = file.next();
//int b = Integer.parseInt(str);
int b = file.nextInt();
s1.add(b);
}
v1.PrintInOrder(v1.root);
这些是 add() 和 PrintInOrder() 方法:
public boolean add(int key)
{
root = add(root, key);
return true;
}
private Node add(Node b1, int key)
{
if(b1 == null)
{
return new Node(key);
}
if(key < b1.element){
b1.left = add(b1.left, key);
}
else
{
b1.right = add(b1.right, key);
}
int Left_Height = getHeight(b1.left);
int Right_Height = getHeight(b1.right);
// a height imbalance requires that two subtrees differ by two
if(Math.abs(LeftHeight - RightHeight )== 2)
return Balance(n1);
else
{
n1.ResetHeight();
return b1;
}
}
public void PrintInOrder(Node b1){
if(b1 != null){
PrintInOrder(b1.left);
System.out.println(b1.element);
PrintInOrder(b1.right);
}
}
这是节点类:
public class Node {
Node left;
Node right;
int element;
int height;
public Node(int keys){
this(keys, null, null);
}
public Node(int d, Node right1, Node left1){
element = d;
height = 0;
left = left1;
right = right1;
}
// This method recalculates the height if the right or left subtrees have been altered
public void ResetHeight(){
int LeftHeight = AVL.getHeight(left);
int RightHeight = AVL.getHeight(right);
height = 1 + Math.max(LeftHeight,RightHeight);
}