我在运行程序时遇到StackOverflow错误，而不是找到Knights Tour。任何想法导致这个以及如何改变我的代码以实际找到骑士之旅并摆脱这个错误。项目是我的CS280课程，将于周五到期请帮忙。谢谢！！
public class KnightsTourDriver {
public static void main (String[]args) {
KnightsTour tour1 = new KnightsTour;
tour1.findTour(1);
tour1.displayTour();
}
}
import java.util.Arrays;
class KnightsTour
{
static int the_board[][] = new int[8][8];
int the_tour[][] = new int [8][8];
int k,moves = 0;
int x = 0, y = 0;
int z, j = 1;
boolean tour_found, isSafe;
//fills 2D array with 0's
public KnightsTour()
{
for (int i = 0; i < 8; i++)
{
for (int r = 0; r < 8; r++)
{
the_board[i][r] = 0;
}
}
}
/*recursive method, checks how many moves were made if 16 were made tour finished,
else if not moves knight checks if the move is valid if not back tracks*/
public void findTour(int q)
{
if(moves == 64)
{
tour_found = true;
}
else
move(q);
if(isSafe == true)
{
findTour(q++);
moves++;
}
else
if(isSafe == false)
{
findTour(q*(-1));
moves--;
}
}
//used to keep prevent arrayindexoutofbounds error
public boolean arrayInBounds(int x, int y)
{
if(x < 8 && y < 8 && x >= 0 && y >= 0)
{
return true;
}
else return false;
}
/*move method uses switch statement to decide which move the knight should make
based on a case number, negative case numbers back track knight. if statement checks
if the current array element is empty and the index is inbounds*/
public void move(int a)
{
switch (a)
{
case 1:
if(arrayInBounds(x+2, y+1) == true){
if(the_board[x+2][y+1] != 0){
the_board[x+2][y+1]=j;
j++;
break;
}
else isSafe = false;
break;
}
else isSafe = false;
case 2:
if (arrayInBounds(x+1, y+2) == true){
if(the_board[x+1][y+2] != 0){
the_board[x+1][y+2]=j;
j++;
break;
}
else isSafe = false;
break;
}
else isSafe = false;
case 3:
if(arrayInBounds(x-1, y+2) == true){
if(the_board[x-1][y+2] != 0){
the_board[x-1][y+2]=j;
j++;
break;
}
else isSafe = false;
break;
}
else isSafe = false;
case 4:
if (arrayInBounds(x-2, y+1) == true){
if(the_board[x-2][y+1] != 0){
the_board[x-2][y+1]=j;
j++;
break;
}
else isSafe = false;
break;
}
else isSafe = false;
case 5:
if(arrayInBounds(x-2, y-1) == true){
if(the_board[x-2][y-1] != 0){
the_board[x-2][y-1]=j;
j++;
break;
}
else isSafe = false;
break;
}
else isSafe = false;
case 6:
if(arrayInBounds(x-1, y-2) == true){
if(the_board[x-1][y-2] != 0){
the_board[x-1][y-2]=j;
j++;
break;
}
else isSafe = false;
break;
}
else isSafe = false;
case 7:
if(arrayInBounds(x+1, y-2) == true){
if(the_board[x+1][y-2] != 0){
the_board[x+1][y-2]=j;
j++;
break;
}
else isSafe = false;
break;
}
else isSafe = false;
case 8:
if(arrayInBounds(x+2, y-1) == true){
if(the_board[x+2][y-1] != 0){
the_board[x+2][y-1]=j;
j++;
break;
}
else isSafe = false;
break;
}
else isSafe = false;
case -1:
j--;
tryNextMove(a);
break;
case -2:
j--;
tryNextMove(a);
break;
case -3:
j--;
tryNextMove(a);
break;
case -4:
j--;
tryNextMove(a);
break;
case -5:
j--;
tryNextMove(a);
break;
case -6:
j--;
tryNextMove(a);
break;
case -7:
j--;
tryNextMove(a);
break;
case -8:
j--;
tryNextMove(a);
break;
}
}
public void tryNextMove(int m)
{
move(m++);
}
//for loop to display tour once found//
public void displayTour()
{
int v = 1;
for (int i = 0; i < 8; i++)
{
for (int e = 0; e < 8; e++)
{
if(v % 8 == 0)
{
System.out.print(the_board[i][e] + "\t");
System.out.println("\n");
}
else
System.out.print(the_board[i][e] + "\t");
v++;
}
}
}
}
答案 0 :(得分：1)
如果您的算法确实需要大量的递归调用，您可以在启动时将参数传递给JVM以增加堆栈大小的限制：-Xss4m
当然，如果您的算法无限制地递归，这只会延迟问题。
答案 1 :(得分：0)
你需要在交换机的case语句中有一些中断，否则它会失效。