Java 使用深度优先搜索算法的骑士之旅

Java 使用深度优先搜索算法的骑士之旅,java,depth-first-search,Java,Depth First Search,我正在尝试使用DFS制作程序knight tour,但我无法解决此程序。。因为我总是有这样的消息错误 线程“AWT-EventQueue-0”java.lang.ArrayIndexOutOfBoundsException中出现异常:-1 位于java.util.ArrayList.elementData(ArrayList.java:371) 获取(ArrayList.java:384) 在KnightTour.processKnightTour(KnightTour.java:82) 我希望

我正在尝试使用DFS制作程序knight tour,但我无法解决此程序。。因为我总是有这样的消息错误

线程“AWT-EventQueue-0”java.lang.ArrayIndexOutOfBoundsException中出现异常:-1 位于java.util.ArrayList.elementData(ArrayList.java:371) 获取(ArrayList.java:384) 在KnightTour.processKnightTour(KnightTour.java:82)

我希望有人能帮助我

public void processKnightTour(int indexX, int indexY){
    System.out.println(indexX);
    System.out.println(indexY);
    int[] x={2,2,-2,-2,1,1,-1,-1};
    int[] y={1,-1,1,-1,2,-2,2,-2};
    int countPath=0;
    workList = new ArrayList();
    node[indexX][indexY] = 1;
    workList.add(new Coordinate(indexX, indexY));
    current =(Coordinate) workList.get(workList.size()-1);
    boolean statusChild;
    while(node[current.row][current.column] != 64){
        statusChild = false;
        for(int loop=0; loop<8; loop++){
            if(current.row+x[loop]>=0 && current.row+x[loop]<=7 && current.column+y[loop]>=0 && current.column+y[loop]<=7){
                if(node[(current.row+x[loop])][(current.column+y[loop])]==0){
                    workList.add(new Coordinate(current.row+x[loop], current.column+y[loop], current));
                    statusChild = true;
                }                    
            }
        }
        if(statusChild == true){
            workList.remove(workList.indexOf(current));
        }else{
            if(workList.size()-2 >= 0){
                after = (Coordinate) workList.get(workList.size()-2);
                if(current.nodeParent.equals(after.nodeParent)){

                }else{
                    node[current.nodeParent.row][current.nodeParent.column] = 0;
                }
            }
            node[current.row][current.column] = 0;                
            workList.remove(workList.size()-1);
        }
        current = (Coordinate) workList.get(workList.size()-1);
        node[current.row][current.column] = (node[current.getParent().row][current.getParent().column])+1;
        countPath++;
        //System.out.println(countPath+", "+workList.size()+", "+node[current.column][current.row]);
    }

}
public void processKnightTour(int indexX,int indexY){
系统输出打印项次(indexX);
系统输出打印LN(索引);
int[]x={2,2,-2,1,1,-1};
int[]y={1,-1,1,-1,2,-2,2};
int countPath=0;
workList=newarraylist();
节点[indexX][indexY]=1;
添加(新坐标(indexX,indexY));
当前=(坐标)workList.get(workList.size()-1);
布尔状态子;
while(节点[current.row][current.column]!=64){
statusChild=false;
for(int loop=0;loop=0&¤t.row+x[loop]=0&¤t.column+y[loop]=0){
after=(坐标)workList.get(workList.size()-2);
if(current.nodeParent.equals(在.nodeParent之后)){
}否则{
节点[current.nodeParent.row][current.nodeParent.column]=0;
}
}
节点【当前行】【当前列】=0;
workList.remove(workList.size()-1);
}
当前=(坐标)workList.get(workList.size()-1);
节点[current.row][current.column]=(节点[current.getParent().row][current.getParent().column])+1;
countPath++;
//System.out.println(countPath+,“+workList.size()+”,“+node[current.column][current.row]);
}
}
在这段代码中,几乎在代码末尾,您是:

  • 首先在不知道列表中是否有元素的情况下删除元素
  • 其次,您尝试从一个列表中
    获取(worklist.size()-1)
    ,该列表的大小可以(也将是)为0

while循环中有一些不太正确的地方。我没有清楚地看到意图,但您应该以某种方式确保
工作列表
的使用正确。

谢谢您。。我的while循环有点不对劲..呵呵
        workList.remove(workList.size()-1);
    }
    current = (Coordinate) workList.get(workList.size()-1);