public class JosephNode
{
 public int ID;  
 public int TurnID;  //˳Ðò
 public int next; //Ï൱ÓÚC++µÄÖ¸Õë
};


public class Joseph
{
 public static void main(String[] arg)
 {
  JosephNode node[] = new JosephNode[12];
  for(int i=0;i<node.length;i++)
  {
   node[i].ID = node[i].TurnID = i+1;
   node[i].next = (i+1)%node.length;
  }
  int left = 12,count = 0,i=0;
  while(left==1)
  {
   node[i].TurnID = (count++)%5;
   if(node[i].TurnID==0)
   {
    node[(left+i-1)%12].next++;
    left--;
   }
   i = node[i].next;
  }
  System.out.println("the "+i+" will out");
 }
};


//出错提示
Exception in thread "main" java.lang.NullPointerException
        at Joseph.main(Joseph.java:8)
Press any key to continue...

按你说的改了,出错提示：

Exception in thread "main" java.lang.NoSuchMethodError: main
Press any key to continue...

我俩个文件放在同一个文件夹里的.

可以不调用异常处理的,主要问题是我没有把下面那句加上.
   node[i] = new JosephNode();