添加到双向链接列表

Question

private class Node{
int num;
Node next;
Node prev;
Node (int num){
this.num=num;
this.next=null;
this.prev=null;
}
}

Scanner sc = new Scanner(System.in);
System.out.println("Enter file name");
String fileName = sc.next();
Scanner s = new Scanner (new File(fileName));
while(s.hasNextLine()){
    //No idea           
}

File example:

 //Skip this 3 6 2
 a 3 b 8
 2 3 4

I want to be able to go through each line of the file, skip everything in the comments, and put just the first two numbers of each line into a doubly linked list. I have been trying for awhile but I am new to doubly linked lists and I can't figure this out. Also I want to be able to do this without using ArrayList.

Answer 1

Take each line as a string eg: String temp = sc.nextLine();

Check it the first char is '/', if it isn't then break the String into a char[] eg: char [] numbers = temp.toCharArray(); Then you have access to which ever parts of the string you want. Sorry about the formatting I'm still in bed answering on my phone, no formatting possible ;-) Actually you could just split the String into a char[] first up, up to you. There are always multiple ways of doing this.