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javarecursionmethodsstatictowers-of-hanoi

non-static method towersOfHanoi(int, int, int, int) cannot be referenced from a static context?


When i compile the tester, it says that in line 9:

non-static method towersOfHanoi(int, int, int, int) cannot be referenced from a static context

Why cant it reach the towersOfHanoi method?

I provided the two classes below.

import java.io.*;
import java.util.*;
public class Tester
{
    public static void main(String args[])
    {
        Scanner swag = new Scanner(System.in);
        int yolo = swag.nextInt();
        TowersOfHanoi.towersOfHanoi(yolo,1,3,2);
    }
}
public class TowersOfHanoi
{
    public void towersOfHanoi (int N, int from, int to, int spare)
    {
        if(N== 1) 
        {
            moveOne(from, to);
        }
        else 
        {
            towersOfHanoi(N-1, from, spare, to);
            moveOne(from, to);
            towersOfHanoi(N-1, spare, to, from);
        }
    }  

    private void moveOne(int from, int to)
    {
        System.out.println(from + " ---> " + to);
    }
}

Solution

  • Problem is this line

    TowersOfHanoi.towersOfHanoi(yolo,1,3,2);
    

    either create an object of TowersOfHanoi and invoke method on that or declare your method TowersOfHanoi.towersOfHanoi as static.