Java null problems

Question

Node<Integer> soln = question(n,n,null);

where question(n,n,null) returns null, now i want to output the result as "no solution";

i wrote

Node<Integer> soln = question(n,n,null);
if(soln==null) System.out.println("no solution");

An error occurs, what shall i do?

Answer 1

Looks like question has a void return type. That would explain your error. Likely you want it to return an Integer.

Answer 2

Syntax error somewhere else?

This works just fine for me:

public class Node 
{
    public static void main(String[] args)
    {
        Node s = question(1,2,null);
        if (s == null)
            System.out.println("No solution");

    }

    public static Node question(int x, int y, String z)
    {
        if (z == null)
            return null;
        return new Node();
    }

}