What is solution for this code please help

Question

import java.util.Scanner;

public class Test

{

public void demo()

{

int num,n;

Scanner obj=new Scanner(System.in);

System.out.println("Enter a number");

num=obj.nextInt();

n=comp(num);

System.out.println("Your number is " +n);

}

public static int comp(int a)

{

return (a>0)? "positive" : "negative";

}

}