Converting from Integer to Binary using Recursion in Java

Problem:

Write a recursive function that converts an integer into its binary number representation.

Output:

Not needed.

Solution:

public class ProblemF {
 
    private static String toBinary(int num)
    {
     if(!(num/2==0))
      return ""+ toBinary(num/2)+""+num%2+"";
      else
      return ""+1+"";
    }   
}