1 public class emptystring
2 {
main(String[] args)3         public static void main(String[] args)
4         {
5                 System.out.println("null".equals(n(0) + ""));
6                 System.out.println("null".equals("" + n(0)));
7                 System.out.println("x".equals(n(1) + ""));
8                 System.out.println("x".equals("" + n(1)));
9         }
10 
n(int i)11         static String n(int i)
12         {
13                 if (i==0) return null; else return "x";
14         }
15 }
16