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but in runtime it prints that result is null, that’s what I’m saying

Maybe because in Java when a String is `null` and is treated as `"null"` if we apply String operations other than condition checking
For eg in Java:
```
String s1 = null;
String s2 = "test";
String s3 = s1 + s2;
System.out.println(s3);
```
The above snippet prints `nulltest`.

So as it is forced to return `String` then  guess it is returning `"null"` but at time of condition checking it is unboxed sort of as a `null`.

*If the reference is null, it is converted to the string `"null"`*
<https://docs.oracle.com/javase/specs/jls/se8/html/jls-5.html#jls-5.1.11>