About Question enthuware.ocpjp.ii.v11.2.3343 :

[ocpjp11user]

Hi)
Here is the question

3-7.png (15.36 KiB) Viewed 3671 times

The question is regarding firth option

Code: Select all

System.out.println(2+"");

When you concatenate anything with a String, `toString()` is called on that object and then concatenation happens. Since 2 is primitive, it first Autoboxed to Integer, and then

Code: Select all

Integer.toString

method is called.

p.s. If it was just

Code: Select all

System.out.println(2);

- that's fine no autoboxing, cause println - overloaded method and can take primitive int.

[admin]

I am not sure I understand your question. What are you asking?

[ocpjp11user]

The code `2+""`, will cause autoboxing, cause in order to concatenate primitive with string, java first transform primitive into object, and then call `toString()` on that object. So, option 5 is also correct answer.

[admin]

Oh ok, I see what you mean. Yes, that is a good point. Autoboxing does happen in this case with the non string operand. Fixed.
thank you for your feedback!