Enthuware

This question looks so specific. Do questions like this (requiring to know exact functionality of methods from API Classes) are common in exam OCAJP?

Yes, you will get some questions that require precise knowledge of some key classes and some of their methods. They are all covered in our questions. You don't need to worry about the rest.

admin wrote:Yes, you will get some questions that require precise knowledge of some key classes and some of their methods. They are all covered in our questions. You don't need to worry about the rest.

Your questions are sometimes hard, and this is good for practices.

If you do System.out.println(sb); it will indeed print "12345     " (without quotes) but the length will be 10.

I dit but it printed just "12345" with no blank spaces. something changed on Java 8?

Try printing this : System.out.println("\""+sb+"\"");
to know exactly what does sb contain.

Thank you Paul, the problem was that I was using an IDE(IntelliJ), and the output is different I don't know why.

I agree Know that is better don't use IDE for studying