(#5) Tricky Java Questions for Interviews

Q1: What’s the output printed to console?

public static void main(String[] args) {
    System.out.println(null instanceof Object);
}

Q2: Why text files and binary files are separated in new Java NIO API? In theory, text files are represented also in binary format internally.

Q3: Which of the following statement is a best practice? Please select one or multiple options:

1. Never pass null as value for a method parameter.
2. Never pass Optional as value for a method parameter.
3. In order to fail-fast, checks for null values should be done at Service Layer.