Quiz: Java Interview Questions

5 questionsNo time limitPass: 60%+10 XP on first pass

The 25 Java questions asked most in campus and off-campus interviews, with crisp answers and code where it helps — JVM, OOP, strings, collections, exceptions and Java 8.

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Question 1
Can a static method be overridden?
YesNo — it can only be hiddenOnly in interfacesOnly if it is final

Question 2

What does this print?

public class Main {
    public static void main(String[] args) {
        String s = "Hi";
        StringBuilder sb = new StringBuilder("Hi");
        System.out.println(s.equals(sb.toString()) + " " + s.equals(sb));
    }
}

true truetrue falsefalse falsefalse true

Question 3
Which is used to implement the Singleton pattern?
A public constructorA private constructor with a static instanceAn abstract classA final method
Question 4
When does the finally block NOT run?
When an exception is caughtWhen there is a return in tryWhen System.exit() is called in tryNever — it always runs
Question 5
flatMap is used to:
Sort a streamTurn each element into a stream and merge them into one streamRemove null valuesCount elements