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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) 10
B) It throws an exception.
C) Compilation fails.
D) _$

2. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) It throws an exception at runtime.
B) 2
C) 1
D) Compilation fails.
E) 0

3. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) An ArrayIndexOutOfBoundsException is thrown at runtime.
B) Chanel
C) Compilation fails.
D) Chanel Dior Louis Vuitton

4. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MM dd
B) MMMM dd
C) MMM dd
D) MM d

5. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap();
B) var concurrentHashMap = new ConcurrentHashMap(42);
C) None of the suggestions.
D) var concurrentHashMap = new ConcurrentHashMap(42, 10);
E) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);

Solutions: