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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It compiles.
B) It does not compile.
C) It throws an exception at runtime.

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

3. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) PT0D
B) It throws an exception
C) PT6H
D) PT0H
E) Compilation fails

4. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [d]
B) An IndexOutOfBoundsException is thrown
C) [c, b]
D) [d, b]
E) [a, b]
F) An UnsupportedOperationException is thrown

5. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 666 666
B) 666 42
C) 42 42
D) Compilation fails

Solutions: