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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A) An exception is thrown at runtime.
B) Sum: 22.0, Max: 8.5, Avg: 5.0
C) Compilation fails.
D) Sum: 22.0, Max: 8.5, Avg: 5.5

2. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) static
B) nothing
C) Compilation fails
D) default

3. 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) 1
B) It throws an exception at runtime.
C) Compilation fails.
D) 2
E) 0

4. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) SmartPhone interface does not compile
B) Everything compiles
C) An exception is thrown at running Iphone15.ring();
D) Iphone15 class does not compile

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

Solutions: