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Oracle Java SE 21 Developer Professional Sample Questions:

1. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) Compilation fails
B) Optional[Java]
C) null
D) Java

2. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 3 only
B) Line 1 only
C) The program successfully compiles
D) Line 1 and line 2
E) Line 2 only
F) Line 1 and line 3
G) Line 2 and line 3

3. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

A) ClassCastException
B) Compilation fails
C) NotSerializableException
D) 2
E) 1

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

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

5. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) An exception is thrown at runtime
B) Compilation fails
C) false
D) 3.3
E) true

Solutions: