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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following isn't a valid option of the jdeps command?

A) --generate-open-module
B) --list-reduced-deps
C) --generate-module-info
D) --check-deps
E) --print-module-deps
F) --list-deps

2. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) It throws an exception at runtime.
C) It's a double with value: 42
D) It's an integer with value: 42
E) null
F) Compilation fails.

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

4. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) An exception is thrown.
B) 0 1 2 3
C) 0 1 2
D) 1 2 3 4
E) 1 2 3
F) Compilation fails.

5. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {b=1, c=2, a=3}
B) {b=1, a=3, c=2}
C) {c=2, a=3, b=1}
D) {a=3, b=1, c=2}
E) {a=1, b=2, c=3}
F) {c=1, b=2, a=3}
G) Compilation fails

Solutions: