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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim bam boom
B) bim boom
C) bim boom bam
D) bim bam followed by an exception
E) Compilation fails.

2. Which of the following doesnotexist?

A) They all exist.
B) BooleanSupplier
C) DoubleSupplier
D) BiSupplier<T, U, R>
E) Supplier<T>
F) LongSupplier

3. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) true
B) false
C) A ClassCastException is thrown.
D) A NullPointerException is thrown.
E) Compilation fails.

4. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) ArithmeticException
B) RuntimeException
C) Compilation fails
D) IOException

5. Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?

A) An exception is thrown
B) ok the 2024-07-10
C) Compilation fails
D) ok the 2024-07-10T07:17:45.523939600

Solutions: