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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's either 1 or 2
B) It's either 0 or 1
C) Compilation fails
D) It's always 2
E) It's always 1

2. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = new Stream();
B) Stream stream = Stream.of();
C) Stream stream = Stream.ofNullable("a");
D) Stream stream = Stream.empty();
E) Stream stream = Stream.generate(() -> "a");
F) Stream<String> stream = Stream.builder().add("a").build();

3. Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
B) The CopyOnWriteArrayList class does not allow null elements.
C) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
D) The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
E) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.

4. Which methods compile?

A) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
B) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
C) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
D) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp

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

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

Solutions: