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Oracle Java SE 21 Developer Professional Sample Questions:

1. 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 is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
C) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
D) The CopyOnWriteArrayList class does not allow null elements.
E) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.

2. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

A) It prints "Task is complete" twice and throws an exception.
B) It prints "Task is complete" twice, then exits normally.
C) It prints "Task is complete" once, then exits normally.
D) It prints "Task is complete" once and throws an exception.
E) It exits normally without printing anything to the console.

3. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) None of the propositions
B) java
String colors = """
red \t
green\t
blue \t
""";
C) java
String colors = """
red \
green\
blue \
""";
D) java
String colors = """
red
green
blue
""";
E) java
String colors = """
red \s
green\s
blue \s
""";

4. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
B) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5

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

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

Solutions: