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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) nothing
B) long
C) It throws an exception at runtime.
D) string
E) Compilation fails.
F) integer

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

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

3. 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: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
D) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6

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

A) 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.
B) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
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) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.

5. Which of the following doesnotexist?

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

Solutions: