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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are enabled and the input argument isn't null
B) Only if assertions are disabled and the input argument isn't null
C) Only if assertions are disabled and the input argument is null
D) Only if assertions are enabled and the input argument is null
E) A NullPointerException is never thrown

2. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 10
B) 12
C) 14
D) 11

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

A) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
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's iterator reflects all additions, removals, or changes to the list since the iterator was created.
D) The CopyOnWriteArrayList class does not allow null elements.
E) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.

4. 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 \s
green\s
blue \s
""";
C) java
String colors = """
red \
green\
blue \
""";
D) java
String colors = """
red \t
green\t
blue \t
""";
E) java
String colors = """
red
green
blue
""";

5. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 0
B) Compilation fails
C) 1
D) 2
E) Optional.empty
F) Optional[1]
G) An exception is thrown

Solutions: