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Oracle 1z1-830 Exam Syllabus Topics:

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 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's iterator reflects all additions, removals, or changes to the list since the iterator was created.
E) The CopyOnWriteArrayList class does not allow null elements.

2. Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}

A) stringBuilder3
B) stringBuilder1
C) None of them
D) stringBuilder2
E) stringBuilder4

3. Which of the following methods of java.util.function.Predicate aredefault methods?

A) not(Predicate<? super T> target)
B) test(T t)
C) isEqual(Object targetRef)
D) or(Predicate<? super T> other)
E) and(Predicate<? super T> other)
F) negate()

4. Which of the following statements are correct?

A) You can use 'private' access modifier with all kinds of classes
B) None
C) You can use 'public' access modifier with all kinds of classes
D) You can use 'protected' access modifier with all kinds of classes
E) You can use 'final' modifier with all kinds of classes

5. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) nothing
B) static
C) Compilation fails
D) default

Solutions: