Oracle Java SE 21 Developer Professional : 1z1-830 exam

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A. Compilation fails at line n1.
B. An exception is thrown at runtime.
C. Compilation fails at line n2.
D. Nothing
E. markdown
Inner class:
------------
Outer field

Question 2

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. default
B. static
C. Compilation fails
D. nothing

Question 3

Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A. 2 1 2
B. An exception is thrown.
C. 2 2 1
D. 2 2 2
E. 2 1 1
F. 1 2 1
G. 1 2 2
H. 1 1 1
I. 1 1 2

Question 4

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

Question 5

Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A. MyService service = ServiceLoader.getService(MyService.class);
B. MyService service = ServiceLoader.load(MyService.class).findFirst().get();
C. MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
D. MyService service = ServiceLoader.load(MyService.class).iterator().next();

Solutions: