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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

3. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 1 2 2
B) 1 1 1 1
C) 1 1 2 3
D) 5 5 2 3
E) 1 5 5 1

4. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) JamesJeanne
B) JeanneJames
C) MissingResourceException
D) Compilation fails
E) Jeanne
F) James

5. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) US=UK
B) Compilation fails.
C) =US-UK
D) -US=UK
E) US-UK
F) An exception is thrown.

Solutions: