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

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

3. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim bam boom
B) bim boom
C) Compilation fails.
D) bim boom bam
E) bim bam followed by an exception

4. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) False
B) True

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

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

Solutions: