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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

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

4. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var a = 1;(Valid: var correctly infers int)
B) var f = { 6 };
C) var h = (g = 7);
D) var d[] = new int[4];
E) var e;
F) var b = 2, c = 3.0;

5. Which three of the following are correct about the Java module system?

A) The unnamed module exports all of its packages.
B) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
C) The unnamed module can only access packages defined in the unnamed module.
D) Code in an explicitly named module can access types in the unnamed module.
E) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
F) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.

Solutions: