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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.execute(task1);
B) execService.submit(task1);
C) execService.submit(task2);
D) execService.call(task1);
E) execService.call(task2);
F) execService.run(task1);
G) execService.run(task2);
H) execService.execute(task2);

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

A) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
B) The unnamed module exports all of its packages.
C) Code in an explicitly named module can access types in the unnamed module.
D) 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.
E) The unnamed module can only access packages defined in the unnamed module.
F) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.

3. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42, 10);
B) None of the suggestions.
C) var concurrentHashMap = new ConcurrentHashMap();
D) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
E) var concurrentHashMap = new ConcurrentHashMap(42);

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

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

5. A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?

A) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
B) bash
CopyEdit
javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
C) css
CopyEdit
javac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
D) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop

Solutions: