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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Which of the following isn't a valid option of the jdeps command?

A) --list-reduced-deps
B) --print-module-deps
C) --generate-open-module
D) --check-deps
E) --list-deps
F) --generate-module-info

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

4. 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.generate(() -> "a");
C) Stream stream = Stream.ofNullable("a");
D) Stream stream = Stream.of();
E) Stream stream = Stream.empty();
F) Stream stream = new Stream();

5. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) Iphone15 class does not compile
B) Everything compiles
C) An exception is thrown at running Iphone15.ring();
D) SmartPhone interface does not compile

Solutions: