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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) True
B) False

2. Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

A) UnsupportedTemporalTypeException
B) P1Y
UnsupportedTemporalTypeException
C) PT8784H
P1Y
D) P1Y
PT8784H

3. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 12
B) 14
C) 10
D) 11

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

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

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

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

Solutions: