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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) integer
B) string
C) long
D) It throws an exception at runtime.
E) nothing
F) Compilation fails.

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) PT8784H
P1Y
C) P1Y
PT8784H
D) P1Y
UnsupportedTemporalTypeException

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

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

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

Solutions: