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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) bread:Baguette, dish:Frog legs, cheese.
B) bread:bread, dish:dish, cheese.
C) bread:Baguette, dish:Frog legs, no cheese.
D) Compilation fails.

2. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) nothing
B) static
C) Compilation fails
D) default

3. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) It throws an exception
B) PT0D
C) Compilation fails
D) PT6H
E) PT0H

4. Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}

A) stringBuilder2
B) stringBuilder4
C) None of them
D) stringBuilder1
E) stringBuilder3

5. 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.

Solutions: