Oracle 1z0-830 test insides dumps : Java SE 21 Developer Professional

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. 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 -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 --module-source-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

3. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) James
B) Compilation fails
C) Jeanne
D) MissingResourceException
E) JeanneJames
F) JamesJeanne

4. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) An exception is thrown.
B) Compilation fails.
C) ABC
D) abc

5. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42 k
B) 42000
C) 42000E
D) 42 000,00 €

Solutions: