1Z0-809 Exam Questions and Answers | Exam-Dumps.net (Page: 3)

QUESTION: 11

Given the code fragment:

Stream<List<String>> iStr= Stream.of (
Arrays.asList (“1”, “John”),
Arrays.asList (“2”, null)0;
Stream<<String> nInSt = iStr.flatMapToInt ((x) -> x.stream ());
nInSt.forEach (System.out :: print);

What is the result?

1John2null
12
A NullPointerException is thrown at run time.
A compilation error occurs.

Answer(s): D

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QUESTION: 12

Given the code fragment:

Path file = Paths.get (“courses.txt”);
// line n1

Assume the courses.txt is accessible.
Which code fragment can be inserted at line n1 to enable the code to print the content of the courses.txt file?

List<String> fc = Files.list(file); fc.stream().forEach (s - > System.out.println(s));
Stream<String> fc = Files.readAllLines (file); fc.forEach (s - > System.out.println(s));
List<String> fc = readAllLines(file); fc.stream().forEach (s - > System.out.println(s));
Stream<String> fc = Files.lines (file); fc.forEach (s - > System.out.println(s));

Answer(s): D

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QUESTION: 13

Given the code fragment:
public void recDelete (String dirName) throws IOException {
File [ ] listOfFiles = new File (dirName) .listFiles();
if (listOfFiles ! = null && listOfFiles.length >0) {
for (File aFile : listOfFiles) {
if (aFile.isDirectory ()) {
recDelete (aFile.getAbsolutePath ());
} else {
if (aFile.getName ().endsWith (“.class”))
aFile.delete ();
}
}
}
}

Assume that Projects contains subdirectories that contain .class files and is passed as an argument to the recDelete () method when it is invoked. What is the result?

The method deletes all the .class files in the Projects directory and its subdirectories.
The method deletes the .class files of the Projects directory only.
The method executes and does not make any changes to the Projects directory.
The method throws an IOException.

Answer(s): A

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QUESTION: 14

Given the code fragments:
4. void doStuff() throws ArithmeticException, NumberFormatException, Exception {
5. if (Math.random() >-1 throw new Exception (“Try again”);
6. }

and

24. try {
25. doStuff ( ):
26. } catch (ArithmeticException | NumberFormatException | Exception e) {
27. System.out.println (e.getMessage()); }
28. catch (Exception e) {
29. System.out.println (e.getMessage()); }
30. }

Which modification enables the code to print Try again?

Comment the lines 28, 29 and 30.
Replace line 26 with:
} catch (Exception | ArithmeticException | NumberFormatException e) {
Replace line 26 with:
} catch (ArithmeticException | NumberFormatException e) {
Replace line 27 with:
throw e;

Answer(s): C

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QUESTION: 15

Given the definition of the Country class:

public class country {
public enum Continent {ASIA, EUROPE}
String name;
Continent region;

public Country (String na, Continent reg) {
name = na, region = reg;
}
public String getName () {return name;}
public Continent getRegion () {return region;}
}

and the code fragment:

List<Country> couList = Arrays.asList (
new Country (“Japan”, Country.Continent.ASIA),
new Country (“Italy”, Country.Continent.EUROPE),
new Country (“Germany”, Country.Continent.EUROPE));
Map<Country.Continent, List<String>> regionNames = couList.stream ()
.collect(Collectors.groupingBy (Country ::getRegion,
Collectors.mapping(Country::getName, Collectors.toList()))));
System.out.println(regionNames);

{EUROPE = [Italy, Germany], ASIA = [Japan]}
{ASIA = [Japan], EUROPE = [Italy, Germany]}
{EUROPE = [Germany, Italy], ASIA = [Japan]}
{EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}

Answer(s): B

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Oracle 1Z0-809 Exam (page: 3) Oracle Java SE 8 Programmer II Updated on: 29-Aug-2025

QUESTION: 11

QUESTION: 12

QUESTION: 13

QUESTION: 14

QUESTION: 15

Oracle 1Z0-809 Exam (page: 3)
Oracle Java SE 8 Programmer II
Updated on: 29-Aug-2025