26 January, 2022

Latest 1Z0-809 Preparation Labs For Java SE 8 Programmer II Certification

We provide real 1Z0-809 exam questions and answers braindumps in two formats. Download PDF & Practice Tests. Pass Oracle 1Z0-809 Exam quickly & easily. The 1Z0-809 PDF type is available for reading and printing. You can print more and practice many times. With the help of our Oracle 1Z0-809 dumps pdf and vce product and material, you can easily pass the 1Z0-809 exam.

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Total 164 questions Full Exam Access

Question 1

Given:

What is the result?

Hi Interface-2

A compilation error occurs.

Hi Interface-1

Hi MyClass

Question 2

Given the code fragment:
1Z0-809 dumps exhibit

What is the result?

A compilation error occurs at line n1.

courseJava

Javacourse

A compilation error occurs at line n2.

Question 3

Which two reasons should you use interfaces instead of abstract classes? (Choose two.)

You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.

You expect that unrelated classes would implement your interfaces.

You want to share code among several closely related classes.

You want to declare non-static on non-final fields.

You want to take advantage of multiple inheritance of type.

Question 4

Given the code fragment:
List nums = Arrays.asList (10, 20, 8): System.out.println (
//line n1
);
Which code fragment must be inserted at line n1 to enable the code to print the maximum number in the nums list?

nums.stream().max(Comparator.comparing(a -> a)).get()

nums.stream().max(Integer : : max).get()

nums.stream().max()

nums.stream().map(a -> a).max()

Question 5

Given the code fragment:
public class FileThread implements Runnable { String fName;
public FileThread(String fName) { this.fName = fName; } public void run () System.out.println(fName);}
public static void main (String[] args) throws IOException, InterruptedException {
ExecutorService executor = Executors.newCachedThreadPool(); Stream listOfFiles = Files.walk(Paths.get(“Java Projects”)); listOfFiles.forEach(line -> {
executor.execute(new FileThread(line.getFileName().toString ())); //
line n1
});
executor.shutdown(); executor.awaitTermination(5, TimeUnit.DAYS); // line n2
}
}
The Java Projects directory exists and contains a list of files. What is the result?

The program throws a runtime exception at line n2.

The program prints files names concurrently.

The program prints files names sequentially.

A compilation error occurs at line n1.

Question 6

Given the code fragment: UnaryOperator uo1 = s -> s*2; line n1
List loanValues = Arrays.asList(1000.0, 2000.0); loanValues.stream()
.filter(lv -> lv >= 1500)
.map(lv -> uo1.apply(lv))
.forEach(s -> System.out.print(s + “ “)); What is the result?

4000.0

4000

A compilation error occurs at line n1.

A compilation error occurs at line n2.

Question 7

Given:
final class Folder { //line n1
//line n2
public void open () { System.out.print(“Open”);
}
}
public class Test {
public static void main (String [] args) throws Exception { try (Folder f = new Folder()) {

f.open();}}}Which two modifications enable the code to print Open Close? (Choose two.)

Replace line n1 with:class Folder implements AutoCloseable {

Replace line n1 with:class Folder extends Closeable {

Replace line n1 with:class Folder extends Exception {

At line n2, insert: final void close () {System.out.print(“Close”);}

At line n2, insert:public void close () throws IOException { System.out.print(“Close”);}

Question 8

Given the code fragment: public class Foo {
public static void main (String [ ] args) {
Map unsortMap = new HashMap< > ( ); unsortMap.put (10, “z”);
unsortMap.put (5, “b”);
unsortMap.put (1, “d”);
unsortMap.put (7, “e”);
unsortMap.put (50, “j”);
Map treeMap = new TreeMap (new Comparator ( ) {
@Override public int compare (Integer o1, Integer o2) {return o2.compareTo
(o1); } } );
treeMap.putAll (unsortMap);
for (Map.Entry entry : treeMap.entrySet () ) { System.out.print (entry.getValue () + “ “);
}
}
}
What is the result?

A compilation error occurs.

d b e z j

j z e b d

z b d e j

Question 9

Which two are elements of a singleton class? (Choose two.)

a transient reference to point to the single instance

a public method to instantiate the single instance

a public static method to return a copy of the singleton reference

a private constructor to the class

a public reference to point to the single instance

Question 10

Assume customers.txt is accessible and contains multiple lines. Which code fragment prints the contents of the customers.txt file?

Stream<String> stream = Files.find (Paths.get (“customers.txt”)); stream.forEach((String c) -> System.out.println(c));

Stream<Path> stream = Files.find (Paths.get (“customers.txt”)); stream.forEach( c) -> System.out.println(c));

Stream<Path> stream = Files.list (Paths.get (“customers.txt”)); stream.forEach( c) -> System.out.println(c));

Stream<String> lines = Files.lines (Paths.get (“customers.txt”)); lines.forEach( c) -> System.out.println(c));

Question 11

Given the code fragment:
BiFunction val = (t1, t2) -> t1 + t2; //line n1 System.out.println(val.apply(10, 10.5));
What is the result?

20.5

A compilation error occurs at line n1.

A compilation error occurs at line n2.

Question 12

Given that course.txt is accessible and contains:
Course : : Java
and given the code fragment:
public static void main (String[ ] args) { int i;
char c;
try (FileInputStream fis = new FileInputStream (“course.txt”); InputStreamReader isr = new InputStreamReader(fis);) { while (isr.ready()) { //line n1
isr.skip(2);
i = isr.read (); c = (char) i;
System.out.print(c);
}
} catch (Exception e) { e.printStackTrace();
}
}
What is the result?

ur :: va

ueJa

The program prints nothing.

A compilation error occurs at line n1.

Question 13

Given the code fragments: class Employee { Optional

address;
Employee (Optional

address) { this.address = address;
}
public Optional

getAddress() { return address; }
}
class Address {
String city = “New York”;
public String getCity { return city: } public String toString() {
return city;
}
}
and
Address address = null;
Optional

addrs1 = Optional.ofNullable (address);
Employee e1 = new Employee (addrs1);
String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : “City Not available”;
What is the result?

New York

City Not available

null

A NoSuchElementException is thrown at run time.

Question 14

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));

Question 15

Given:

and the code fragment:
1Z0-809 dumps exhibit

What is the result?

A compilation error occurs at line n2.

A compilation error occurs because the try block doesn’t have a catch or finally block.

A compilation error occurs at line n1.

The program compiles successfully.

Question 16

Given the code fragment:
Path source = Paths.get (“/data/december/log.txt”); Path destination = Paths.get(“/data”);
Files.copy (source, destination);
and assuming that the file /data/december/log.txt is accessible and contains: 10-Dec-2014 – Executed successfully
What is the result?

A file with the name log.txt is created in the /data directory and the content of the /data/december/ log.txt file is copied to it.

The program executes successfully and does NOT change the file system.

A FileNotFoundException is thrown at run time.

A FileAlreadyExistsException is thrown at run time.

Question 17

Given:
public class Emp { String fName; String lName;
public Emp (String fn, String ln) { fName = fn;
lName = ln;
}
public String getfName() { return fName; } public String getlName() { return lName; }
}
and the code fragment: List emp = Arrays.asList ( new Emp (“John”, “Smith”),
new Emp (“Peter”, “Sam”),
new Emp (“Thomas”, “Wale”)); emp.stream()
//line n1
.collect(Collectors.toList());
Which code fragment, when inserted at line n1, sorts the employees list in descending order of fName and then ascending order of lName?

.sorted (Comparator.comparing(Emp::getfName).reserved().thenComparing(Emp::getlName))

.sorted (Comparator.comparing(Emp::getfName).thenComparing(Emp::getlName))

.map(Emp::getfName).sorted(Comparator.reserveOrder())

.map(Emp::getfName).sorted(Comparator.reserveOrder().map (Emp::getlName).reserved

Question 18

Given:

and the code fragment:
1Z0-809 dumps exhibit

What is the result?

0.0

1500.0

A compilation error occur

2000.0

Question 19

Given the code fragment:
Path path1 = Paths.get(“/app/./sys/”); Path res1 = path1.resolve(“log”);
Path path2 = Paths.get(“/server/exe/”); Path res1 = path1.resolve(“/readme/”); System.out.println(res1); System.out.println(res2);
What is the result?

/app/sys/log/readme/server/exe

/app/log/sys/server/exe/readme

/app/./sys/log/readme

/app/./sys/log/server/exe/readme

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Total 164 questions Full Exam Access