1Z0-809 Online Practice Questions and Answers

Given:

IntStream stream = IntStream.of (1,2,3);

IntFunction inFu= x -> y -> x*y; //line n1

IntStream newStream = stream.map(inFu.apply(10)); //line n2

newStream.forEach(System.output::print);

Which modification enables the code fragment to compile?

A. Replace line n1 with: IntFunction inFu = x -> y -> x*y;

B. Replace line n1 with: IntFunction inFu = x -> y -> x*y;

C. Replace line n1 with: BiFunction inFu = x -> y -> x*y;

D. Replace line n2 with: IntStream newStream = stream.map(inFu.applyAsInt (10));

Given:

class ImageScanner implements AutoCloseable {

public void close () throws Exception {

System.out.print ("Scanner closed.");

}

public void scanImage () throws Exception {

System.out.print ("Scan.");

throw new Exception("Unable to scan.");

}

}

class ImagePrinter implements AutoCloseable {

public void close () throws Exception {

System.out.print ("Printer closed.");

}

public void printImage () {System.out.print("Print."); }

}

and this code fragment:

try (ImageScanner ir = new ImageScanner();

ImagePrinter iw = new ImagePrinter()) {

ir.scanImage();

iw.printImage();

} catch (Exception e) {

System.out.print(e.getMessage());

}

What is the result?

A. Scan.Printer closed. Scanner closed. Unable to scan.

B. Scan.Scanner closed. Unable to scan.

C. Scan. Unable to scan.

D. Scan. Unable to scan. Printer closed.

Given:

class Vehicle {

int vno;

String name;

public Vehicle (int vno, String name) {

this.vno = vno,;

this.name = name;

}

public String toString () {

return vno + ":" + name;

}

}

and this code fragment:

Set vehicles = new TreeSet <> ();

vehicles.add(new Vehicle (10123, "Ford"));

vehicles.add(new Vehicle (10124, "BMW"));

System.out.println(vehicles);

What is the result?

A. 10123 Ford 10124 BMW

B. 10124 BMW 10123 Ford

C. A compilation error occurs.

D. A ClassCastException is thrown at run time.

Given:

public final class IceCream {

public void prepare() {}

}

public class Cake {

public final void bake(int min, int temp) {}

public void mix() {}

}

public class Shop {

private Cake c = new Cake ();

private final double discount = 0.25;

public void makeReady () { c.bake(10, 120); }

}

public class Bread extends Cake {

public void bake(int minutes, int temperature) {}

public void addToppings() {}

}

Which statement is true?

A. A compilation error occurs in IceCream.

B. A compilation error occurs in Cake.

C. A compilation error occurs in Shop.

D. A compilation error occurs in Bread

E. All classes compile successfully.

Which statement is true about java.util.stream.Stream?

A. A stream cannot be consumed more than once.

B. The execution mode of streams can be changed during processing.

C. Streams are intended to modify the source data.

D. A parallel stream is always faster than an equivalent sequential stream.

For which three objects must a vendor provide implementations in its JDBC driver? (Choose three.)

A. Time

B. Date

C. Statement

D. ResultSet

E. Connection

F. SQLException

G. DriverManager

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?

A. 4000.0

B. 4000

C. A compilation error occurs at line n1.

D. A compilation error occurs at line n2.

Given: and the code fragment:

What is the result?

A. A compilation error occurs at line n2.

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

C. A compilation error occurs at line n1.

D. The program compiles successfully.

Given the code fragment:

What is the result?

A. A compilation error occurs at line n1.

B. A compilation error occurs at line n2.

C. The code reads the password without echoing characters on the console.

D. A compilation error occurs because the IOException isn't declared to be thrown or caught?

Given the code fragment:

What is the result?

A. Word: why what when

B. Word: why Word: why what Word: why what when

C. Word: why Word: what Word: when

D. Compilation fails at line n1.

Given the code fragment:

Which code fragment, when inserted at line 7, enables printing 100?

A. Function funRef = e –andgt; e + 10; Integer result = funRef.apply(value);

B. IntFunction funRef = e –andgt; e + 10; Integer result = funRef.apply (10);

C. ToIntFunction funRef = e –andgt; e + 10; int result = funRef.applyAsInt (value);

D. ToIntFunction funRef = e –andgt; e + 10; int result = funRef.apply (value);

Which two statements are true about the Fork/Join Framework? (Choose two.)

A. The RecursiveTask subclass is used when a task does not need to return a result.

B. The Fork/Join framework can help you take advantage of multicore hardware.

C. The Fork/Join framework implements a work-stealing algorithm.

D. The Fork/Join solution when run on multicore hardware always performs faster than standard sequential solution.

Given:

public class Counter {

public static void main (String[ ] args) {

int a = 10;

int b = -1;

assert (b >=1) : "Invalid Denominator";

int = a / b;

System.out.println (c);

}

}

What is the result of running the code with the 璬a option?

A. -10

B. 0

C. An AssertionError is thrown.

D. A compilation error occurs.

Given the code fragments:

interface CourseFilter extends Predicate { public default boolean test (String str) {

return str.contains ("Java");

}

}

and

List strs = Arrays.asList("Java", "Java EE", "Embedded Java");

Predicate cf1 = s - > s.length() > 3;

Predicate cf2 = new CourseFilter() { //line n1

public boolean test (String s) {

return s.startsWith ("Java");

}

};

long c = strs.stream()

.filter(cf1)

.filter(cf2 //line n2

.count();

System.out.println(c);

What is the result?

A. 2

B. 3

C. A compilation error occurs at line n1.

D. A compilation error occurs at line n2.

Given the code fragment:

Stream files = Files.list(Paths.get(System.getProperty("user.home"))); files.forEach (fName -> { //

line n1

try {

Path aPath = fName.toAbsolutePath(); //line n2

System.out.println(fName + ":"

+ Files.readAttributes(aPath, Basic.File.Attributes.class).creationTime

());

} catch (IOException ex) {

ex.printStackTrace();

});

What is the result?

A. All files and directories under the home directory are listed along with their attributes.

B. A compilation error occurs at line n1.

C. The files in the home directory are listed along with their attributes.

D. A compilation error occurs at line n2.