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Q21. Given:
What is the result?
A. Good Day! Good Luck!
B. Good Day! Good Day!
C. Good Luck! Good Day!
D. Good Luck! Good Luck!
E. Compilation fails
Answer: E
Q22. Given the code fragment:
public static void main (String[] args) throws IOException {
BufferedReader brCopy = null;
try (BufferedReader br = new BufferedReader (new FileReader(“employee.txt”))) { //
line n1
br.lines().forEach(c -> System.out.println(c));
brCopy = br;//line n2
}
brCopy.ready(); //line n3;
}
Assume that the ready method of the BufferedReader, when called on a closed BufferedReader, throws an exception, and employee.txt is accessible and contains valid text.
What is the result?
A. A compilation error occurs at line n3.
B. A compilation error occurs at line n1.
C. A compilation error occurs at line n2.
D. The code prints the content of the employee.txt file and throws an exception at line n3.
Answer: B
Q23. 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);
What is the output?
A. {EUROPE = [Italy, Germany], ASIA = [Japan]}
B. {ASIA = [Japan], EUROPE = [Italy, Germany]}
C. {EUROPE = [Germany, Italy], ASIA = [Japan]}
D. {EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}
Answer: A
Q24. Given the code fragment:
Path p1 = Paths.get(“/Pics/MyPic.jpeg”); System.out.println (p1.getNameCount() + “:” + p1.getName(1) + “:” + p1.getFileName());
Assume that the Pics directory does NOT exist. What is the result?
A. An exception is thrown at run time.
B. 2:MyPic.jpeg: MyPic.jpeg
C. 1:Pics:/Pics/ MyPic.jpeg
D. 2:Pics: MyPic.jpeg
Answer: C
Q25. Given: What is the result?
A. Initialized Started
B. Initialized Started Initialized
C. Compilation fails
D. An exception is thrown at runtime
Answer: B
Q26. Given:
class FuelNotAvailException extends Exception { }
class Vehicle {
void ride() throws FuelNotAvailException {//line n1
System.out.println(“Happy Journey!”);
}
}
class SolarVehicle extends Vehicle {
public void ride () throws Exception {//line n2
super ride ();
}
}
and the code fragment:
public static void main (String[] args) throws FuelNotAvailException, Exception {
Vehicle v = new SolarVehicle ();
v.ride();
}
Which modification enables the code fragment to print Happy Journey!?
A. Replace line n1 with public void ride() throws FuelNotAvailException {
B. Replace line n1 with protected void ride() throws Exception {
C. Replace line n2 with void ride() throws Exception {
D. Replace line n2 with private void ride() throws FuelNotAvailException {
Answer: B
Q27. Which two code blocks correctly initialize a Locale variable?
A. Locale loc1 = “UK”;
B. Locale loc2 = Locale.getInstance(“ru”);
C. Locale loc3 = Locale.getLocaleFactory(“RU”);
D. Locale loc4 = Locale.UK;
E. Locale loc5 = new Locale (“ru”, “RU”);
Answer: D,E
Q28. Given:
class Bird {
public void fly () { System.out.print(“Can fly”); }
}
class Penguin extends Bird {
public void fly () { System.out.print(“Cannot fly”); }
}
and the code fragment:
class Birdie {
public static void main (String [ ] args) {
fly( ( ) -> new Bird ( ));
fly (Penguin : : new);
}
/* line n1 */
}
Which code fragment, when inserted at line n1, enables the Birdie class to compile?
A. static void fly (Consumer<Bird> bird) {
bird :: fly (); }
B. static void fly (Consumer<? extends Bird> bird) {
bird.accept( ) fly ();
}
C. static void fly (Supplier<Bird> bird) {
bird.get( ) fly ();
}
D. static void fly (Supplier<? extends Bird> bird) {
LOST
Answer: C
Explanation: NOTE: Very confusing question. There is no logic in the options.
Q29. Given:
public class product { int id; int price;
public Product (int id, int price) {
this.id = id;
this.price = price;
}
public String toString() { return id + “:” + price; }
}
and the code fragment:
List<Product> products = Arrays.asList(new Product(1, 10),
new Product (2, 30),
new Product (2, 30));
Product p = products.stream().reduce(new Product (4, 0), (p1, p2) -> {
p1.price+=p2.price;
return new Product (p1.id, p1.price);});
products.add(p);
products.stream().parallel()
.reduce((p1, p2) - > p1.price > p2.price ? p1 : p2)
.ifPresent(System.out: :println);
What is the result?
A. 2 : 30
B. 4 : 0
C. 4 : 60
D. 4 : 60
2 : 30
3 : 20
1 : 10
E.
The program prints nothing.
Answer: D
Q30. Given the code fragment:
List<Integer> 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?
A. nums.stream().max(Comparator.comparing(a -> a)).get()
B. nums.stream().max(Integer : : max).get()
C. nums.stream().max()
D. nums.stream().map(a -> a).max()
Answer: C