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Oracle Java SE 8 Programmer II Sample Questions (Q138-Q143):

NEW QUESTION # 138
Given the code fragments:
class Employee {
Optional<Address> address;
Employee (Optional<Address> address) {
this.address = address;
}
public Optional<Address> getAddress() { return address; }
}
class Address {
String city = "New York";
public String getCity { return city: }
public String toString() {
return city;
}
}
and
Address address = null;
Optional<Address> addrs1 = Optional.ofNullable (address);
Employee e1 = new Employee (addrs1);
String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : "City Not
available";
What is the result?

A. New York
B. City Not available
C. A NoSuchElementException is thrown at run time.
D. null

Answer: D

NEW QUESTION # 139
Given:
class Book {
int id;
String name;
public Book (int id, String name) {
this.id = id;
this.name = name;
}
public boolean equals (Object obj) { //line n1
boolean output = false;
Book b = (Book) obj;
if (this.name.equals(b name))}
output = true;
}
return output;
}
}
and the code fragment:
Book b1 = new Book (101, "Java Programing");
Book b2 = new Book (102, "Java Programing");
System.out.println (b1.equals(b2)); //line n2
Which statement is true?

A. The program prints false.
B. A compilation error occurs. To ensure successful compilation, replace line n1with:
boolean equals (Book obj) {
C. The program prints true.
D. A compilation error occurs. To ensure successful compilation, replace line n2with:
System.out.println (b1.equals((Object) b2));

Answer: C

Explanation:
Explanation

NEW QUESTION # 140
Given the code fragments:
public class Book implements Comparator<Book> {
String name;
double price;
public Book () {}
public Book(String name, double price) {
this.name = name;
this.price = price;
}
public int compare(Book b1, Book b2) {
return b1.name.compareTo(b2.name);
}
public String toString() {
return name + ":" + price;
}
}
and
List<Book>books = Arrays.asList (new Book ("Beginning with Java", 2), new book ( "A
Guide to Java Tour", 3));
Collections.sort(books, new Book());
System.out.print(books);
What is the result?

A. An Exceptionis thrown at run time.
B. A compilation error occurs because the Book class does not override the abstract method compareTo ().
C. [A Guide to Java Tour:3, Beginning with Java:2]
D. [Beginning with Java:2, A Guide to Java Tour:3]

Answer: C

NEW QUESTION # 141
Given:
class Vehicle implements Comparable<Vehicle>{
int vno;
String name;
public Vehicle (int vno, String name) {
this.vno = vno,;
this.name = name;
}
public String toString () {
return vno + ":" + name;
}
public int compareTo(Vehicle o) {
return this.name.compareTo(o.name);
}
and this code fragment:
Set<Vehicle> vehicles = new TreeSet <> ();
vehicles.add(new Vehicle (10123, "Ford"));
vehicles.add(new Vehicle (10124, "BMW"));
System.out.println(vehicles);
What is the result?

A. [10124:BMW, 10123:Ford]
B. A compilation error occurs.
C. A ClassCastException is thrown at run time.
D. [10123:Ford, 10124:BMW]

Answer: D

NEW QUESTION # 142
Given the code fragment:
List<Integer> list1 = Arrays.asList(10, 20);
List<Integer> list2 = Arrays.asList(15, 30);
//line n1
Which code fragment, when inserted at line n1, prints 10 20 15 30?

A. Stream.of(list1, list2).flatMapToInt(list -> list.stream()).forEach(s -> System.out.print(s + " "));
B. Stream.of(list1, list2).flatMap(list -> list.intStream()).forEach(s -> System.out.print(s + " "));
C. list1.stream().flatMap(list2.stream().flatMap(e1 -> e1.stream()).forEach(s -> System.out.println(s + "
"));
D. Stream.of(list1, list2).flatMap(list -> list.stream()).forEach(s -> System.out.print(s + " "));

Answer: D

NEW QUESTION # 143
......

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Oracle Java SE 8 Programmer II Sample Questions (Q138-Q143):

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