Download Oracle.1z0-809.PracticeTest.2018-04-09.61q.tqb
| Vendor: | Oracle |
| Exam Code: | 1z0-809 |
| Exam Name: | Java SE 8 Programmer II |
| Date: | Apr 09, 2018 |
| File Size: | 413 KB |
Demo Questions
Question 1
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]}
Correct answer: A
Question 2
Given the code fragment:
Map<Integer, String> books = new TreeMap<>();
books.put (1007, “A”);
books.put (1002, “C”);
books.put (1001, “B”);
books.put (1003, “B”);
System.out.println (books);
What is the result?
- {1007 = A, 1002 = C, 1001 = B, 1003 = B}
- {1001 = B, 1002 = C, 1003 = B, 1007 = A}
- {1002 = C, 1003 = B, 1007 = A}
- {1007 = A, 1001 = B, 1003 = B, 1002 = C}
Correct answer: D
Question 3
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?
- The program prints true.
- The program prints false.
- A compilation error occurs. To ensure successful compilation, replace line n1 with:boolean equals (Book obj) {
- A compilation error occurs. To ensure successful compilation, replace line n2 with:System.out.println (b1.equals((Object) b2));
Correct answer: C
