Question # 1
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)
.flatMap(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)
.flatMapToInt(list -> list.stream())
.forEach(s -> System.out.print(s + “ “)); |
C. list1.stream()
.flatMap(list2.stream().flatMap(e1 -> e1.stream())
.forEach(s -> System.out.println(s + “ “));
Question # 2
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 –ea option?
| | A. -10
| | B. 0
| | C. An AssertionError is thrown.
| | D. A compilation error occurs. |
Question # 3
Given the code fragment:
9. Connection conn = DriveManager.getConnection(dbURL, userName, passWord);
10. String query = “SELECT id FROM Employee”;
11. try (Statement stmt = conn.createStatement()) {
12. ResultSet rs = stmt.executeQuery(query);
13.stmt.executeQuery(“SELECT id FROM Customer”);
14. while (rs.next()) {
15. //process the results
16.System.out.println(“Employee ID: “+ rs.getInt(“id”));
17.}
18. } catch (Exception e) {
19. System.out.println (“Error”);
20. }
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists.
The Employee and Customer tables are available and each table has id column with a few
records and the SQL queries are valid.
What is the result of compiling and executing this code fragment?
| | A. The program prints employee IDs.
| | B. The program prints customer IDs.
| | C. The program prints Error.
| | D. compilation fails on line 13. |
D. compilation fails on line 13.
Question # 4
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. |
D. 4 : 60
2 : 30
3 : 20
1 : 10
Question # 5
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?
| | A. ur :: va
| | B. ueJa
| | C. The program prints nothing.
| | D. A compilation error occurs at line n1. |
Question # 6
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?
| | A. {1007 = A, 1002 = C, 1001 = B, 1003 = B}
| | B. {1001 = B, 1002 = C, 1003 = B, 1007 = A}
| | C. {1002 = C, 1003 = B, 1007 = A}
| | D. {1007 = A, 1001 = B, 1003 = B, 1002 = C} |
D. {1007 = A, 1001 = B, 1003 = B, 1002 = C}
Question # 7
Given:
What is the result?
| | A. Null
| | B. Compilation fails
| | C. An exception is thrown at runtime
| | D. 0 |
C. An exception is thrown at runtime
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