1Z0-809 Free Practice Test

Given the code fragment:
<>

1. A. Function<Integer> funRef = e –> e + 10; Integer result = funRef.apply(value);
2. B. IntFunction funRef = e –> e + 10; Integer result = funRef.apply (10);
3. C. ToIntFunction funRef = e –> e + 10;int result = funRef.applyAsInt (value);
4. D. ToIntFunction funRef = e –> e + 10; int result = funRef.apply (value);

Correct Answer: A

Given the code fragments:
< ><>>< ><>

1. A. null
2. B. A compilation error occurs.
3. C. DogCatMouse
4. D. [Dog, Cat, Mouse]

Correct Answer: D

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?

1. A. The program prints employee IDs.
2. B. The program prints customer IDs.
3. C. The program prints Error.
4. D. compilation fails on line 13.

Correct Answer: C

Which statement is true about the single abstract method of the java.util.function.Function interface?

1. A. It accepts one argument and returns void.
2. B. It accepts one argument and returns boolean.
3. C. It accepts one argument and always produces a result of the same type as the argument.
4. D. It accepts an argument and produces a result of any data type.

Correct Answer: D

Given the code fragments:
class Caller implements Callable { String str;
public Caller (String s) {this.str=s;}
public String call()throws Exception { return str.concat (“Caller”);}
}
class Runner implements Runnable { String str;
public Runner (String s) {this.str=s;}
public void run () { System.out.println (str.concat (“Runner”));}
}
and
public static void main (String[] args) InterruptedException, ExecutionException
{
ExecutorService es = Executors.newFixedThreadPool(2); Future f1 = es.submit (new Caller (“Call”));
Future f2 = es.submit (new Runner (“Run”)); String str1 = (String) f1.get();
String str2 = (String) f2.get(); //line n1 System.out.println(str1+ “:” + str2);
}
What is the result?

1. A. The program prints: Run RunnerCall Caller : nullAnd the program does not terminate.
2. B. The program terminates after printing: Run RunnerCall Caller : Run
3. C. A compilation error occurs at line n1.
4. D. An Execution is thrown at run time.

Correct Answer: A