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1Z0-813 (Upgrade to Java SE 8 OCP) sample exam questions by Oracle

1Z0-813 sample exam questions
Written by Mushfiq Mammadov

1. Which code fragment correctly assign a numeric literal?

A) byte b1 = b1011;
B) byte b2 = 1011b;
C) byte b3 = 0b1001;
D) byte b4 = 0xb001;

 

2. Given the fragment:

public class MathFun {
    public static void main(String[] args) {
        int number1 = 0b0111;
        int number2 = 0111_000;
        System.out.println("Number1: " + number1);
        System.out.println("Number2: " + number1);
    }
}

What is the result?

A) Number1: 7
  Number2: 7

B) Number1: 7
  Number2: 111_000

C) Number1: 0b0111
  Number2: 0111000

D) Compilation fails.

 

3. Given:

The test1.txt file is available and the test2.txt file is not available.
And, given the code fragment:

Path sPath = Paths.get("test1.txt");
Path dPath = Paths.get("test2.txt");
try {
    Files.move(sPath, dPath, StandardCopyOption.ATOMIC_MOVE);
} catch (IOException ex) {
    System.err.println("Exception!");
}

Which statement is true?

A) The test1.txt file is renamed to the test2.txt file and the test1.txt file is removed in a single operation.
B) The test1.txt file is renamed to the test2.txt file and the test1.txt file is removed in two distinct operation.
C) The test1.txt file is copied and renamed to the test2.txt file in a single operation.
D) The program prints: Exception!

 

4. Which is a valid functional interface?

A) public interface Useful<E> {
      E getStuff();
      void putStuff(E e);
  }

B) public interface Useful {
      void doStuff();
      default void doOtherStuff() {}
  }

C) @FunctionalInterface
   public interface Useful{ default void doStuff(){} }

D) public interface Useful {
      abstract void doStuff();
      abstract void doCalc();
  }

 

5. Given the code fragment:

public class App {
    public static void main(String[] args) {
        String s = "Java";
        String n = "SE";
        // Line n1
        System.out.println(sf.apply(s, n));
    }
}

Which code fragment, when inserted at Line n1, prints JavaSE?

A) BiFunction<String, String, String> sf = (s1, n1) -> s1.concat(n1);
B) BiFunction<String, String> sf = (s1, n1) -> s1.concat(n1);
C) Function<String, String> sf = (s1, n1) -> s1.concat(n1);
D) Function<String, String, String> sf = (s1, n1) -> s1.concat(n1);

 

6. Given the code fragment:

Arrays.asList("Fred", "Jim", "Sheila")
    .stream()
    .peek(System.out::println)
    .allMatch(s -> s.startsWith("F"));

What is the result?

A) Fred
  Jim
  Sheila

B) Fred
  Jim

C) Fred
D) Compilation fails.

 

7. Given the code fragment:

LocalDate date1 = LocalDate.of(2016, Month.JANUARY, 1);
LocalDateTime date2 = LocalDateTime.of(2017, Month.JUNE, 1, 1, 1);
Period p = Period.between(date1, date2);
System.out.print(p.getYears() + ":" + p.getMonths() + ":" + p.getDays());

What is the result?

A) 1:5:0
B) 1:6:0
C) 0:0:0
D) Compilation fails.

 

8. Given the code fragment:

class MyResource1 implements Closeable {
    public void close() {
        System.out.print("r1 ");
    }
}

class MyResource2 implements AutoCloseable {
    public void close() throws IOException {
        System.out.print("r2 ");
        throw new IOException();
    }
}

public class App2 {
    public static void main(String[] args) {
        try (MyResource1 r1 = new MyResource1();
              MyResource2 r2 = new MyResource2();) {
            System.out.print("try ");
        } catch (Exception e) {
            System.out.print("catch ");
            for (Throwable t : e.getSuppressed()) {
                System.out.println(t.getClass().getName());
            }
        }
    }
}

What is the result?

A) try r2 r1 catch java.io.IOException
B) try r2 r1 catch
C) try r1 r2 catch
D) Compilation fails.

 

Answers:

1. C
2. A
3. A
4. B
5. A
6. B
7. D
8. B

 

Source: Oracle, Exam 813: Upgrade to Java SE 8 OCP

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Mushfiq Mammadov

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