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1Z0-810 (Upgrade Java SE 7 to SE 8 OCP) sample exam questions by Oracle

1Z0-810 sample exam questions
Written by Mushfiq Mammadov

1. Given the code fragment:

public class App {
    void calcBill() {
        // Line n1
        new Invoice().print();
    }
}

Which code fragment can be inserted at Line n1 to enable the class compile?

A) private class Invoice {
      void print() { System.out.println("Invoice Printed"); }
  }

B) public class Invoice {
      void print() { System.out.println("Invoice Printed"); }
  }

C) class Invoice {
      void print() { System.out.println("Invoice Printed"); }
  }

D) protected class Invoice {
      void print() { System.out.println("Invoice Printed"); }
  }

 

2. Given:

public interface MyInt {
    public void method1() {
        System.out.println("method1");
    }
    public default void method2() {
        System.out.println("method2");
    }
    public static void method3() {
        System.out.println("method3");
    }
    public abstract void method4();
}

Which statement is true?

A) Only method4() compiles
B) Only method2() and method4() compiles.
C) Only method2(), method3(), and method4() compiles.
D) MyInt.java compiles.

 

3. Given the code fragment:

public static void main(String[] args) {
    List<String> courses = Arrays.asList("Java", "Oracle", "JSF", "EJB");
    // Line n1
    System.out.println(count);
}

Which code fragment can be inserted at Line n1 to enable the code to print 2?

A) int count = courses.stream().filter(s -> s.startsWith("J")).count();
B) long count = courses.stream().filter(s -> s.startsWith("J")).count();
C) int count = courses.filter(s -> s.startsWith("J")).stream().count();
D) long count = courses.filter(s -> s.startsWith("J")).stream().count();

 

4. Given the code fragment:

public class App {
    public static void main(String[] args) {
        String[] fruits = {"banana", "apple", "pears", "grapes"};
        Arrays.sort(fruits, (a, b) -> a.compareTo(b));
        for (String s : fruits) {
            System.out.print(" " + s);
        }
    }
}

What is the result?

A) apple banana grapes pears
B) pears grapes banana apple
C) banana apple pears grapes
D) Compilation fails.

 

5. 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.

 

6. Given that /report/jun.txt and report/data/jundata.txt files are accessible and given the code fragment:

public static void main(String[] args) {
    try (Stream<Path> st1 = Files.find(Paths.get("/report"), 2, (p, a) ->
        p.toString().endsWith("txt"));
        Stream<Path> st2 = Files.walk(Paths.get("/report"), 2); ) {
            st1.forEach(s -> System.out.println("Found: " + s));
            st2.filter(s -> s.toString()
                .endsWith("txt"))
                .forEach(s -> System.out.println("Walked: " + s));
        } catch (IOException ioe) {
            System.out.println("Exception");
        }
}

What is the result?

A) Found: \result\data\jundata.txt
   Found: \result\jun.txt
   Walked: \result\data\jundata.txt
   Walked: \result\jun.txt

B) Found: \result\data\jundata.txt
   Found: \result\jun.txt
   Walked: \result\data\jundata.txt
   Walked: \result
   Walked: \result\jun.txt
   Walked: \result\data\

C) Found: \result\jun.txt
   Walked: \result\data\jundata.txt
   Walked: \result\jun.txt

D) Found: \result\jun.txt
   Walked: \result
   Walked: \result\jun.txt
   Walked: \result\data\
   Walked: \result\data\jundata.txt

 

7. Given the code fragment:

public static void main(String[] args) {
    Stream<Integer> nums = Stream.of(1, 2, 3, 4, 5);
    nums.filter(n -> n % 2 == 1);
    nums.forEach(p -> System.out.print(p));
}

What is the result?

A) 135
B) 12345
C) Compilation fails.
D) An exception is thrown at runtime.

 

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

 

Source: Oracle, Exam 810: Upgrade Java SE 7 to Java SE 8 OCP

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Mushfiq Mammadov

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