Sample Questions: Java Test

 Please read all the questions and select the correct option in the form below. 

 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 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();


 3. Given the code fragment:

    public static void main(String[] args) {
      List 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 st1 = Files.find(Paths.get("/report"), 2, (p, a) ->
      p.toString().endsWith("txt"));
      Stream 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: \report\data\jundata.txt
       Found: \report\jun.txt
       Walked: \report\data\jundata.txt
       Walked: \report\jun.txt
    B) Found: \report\data\jundata.txt
       Found: \report\jun.txt
       Walked: \report\data\jundata.txt
       Walked: \report
       Walked: \report\jun.txt
       Walked: \report\data\
    C) Found: \report\jun.txt
       Walked: \report\data\jundata.txt
       Walked: \report\jun.txt
    D) Found: \report\jun.txt
       Walked: \report
       Walked: \report\jun.txt
       Walked: \report\data\
       Walked: \report\data\jundata.txt


 7. Given the code fragment:

    public static void main(String[] args) {
      Stream 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.

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