Oracle 1Z0-809 Online Practice Questions and Exam Preparation

Oracle 1Z0-809 Online Questions & Answers

• Question 131:

  Given the code fragment:

  Path path1 = Paths.get("/app/./sys/");

  Path res1 = path1.resolve("log");

  Path path2 = Paths.get("/server/exe/");

  Path res1 = path1.resolve("/readme/");

  System.out.println(res1);

  System.out.println(res2);

  What is the result?

  A. /app/sys/log /readme/server/exe
  B. /app/log/sys /server/exe/readme
  C. /app/./sys/log /readme
  D. /app/./sys/log /server/exe/readme
  C. /app/./sys/log /readme

• Question 132:

  Given the information: Emp table has 10 records. Given the code fragment:

  

  Which code fragment, inserted at Line n1, helps you determine the number of records in ResultSet?

  A. ResultSetMetaData rsmd = rs.getMetaData(); int totRows = rsmd.getRowCount();
  B. int totRows=0; while(rs.next()){ totRows++; }
  C. rs.last(); int totRows = rs.getRowCount();
  D. rs.last(); int totRows = rs.getRowId(1);
  A. ResultSetMetaData rsmd = rs.getMetaData(); int totRows = rsmd.getRowCount();

• Question 133:

  Which two statements are true about synchronization and locks? (Choose two.)

  A. A thread automatically acquires the intrinsic lock on a synchronized statement when executed.
  B. The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an uncaught exception.
  C. A thread exclusively owns the intrinsic lock of an object between the time it acquires the lock and the time it releases it.
  D. A thread automatically acquires the intrinsic lock on a synchronized method's object when entering that method.
  E. Threads cannot acquire intrinsic locks on classes.
  A. A thread automatically acquires the intrinsic lock on a synchronized statement when executed.
  B. The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an uncaught exception.

• Question 134:

  Given the code fragment:

  

  Which is the valid definition of the Course enum?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  D. Option D

• Question 135:

  Given the code fragment:

  

  You have been asked to define the ProductCode class. The definition of the ProductCode class must allow c1 instantiation to succeed and cause a compilation error on c2 instantiation. Which definition of ProductCode meets the requirement?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  B. Option B

• Question 136:

  Given the code fragments:

  interface CourseFilter extends Predicate {

  public default boolean test (String str) {

  return str.equals ("Java");

  }

  }

  and

  List strs = Arrays.asList("Java", "Java EE", "Java ME");

  Predicate cf1 = s - > s.length() > 3;

  Predicate cf2 = new CourseFilter() { //line n1

  public boolean test (String s) {

  return s.contains ("Java");

  }

  };

  long c = strs.stream()

  .filter(cf1)

  .filter(cf2 //line n2

  .count();

  System.out.println(c);

  What is the result?

  A. 2
  B. 3
  C. A compilation error occurs at line n1.
  D. A compilation error occurs at line n2.
  B. 3

• Question 137:

  Which class definition compiles?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  B. Option B

• Question 138:

  Given the code fragment:

  BiFunction val = (t1, t2) -> t1 + t2; //line n1

  System.out.println(val.apply(10, 10.5));

  What is the result?

  A. 20
  B. 20.5
  C. A compilation error occurs at line n1.
  D. A compilation error occurs at line n2.
  C. A compilation error occurs at line n1.

• Question 139:

  Given:

  Book.java:

  public class Book {

  private String read(String bname) { return "Read" + bname }

  }

  EBook.java:

  public class EBook extends Book {

  public class String read (String url) { return "View" + url }

  }

  Test.java:

  public class Test {

  public static void main (String[] args) {

  Book b1 = new Book();

  b1.read("Java Programing");

  Book b2 = new EBook();

  b2.read("http://ebook.com/ebook");

  }

  }

  What is the result?

  A. Read Java Programming View http:/ ebook.com/ebook
  B. Read Java Programming Read http:/ ebook.com/ebook
  C. The EBook.java file fails to compile.
  D. The Test.java file fails to compile.
  D. The Test.java file fails to compile.

• Question 140:

  Given the code fragment:

  List str = Arrays.asList ("my", "pen", "is", "your', "pen");

  Predicate test = s -> {

  int i = 0;

  boolean result = s.contains ("pen");

  System.out.print(i++) + ":");

  return result;

  };

  str.stream()

  .filter(test)

  .findFirst()

  .ifPresent(System.out ::print);

  What is the result?

  A. 0 : 0 : pen
  B. 0 : 1 : pen
  C. 0 : 0 : 0 : 0 : 0 : pen
  D. 0 : 1 : 2 : 3 : 4 :
  E. A compilation error occurs.
  A. 0 : 0 : pen