Oracle 1Z0-804 Online Practice Questions and Exam Preparation

Oracle 1Z0-804 Online Questions & Answers

• Question 41:

  Given the code fragment:

  String s = "Java 7, Java 6";

  Pattern p = Pattern.compile("Java.+\\d");

  Matcher m = p.matcher(s);

  while (m.find()) {

  System.out.println(m.group());

  }

  What is the result?

  A. Java 7
  B. Java 6
  C. Java 7, Java 6
  D. Java 7 java 6
  E. Java
  C. Java 7, Java 6

• Question 42:

  Given the code fragment:

  1.

  Thread t1 = new Thread ();

  2.

  t1.start ()

  3.

  t1.join ( );

  4.

  // . . .

  Which three are true?

  A. On line 3, the current thread stops and waits until the t1 thread finishes.
  B. On line 3, the t1 thread stops and waits until the current thread finishes.
  C. On line 4, the t1 thread is dead.
  D. On line 4, the t1 thread is waiting to run.
  E. This code cannot throw a checked exception.
  F. This code may throw a checked exception.
  A. On line 3, the current thread stops and waits until the t1 thread finishes.
  C. On line 4, the t1 thread is dead.
  F. This code may throw a checked exception.

  ---

  A, C: The join() methods waits for this thread to die.

• Question 43:

  Given:

  interface Rideable {

  String ride() ;

  }

  class Horse implements Rideable {

  String ride() { return "cantering "; }

  }

  class Icelandic extends Horse {

  String ride() { return "tolting "; }

  }

  class Test {

  public static void main(String[] args) {

  Rideable r1 = new Icelandic();

  Rideable r2 = new Horse();

  Horse h1 = new Icelandic();

  System.out.println(r1.ride() + r2.ride() + h1.ride());

  }

  }

  What is the result?

  A. tolting cantering cantering
  B. cantering cantering cantering
  C. compilation fails
  D. an exception is thrown at runtime
  A. tolting cantering cantering

• Question 44:

  Given that myFile.txt contains:

  First

  Second

  Third

  And given:

  import java.io.BufferedReader;

  import java.io.FileReader;

  import java.io.IOException;

  public class ReadFile04 {

  public static void main(String[] args) {

  try (BufferedReader buffIn =

  new BufferedReader(new FileReader("D:\\faculty\\myfile.txt"))) {

  String line = "";

  int count = 1;

  buffIn.mark(1);

  line = buffIn.readLine();

  System.out.println(count + ": " + line);

  line = buffIn.readLine();

  count++;

  System.out.println(count + ": " + line);

  buffIn.reset();

  line = buffIn.readLine();

  count++;

  System.out.println(count + ": " + line);

  } catch (IOException e) {

  System.out.println("IOException");

  }

  }

  }

  What is the result?

  A. 1: First 2: Second 3: Third
  B. 1 : First 2: Second 3: First
  C. 1: First 2: First 3: First
  D. IOExcepton
  E. Compilation fails
  B. 1 : First 2: Second 3: First

• Question 45:

  Given:

  

  What is the result?

  A. John Adams George Washington Thomas Jefferson
  B. George Washington John Adams Thomas Jefferson
  C. Thomas Jefferson John Adams George Washington
  D. An exception is thrown at runtime
  E. Compilation fails
  B. George Washington John Adams Thomas Jefferson

  ---

  The program compiles and runs fine.

  At runtime the NameList is built and then sorted.

• Question 46:

  For which three objects must a vendor provide implementations in its JDBC driver?

  A. Time
  B. Date
  C. Statement
  D. ResultSet
  E. Connection
  F. SQLException
  G. DriverManager
  C. Statement
  D. ResultSet
  E. Connection

  ---

  All JDBC drivers implement the four important JDBC classes: Driver, Connection, Statement, and ResultSet.

• Question 47:

  Given the code fragment:

  try {

  String query = "SELECT * FROM Employee WHERE ID=110";

  Statement stmt = conn.createStatement();

  ResultSet rs = stmt.executeQuery(query);

  System.out.println("Employee ID: " + rs.getInt("ID"));

  } catch (Exception se) {

  System.out.println("Error");

  }

  Assume that the SQL query matches one record. What is the result of compiling and executing this code?

  A. The code prints Error.
  B. The code prints the employee ID.
  C. Compilation fails due to an error at line 13.
  D. Compilation fails due to an error at line 14.
  B. The code prints the employee ID.

  ---

  The code compiles fine. The code will rune fine.

  public int getInt(String columnName) throws SQLException Retrieves the value of the designated column in the current row of this ResultSet object as an int in the Java programming language

• Question 48:

  Given:

  import java.io.File;

  import java.nio.file.Path;

  public class Test12 {

  static String displayDetails(String path, int location) {

  Path p = new File(path).toPath();

  String name = p.getName(location).toString();

  return name;

  }

  public static void main(String[] args) {

  String path = "project//doc//index.html";

  String result = displayDetails(path,2);

  System.out.print(result);

  }

  }

  What is the result?

  A. doc
  B. index.html
  C. an IllegalArgumentException is thrown at runtime.
  D. An InvalidPthException is thrown at runtime.
  E. Compilation fails.
  B. index.html

• Question 49:

  What are two differences between Callable and Runnable?

  A. A callable can return a value when executing, but a Runnable cannot.
  B. A callable can be executed by a ExecutorService, but a Runnable cannot.
  C. A Callable can be passed to a Thread, but a Runnable cannot.
  D. A callable can throw an Exception when executing, but a Runnable cannot.
  A. A callable can return a value when executing, but a Runnable cannot.
  D. A callable can throw an Exception when executing, but a Runnable cannot.

  ---

  The Callable interface is similar to Runnable, in that both are designed for classes whose instances are potentially executed by another thread. A Runnable, however, does not return a result and cannot throw a checked exception.

• Question 50:

  Given:

  public class StringSplit01 {

  public static void main(String[] args) {

  String names = "John-.-George-.-Paul-.-Ringo";

  String[] results = names.split("-. .");

  for(String str:results) {

  System.out.println(str);

  }

  }

  }

  What is the result?

  A. John?. -George-. ?Paul -. ?Ringo
  B. John George Paul Ringo
  C. John George Paul Ringo
  D. An exception is thrown at runtime
  E. Compilation fails
  B. John George Paul Ringo

  ---

  The split() method is used to split a string into an array of substrings, and returns the new array.