Oracle 1Z0-850 Online Practice Questions and Exam Preparation

Oracle 1Z0-850 Online Questions & Answers

• Question 231:

  Given:

  5.

  // insert code here

  6.

  public abstract void bark();

  7.

  }

  8.

  9.

  // insert code here

  10.

  public void bark() {

  11.

  System.out.println("woof");

  12.

  }

  13.

  }

  Which, inserted at lines 5 and 9, allows the file to compile?

  A. 5. abstract Dog {9. public class Poodle extends Dog {
  B. 5. class Dog {9. public class Poodle extends Dog {
  C. 5. abstract Dog {9. public class Poodle implements Dog {
  D. 5. abstract class Dog {9. public class Poodle implements Dog {
  E. 5. class Dog {9. public class Poodle implements Dog {
  F. 5. abstract class Dog {9. public class Poodle extends Dog {
  F. 5. abstract class Dog {9. public class Poodle extends Dog {

• Question 232:

  Which two technologies are used for processing HTTP requests and mapping those requests to business objects? (Choose two.)

  A. web services
  B. JMS
  C. EJB
  D. servlets
  A. web services
  D. servlets

• Question 233:

  Which two are true? (Choose two.)

  A. MIDP does NOT have an API to support text messaging.
  B. J2ME can be used to make network-connected household appliances.
  C. A MIDP device must support wireless downloading of software.
  D. MIDP does NOT have an API to support audio.
  B. J2ME can be used to make network-connected household appliances.
  C. A MIDP device must support wireless downloading of software.

• Question 234:

  Which two are benefits when appropriately using polymorphism? (Choose two.)

  A. code that is protected from extension by other classes
  B. code that is more dynamic at runtime
  C. code that is faster at runtime
  D. code that is more flexible and reusable
  E. code that is more efficient at runtime
  B. code that is more dynamic at runtime
  D. code that is more flexible and reusable

• Question 235:

  Which two are true? (Choose two.)

  A. SQL commands cannot be contained in servlets.
  B. SQL technology is used to access JMS queues from within EJB technology.
  C. SQL allows you to modify multiple rows in a table with a single command.
  D. SQL is a web services technology used to parse large XML files.
  E. SQL commands can be written in applications that use NO Java technologies.
  C. SQL allows you to modify multiple rows in a table with a single command.
  E. SQL commands can be written in applications that use NO Java technologies.

• Question 236:

  Which type of primitive can be assigned a new value within a conditional expression?

  A. boolean
  B. int
  C. short
  D. char
  E. byte
  A. boolean

• Question 237:

  Which two are true? (Choose two.)

  A. Classes in the java.awt package are used to paint objects on canvases.
  B. Classes in the java.awt package inherit many behaviors from classes in the java.swing package.
  C. Classes in the javax.swing package provide support for complex GUI components, such as tables and trees.
  D. Classes in the java.awt package are designed to provide lightweight components that work the same across different platforms.
  A. Classes in the java.awt package are used to paint objects on canvases.
  C. Classes in the javax.swing package provide support for complex GUI components, such as tables and trees.

• Question 238:

  A J2EE programmer is developing components to encapsulate the business logic in a multitier web- based application. Which J2EE technology is appropriate?

  A. JMS B. JNDI
  C. JAX-RPC
  D. EJB
  E. servlets
  D. EJB

• Question 239:

  A Java programmer wants to develop a small application to run on mobile phones. Which Java edition (or editions) are required to develop the application?

  A. only J2ME
  B. J2EE and J2ME
  C. J2SE and J2ME
  D. only J2EE
  E. J2SE and J2EE
  F. only J2SE
  C. J2SE and J2ME

• Question 240:

  Given:

  1.

  class X {

  2.

  private Y y;

  3.

  public X(Y y) { this.y = y; }

  4.

  }

  5.

  class Y {

  6.

  private X x;

  7.

  public Y() { }

  8.

  public Y(X x) { this.x = x; }

  9.

  }

  The instance variable y is intended to represent the composition relationship "X is composed of Y."

  Which code correctly maintains this meaning?

  A. Y yy = new Y();X x1 = new X(yy);X x2 = new X(yy);
  B. X xx = new X(null);Y y1 = new Y(xx);Y y2 = new Y(xx);
  C. X x1 = new X(new Y());X x2 = new X(new Y());
  D. Y y1 = new Y(new X(null));Y y2 = new Y(new X(null));
  C. X x1 = new X(new Y());X x2 = new X(new Y());