Oracle 1Z0-850 Online Practice Questions and Exam Preparation

Oracle 1Z0-850 Online Questions & Answers

• Question 141:

  Which three classes are part of the java.io package? (Choose three.)

  A. File
  B. Socket
  C. URL
  D. Reader
  E. String
  F. BufferedWriter
  A. File
  D. Reader
  F. BufferedWriter

• Question 142:

  You need to create a class Foo that will record the number of times the go() method is invoked on a particular instance of the class. Which solution correctly implements this goal?

  A. Declare a local variable invokeCount inside the go() method, and increment the variable within the go() method.
  B. Declare a static variable invokeCount for the class Foo, and increment the variable within the go() method.
  C. Declare a method parameter invokeCount as the argument to the go() method, and increment the variable within the go() method.
  D. Declare an instance variable invokeCount for the class Foo, and increment the variable within the go() method.
  D. Declare an instance variable invokeCount for the class Foo, and increment the variable within the go() method.

• Question 143:

  Click the Exhibit button.

  Which attribute CANNOT be accessed from a Mountain object?

  

  A. view
  B. name
  C. climb
  D. height
  D. height

• Question 144:

  Which two technologies are primarily focused on developing Web Services? (Choose two.)

  A. UDDI
  B. JSP
  C. RDBMS
  D. WSDL
  E. JDBC
  A. UDDI
  D. WSDL

• Question 145:

  Click the Exhibit button.

  Which two classes can have two or more instances associated with a single instance of X. (Choose two.)

  

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

• Question 146:

  Which three are true? (Choose three.)

  A. If abstract class B directly extends abstract class A, class B must implement all abstract methods declared in A.
  B. An abstract class CANNOT be instantiated.
  C. An interface can extend multiple interfaces.
  D. All methods in an abstract class must be abstract.
  E. If concrete class C extends concrete class B, and B implements interface A, then all methods from interface A can be invoked on an instance of C.
  B. An abstract class CANNOT be instantiated.
  C. An interface can extend multiple interfaces.
  E. If concrete class C extends concrete class B, and B implements interface A, then all methods from interface A can be invoked on an instance of C.

• Question 147:

  Which two are true? (Choose two.)

  A. JavaScript is the standard J2SE scripting language.
  B. JavaScript includes built-in libraries for invoking methods on Enterprise JavaBeans.
  C. JavaScript can be used to create a rollover image effect in a web page.
  D. JavaScript can only be used in browsers that have the Java Plug-in installed.
  E. JavaScript can be used to validate form input values before they are sent to the server.
  C. JavaScript can be used to create a rollover image effect in a web page.
  E. JavaScript can be used to validate form input values before they are sent to the server.

• Question 148:

  Click the Exhibit button. Which correctly implements the relationship shown in the diagram?

  

  A. class Cat {Dog d;}class Dog { }
  B. class Cat { }class Dog {Cat c;}
  C. class Cat { }class Dog { }
  D. class Cat {Dog d;}class Dog {Cat c;}
  D. class Cat {Dog d;}class Dog {Cat c;}

• Question 149:

  Which two classes make valid use of the ArrayList class in package java.util? (Choose two.)

  A. package java.util;public class Test {public static void main(String args[]) {ArrayList list = new ArrayList ();}
  B. import java.util.ArrayList;public class Test {public static void main(String args[]) {ArrayList list = new ArrayList();}
  C. import java.util;public class Test {public static void main(String args[]) {ArrayList list = new ArrayList();}
  D. public class Test import java.util.ArrayList {public static void main(String args[]) {ArrayList list = new ArrayList();}
  E. public class Test {public static void main(String args[]) {java.util.ArrayList list = new java.util.ArrayList ();}
  F. package java.util.ArrayList;public class Test {public static void main(String args[]) {ArrayList list = new ArrayList();}
  B. import java.util.ArrayList;public class Test {public static void main(String args[]) {ArrayList list = new ArrayList();}
  E. public class Test {public static void main(String args[]) {java.util.ArrayList list = new java.util.ArrayList ();}

• Question 150:

  Which two are true? (Choose two.)

  A. A class that extends another class CANNOT be well encapsulated.
  B. If class B is well encapsulated, then class A can access class B's instance variables only through a method invocation.
  C. A class with a public instance variable CANNOT be well encapsulated.
  D. Polymorphism only applies when one class encapsulates another.
  B. If class B is well encapsulated, then class A can access class B's instance variables only through a method invocation.
  C. A class with a public instance variable CANNOT be well encapsulated.