Oracle Oracle Certifications 1Z0-808 Questions & Answers

• Question 281:

  Given the content of three files:

  

  Which statement is true?

  Which statement is true?

  A. Only the A.Java file compiles successfully.

  B. Only the B.java file compiles successfully.

  C. Only the C.java file compiles successfully.

  D. The A.Java and B.java files compile successfully.

  E. The B.java and C.java files compile successfully.

  F. The A.Java and C.java files compile successfully.

  Correct Answer: A

  Explanation: In class B.Java doStuff() has access modifier with variable name which is not allowed. C.Java class name is different than file name. Only private classes can have different names than file names

• Question 282:

  You are developing a banking module. You have developed a class named ccMask that has a maskcc method.

  Given the code fragment:

  

  You must ensure that the maskcc method returns a string that hides all digits of the credit card number except the four last digits (and the hyphens that separate each group of four digits).

  Which two code fragments should you use at line n1, independently, to achieve this requirement?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: BC

• Question 283:

  Given:

  public class ScopeTest {

  int j, int k;

  public static void main(String[] args) {

  ew ScopeTest().doStuff(); }

  void doStuff() {

  nt x = 5;

  oStuff2();

  System.out.println("x");

  }

  void doStuff2() {

  nt y = 7;

  ystem.out.println("y");

  or (int z = 0; z < 5; z++) {

  ystem.out.println("z");

  ystem.out.println("y");

  }

  Which two items are fields?

  A. j

  B. k

  C. x

  D. y

  E. z

  Correct Answer: AB

• Question 284:

  Given:

  abstract class A1 {

  public abstract void m1();

  public void m2() { System.out.println("Green"); }

  }

  abstract class A2 extends A1 {

  public abstract void m3();

  public void m1() { System.out.println("Cyan"); }

  public void m2() { System.out.println("Blue"); }

  }

  public class A3 extends A2 {

  public void m1() { System.out.println("Yellow"); }

  public void m2() { System.out.println("Pink"); }

  public void m3() { System.out.println("Red"); }

  public static void main(String[] args) {

  A2 tp = new A3();

  tp.m1();

  tp.m2();

  tp.m3();

  }

  }

  What is the result?

  A. Yellow Pink Red

  B. Cyan Blue Red

  C. Cyan Green Red D. Compilation Fails

  Correct Answer: A

• Question 285:

  Given the following classes:

  

  Which two options fail to compile when placed at line n1 of the main method?

  A. employee.salary = 50_000;

  B. director.salary = 80_000;

  C. employee.budget = 200_000;

  D. manager.budget = 1_000_000;

  E. manager.stockOption = 500;

  F. director.stockOptions = 1_000;

  Correct Answer: CE

• Question 286:

  Given the code format: Which code fragment must be inserted at line 6 to enable the code to compile?

  

  A. DBConfiguration f; return f;

  B. Return DBConfiguration;

  C. Return new DBConfiguration;

  D. Retutn 0;

  Correct Answer: B

• Question 287:

  Given:

  public class MyClass {

  public static void main(String[] args) {

  while (int ii = 0; ii < 2) {

  ii++;

  System.out.println("ii = " + ii);

  }

  }

  }

  What is the result?

  A. ii = 1 ii = 2

  B. Compilation fails

  C. The program prints nothing

  D. The program goes into an infinite loop with no output

  E. The program goes to an infinite loop outputting: ii = 1 ii = 1

  Correct Answer: B

  Explanation: The while statement is incorrect. It has the syntax of a for statement.

  The while statement continually executes a block of statements while a particular condition is true. Its

  syntax can be expressed as:

  while (expression) {

  statement(s)

  }

  The while statement evaluates expression, which must return a boolean value. If the expression evaluates

  to true, the while statement executes the statement(s) in the while block. The while statement continues

  testing the expression and executing its block until the expression evaluates to false.

  Reference: The while and do-while Statements

• Question 288:

  Given:

  

  What is the result?

  A. 0 Done

  B. First Exception Done

  C. Second Exception

  D. Done Third Exception

  E. Third Exception

  Correct Answer: B

• Question 289:

  Given:

  

  What is the result?

  A. 10 20 30 40

  B. 0 0 30 40

  C. Compilation fails

  D. An exception is thrown at runtime

  Correct Answer: B

• Question 290:

  Which two statements correctly describe checked exception?

  A. These are exceptional conditions that a well-written application should anticipate and recover from.

  B. These are exceptional conditions that are external to the application, and that the application usually cannot anticipate or recover from.

  C. These are exceptional conditions that are internal to the application, and that the application usually cannot anticipate or recover from.

  D. Every class that is a subclass of RuntimeException and Error is categorized as checked exception.

  E. Every class that is a subclass of Exception, excluding RuntimeException and its subclasses, is categorized as checked exception.

  Correct Answer: BD

  Explanation: Checked exceptions:

  *

  (B) represent invalid conditions in areas outside the immediate control of the program (invalid user input, database problems, network outages, absent files)

  *

  are subclasses of Exception It's somewhat confusing, but note as well that RuntimeException (unchecked) is itself a subclass of Exception (checked).

  *

  a method is obliged to establish a policy for all checked exceptions thrown by its implementation (either pass the checked exception further up the stack, or handle it somehow)

  Reference: Checked versus unchecked exceptions