Oracle Oracle Certifications 1Z0-808 Questions & Answers

• Question 221:

  Given the following main method:

  

  What is the result?

  A. 5 4 3 2 1 0

  B. 5 4 3 2 1

  C. 4 2 1

  D. 5

  E. Nothing is printed

  Correct Answer: D

  Loop will run only once and after that num == 0 will break it After first cycle of the loop.

• Question 222:

  Given:

  

  What is the result?

  A. Null

  B. Compilation fails

  C. An exception is thrown at runtime

  D. 0

  Correct Answer: C

• Question 223:

  What is the proper way to defined a method that take two int values and returns their sum as an int value?

  A. int sum(int first, int second) { first + second; }

  B. int sum(int first, second) { return first + second; }

  C. sum(int first, int second) { return first + second; }

  D. int sum(int first, int second) { return first + second; }

  E. void sum (int first, int second) { return first + second; }

  Correct Answer: D

• Question 224:

  Given:

  public class SampleClass {

  public static void main(String[] args) {

  AnotherSampleClass asc = new AnotherSampleClass(); SampleClass sc = new SampleClass();

  sc = asc;

  System.out.println("sc: " + sc.getClass()); System.out.println("asc: " + asc.getClass());

  }}

  class AnotherSampleClass extends SampleClass {

  }

  What is the result?

  A. sc: class Object asc: class AnotherSampleClass

  B. sc: class SampleClass asc: class AnotherSampleClass

  C. sc: class AnotherSampleClass asc: class SampleClass

  D. sc: class AnotherSampleClass asc: class AnotherSampleClass

  Correct Answer: D

• Question 225:

  Given the code fragment:

  

  What could expression1 and expression2 be, respectively, in order to produce output ?, 16?

  A. + +a, - -b

  B. + +a, b-

  C. A+ +, - - b

  D. A + +, b -

  Correct Answer: D

• Question 226:

  Given the code fragment: What is the result?

  

  A. Sum is 600

  B. Compilation fails at line n1.

  C. Compilation fails at line n2.

  D. A ClassCastException is thrown at line n1.

  E. A ClassCastException is thrown at line n2.

  Correct Answer: C

• Question 227:

  Given the code fragment:

  class Student {

  int rollnumber;

  String name;

  List cources = new ArrayList();

  // insert code here

  public String toString() {

  return rollnumber + " : " + name + " : " + cources;

  }

  }

  And,

  public class Test {

  public static void main(String[] args) {

  List cs = newArrayList();

  cs.add("Java");

  cs.add("C");

  Student s = new Student(123,"Fred", cs);

  System.out.println(s);

  }

  }

  Which code fragment, when inserted at line // insert code here, enables class Test to print 123 : Fred :

  [Java, C]?

  A. private Student(int i, String name, List cs) { /* initialization code goes here */ }

  B. public void Student(int i, String name, List cs) { /* initialization code goes here */ }

  C. Student(int i, String name, List cs) { /* initialization code goes here */ }

  D. Student(int i, String name, ArrayList cs) { /* initialization code goes here */ }

  Correct Answer: C

  Incorrect:

  Not A: Student has private access line: Student s = new Student(123,"Fred", cs); Not D: Cannot be applied

  to given types. Line: Student s = new Student(123,"Fred", cs);

• Question 228:

  Given the following four Java file definitions:

  // Foo.java

  package facades;

  public interface Foo { }

  // Boo.java

  package facades;

  public interface Boo extends Foo { }

  // Woofy.java

  package org.domain

  // line n1

  public class Woofy implements Boo, Foo { }

  // Test.java

  package.org;

  public class Test {

  public static void main(String[] args) {

  Foo obj=new Woofy();

  Which set modifications enable the code to compile and run?

  A. At line n1, Insert: import facades;At line n2, insert:import facades;import org.domain;

  B. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.*;

  C. At line n1, Insert: import facades.*;At line n2, insert:import facades.Boo;import org.*;

  D. At line n1, Insert: import facades.Foo, Boo;At line n2, insert:import org.domain.Woofy;

  E. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.domain.Woofy;

  Correct Answer: E

• Question 229:

  Given:

  

  What is the result?

  A. 120

  B. 120D

  C. A NumberFormatException will be thrown.

  D. Compilation fails due to error at line 5.

  E. Compilation tails due to error at line 8.

  Correct Answer: E

  At line 5, we have created a wrapper object of double by passing 120D, which is convertible to a Double, so there won't be any exception there. But if you check carefully, you can see the variable number is declared inside try block, so the scope of the variable number is limited to that block, so trying to access it outside causes a compile time error. httpsy/docs.oracle.com/javase/tutorial/iava/nutsandbolts/ variables.html

• Question 230:

  Given:

  

  What is the result?

  A. simaple A

  B. Capital A

  C. simaple A default Capital A

  D. simaple A default

  E. Compilation fails.

  Correct Answer: C

  Here we have to use two ternary operators combined. SO first we can use to check first condition which is x > 10, as follows; x>10?">": (when condition false) Now we have to use another to check if x<10 as follows; x<10?V:"=" We can combine these two by putting last ternary statement in the false position of first ternary statement as follows; x>10?">":x<10?'<':"=" https;//docs.oraclexom/javase/tutorial/java/nutsandbolts/if.html