Oracle Oracle Certifications 1Z0-808 Questions & Answers

• Question 201:

  Given the following code:

  

  What is the output?

  A. 4 4

  B. 3 5

  C. 4 7

  D. 5 4

  E. 4 5

  F. 4 21

  Correct Answer: E

• Question 202:

  Which of the following data types will allow the following code snippet to compile?

  

  A. long

  B. double

  C. int

  D. float

  E. byte

  Correct Answer: BD

  Option B and D are the correct answer.

  Since the variables I and j are floats, resultant will be float type too. So we have to use float or primitive

  type which can hold float, such a primitive type is double, it has wider range and also can hold floating

  point numbers, hence we can use double or float for the blank.

  As explained above options B and D are correct.

  long and int can't be used with floating point numbers so option A is incorrect. Option E is incorrect as it

  have smaller range and also can't be used with floating point numbers.

  hnpsy/docs.oracle.com/javase/tutorial/java/javaOO/variables.html

• Question 203:

  Given:

  Class A { }

  Class B { }

  Interface X { }

  Interface Y { }

  Which two definitions of class C are valid?

  A. Class C extends A implements X { }

  B. Class C implements Y extends B { }

  C. Class C extends A, B { }

  D. Class C implements X, Y extends B { }

  E. Class C extends B implements X, Y { }

  Correct Answer: AE

  Explanation: extends is for extending a class.

  implements is for implementing an interface. Java allows for a class to implement many interfaces.

• Question 204:

  Which two items can legally be contained within a java class declaration?

  A. An import statement

  B. A field declaration

  C. A package declaration

  D. A method declaration

  Correct Answer: BD

  Reference: http://docs.oracle.com/javase/tutorial/java/javaOO/methods.html

• Question 205:

  Consider following method

  

  Which statement is true?

  A. This method is invalid.

  B. This method can be used only in an interface.

  C. This method can return anything.

  D. This method can be used only in an interface or an abstract class.

  E. None of above.

  Correct Answer: B

  Given method is declared as default method so we can use it only inside an interface. Hence option B is correct and option D is incorrect. Option A is incorrect as it is valid method. Option C is incorrect as return type is void, which means we can't return anything.

• Question 206:

  Given:

  package p1;

  public class Test {

  static double dvalue;

  static Test ref;

  public static void main(String[] args) {

  System.out.println(ref);

  System.out.println(dvalue);

  }

  }

  What is the result?

  A. p1.Test.class

  0.0

  B. 0.000000

  C. Null

  0.0

  D. Compilation fails

  E. A NullPointerException is thrown at runtime

  Correct Answer: C

• Question 207:

  Given: What is the result?

  

  A. myStr: 9009, myNum: 9009

  B. myStr: 7007, myNum: 7007

  C. myStr: 7007, myNum: 9009

  D. Compilation fails

  Correct Answer: C

• Question 208:

  int i, j=0;

  i = (3* 2 +4 +5 ) ;

  j = (3 * ((2+4) + 5));

  System.out.println("i:"+ i + "\nj":+j);

  What is the result?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: B

• Question 209:

  Given:

  interface Pet { }

  class Dog implements Pet { }

  public class Beagle extends Dog{ }

  Which three are valid?

  A. Pet a = new Dog();

  B. Pet b = new Pet();

  C. Dog f = new Pet();

  D. Dog d = new Beagle();

  E. Pet e = new Beagle();

  F. Beagle c = new Dog();

  Correct Answer: ADE

  Incorrect:

  Not B, not C: Pet is abstact, cannot be instantiated. Not F: incompatible type. Required Beagle, found Dog.

• Question 210:

  Given: And the commands: Javac Test.java Java Test 12345 What is the result?

  

  A. Number us : 12345

  B. A NullPointerException is thrown at runtime

  C. A NumberFormatException is thrown at runtime

  D. AnArrayIndexOutOfBoundException is thrown at runtime.

  Correct Answer: A