Oracle 1Z0-808 Online Practice Questions and Exam Preparation

Oracle 1Z0-808 Online Questions & Answers

• Question 291:

  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.
  C. Compilation fails at line n2.

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  Explanation/Reference:

• Question 292:

  Given the content of the Customer.java and Trader.java files:

  

  Which two methods can be overridden in the Trader class from the Customer class? (Choose two.)

  A. m2()
  B. m3()
  C. m4()
  D. m1()
  B. m3()
  D. m1()

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  Explanation/Reference:

  B: m3 is protected, but can be accessed if the other class extends the parent class even though it is in a different package.

  D: m1 is public, just by importing the package you can access it normally.

• Question 293:

  Which two statements are true for a two-dimensional array?

  A. It is implemented as an array of the specified element type.
  B. Using a row by column convention, each row of a two-dimensional array must be of the same size.
  C. At declaration time, the number of elements of the array in each dimension must be specified.
  D. All methods of the class Object may be invoked on the two-dimensional array.
  A. It is implemented as an array of the specified element type.
  D. All methods of the class Object may be invoked on the two-dimensional array.

• Question 294:

  Which three statements are true about the structure of a Java class?

  A. A class can have only one private constructor.
  B. A method can have the same name as a field.
  C. A class can have overloaded static methods.
  D. A public class must have a main method.
  E. The methods are mandatory components of a class.
  F. The fields need not be initialized before use.
  B. A method can have the same name as a field.
  C. A class can have overloaded static methods.
  D. A public class must have a main method.

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  Explanation/Reference:

• Question 295:

  Given the code fragment:

  public class ForTest {

  public static void main(String[] args) {

  int[] array = {1, 2, 3};

  for ( foo ) {

  }

  }

  Which three code fragments, when replaced individually for foo, enables the program to compile?

  A. int i : array
  B. int i = 0; i < 1;
  C. ; ;
  D. ; i < 1; i++
  E. i = 0; i
  A. int i : array
  B. int i = 0; i < 1;
  C. ; ;

• Question 296:

  Given the code fragment:

  

  What is the result?

  A. A B
  B. A element 0 B element 1
  C. A NullPointerExceptionis thrown at runtime.
  D. A 0 B 1
  A. A B

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  Explanation/Reference:

  The right answer is the A, remember that String is immutable, the "concat" method inside the for each as it didn't receive a variable wasn't storing anything, so it didn't change. And then at the time of printing, it printed A B because nothing has changed.

  NOTE: To concatenate a String variable, it would have to be -> | strs[idx] = strs[idx] + " element " + idx; | Instead of what's in the code.

• Question 297:

  Given the definitions of the MyString class and the Test class:

  

  What is the result?

  

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

• Question 298:

  Given:

  

  What is the result?

  A. 3 4 5 6
  B. 3 4 3 6
  C. 5 4 5 6
  D. 3 6 4 6
  C. 5 4 5 6

• Question 299:

  Given the code fragment:

  

  Which two modifications, made independently, enable the code to compile?

  A. Make the method at line n1 public.
  B. Make the method at line n2 public.
  C. Make the method at line n3 public.
  D. Make the method at line n3 protected.
  E. Make the method at line n4 public.
  C. Make the method at line n3 public.
  D. Make the method at line n3 protected.

• Question 300:

  Given the code fragment:

  

  Which option can replace xxx to enable the code to print 135?

  A. int e = 0; e < = 4; e++
  B. int e = 0; e < 5; e + = 2
  C. int e = 1; e < = 5; e + = 1
  D. int e = 1; e < 5; e+ =2
  B. int e = 0; e < 5; e + = 2