Oracle 1Z0-803 Online Practice Questions and Exam Preparation

Oracle 1Z0-803 Online Questions & Answers

• Question 201:

  Which three statements are benefits of encapsulation?

  A. Allows a class implementation to change without changing t he clients
  B. Protects confidential data from leaking out of the objects
  C. Prevents code from causing exceptions
  D. Enables the class implementation to protect its invariants
  E. Permits classes to be combined into the same package
  F. Enables multiple instances of the same class to be created safely
  A. Allows a class implementation to change without changing t he clients
  B. Protects confidential data from leaking out of the objects
  D. Enables the class implementation to protect its invariants

• Question 202:

  Given the code fragment:

  

  A. Super Sub Sub
  B. Contract Contract Super
  C. Compilation fails at line n1
  D. Compilation fails at line n2
  D. Compilation fails at line n2

• Question 203:

  Given:

  

  What is the result?

  A. 1
  B. 1
  C. 2
  D. Compilation fails
  E. The loop executes infinite times
  D. Compilation fails

• Question 204:

  Given:

  class Mid {

  public int findMid(int n1, int n2) {

  return (n1 + n2) / 2;

  }

  }

  public class Calc extends Mid {

  public static void main(String[] args) {

  int n1 = 22, n2 = 2;

  // insert code here

  System.out.print(n3);

  }

  }

  Which two code fragments, when inserted at // insert code here, enable the code to compile and print 12?

  A. Calc c = new Calc(); int n3 = c.findMid(n1,n2);
  B. int n3 = super.findMid(n1,n3);
  C. Calc c = new Mid(); int n3 = c.findMid(n1, n2);
  D. Mid m1 = new Calc(); int n3 = m1.findMid(n1, n2);
  E. int n3 = Calc.findMid(n1, n2);
  A. Calc c = new Calc(); int n3 = c.findMid(n1,n2);
  D. Mid m1 = new Calc(); int n3 = m1.findMid(n1, n2);

  ---

  Incorrect: Not B: circular definition of n3. Not C: Compilation error. line Calc c = new Mid(); required: Calc found: Mid Not E: Compilation error. line int n3 = Calc.findMid(n1, n2); non-static method findMid(int,int) cannot be referenced from a static context

• Question 205:

  Given the fragments: Which line causes a compilation error?

  

  A. Line n1
  B. Line n2
  C. Line n3
  D. Line n4
  A. Line n1

• Question 206:

  Given:

  

  Which two classes use the shape class correctly?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  E. Option E
  F. Option F
  B. Option B
  E. Option E

  ---

  When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (E). However, if it does not, then the subclass must also be declared abstract (B). Note: An abstract class is a class that is declared abstract--it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.

• Question 207:

  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
  A. Yellow Pink Red

• Question 208:

  Given:

  public class Painting {

  private String type;

  public String getType() {

  return type;

  }

  public void setType(String type) {

  this.type = type;

  }

  public static void main(String[] args) {

  Painting obj1 = new Painting();

  Painting obj2 = new Painting();

  obj1.setType(null);

  obj2.setType("Fresco");

  System.out.print(obj1.getType() + " : " + obj2.getType()); }

  }

  What is the result?

  A. : Fresco
  B. null : Fresco
  C. Fresco : Fresco
  D. A NullPointerException is thrown at runtime
  B. null : Fresco

• Question 209:

  Given:

  public class Test {

  public static void main(String[] args) {

  int arr[] = new int[4];

  arr[0] = 1;

  arr[1] = 2;

  arr[2] = 4;

  arr[3] = 5;

  int sum = 0;

  try {

  for (int pos = 0; pos <= 4; pos++) {

  sum = sum + arr[pos];

  }

  } catch (Exception e) {

  System.out.println("Invalid index");

  }

  System.out.println(sum);

  }

  }

  What is the result?

  A. 12
  B. Invalid Index
  C. Invalid Index D. Compilation fails
  B. Invalid Index

  ---

  The loop ( for (int pos = 0; pos <= 4; pos++) { ), it should be pos <= 3, causes an exception, which is caught. Then the correct sum is printed.

• Question 210:

  Given:

  public class Test {

  static boolean bVar;

  public static void main(String[] args) {

  boolean bVar1 = true;

  int count =8;

  do {

  System.out.println("Hello Java! " +count);

  if (count >= 7) {

  bVar1 = false;

  }

  } while (bVar != bVar1 andand count > 4);

  count -= 2;

  }

  }

  What is the result?

  A. Hello Java! 8 Hello Java! 6 Hello Java! 4
  B. Hello Java! 8 Hello Java! 6
  C. Hello Java! 8
  D. Compilation fails
  C. Hello Java! 8