Oracle 1Z0-803 Online Practice Questions and Exam Preparation

Oracle 1Z0-803 Online Questions & Answers

• Question 81:

  Given a java source file: What changes will make this code compile? (Select Two)

  

  A. Adding the public modifier to the declaration of class x
  B. Adding the protected modifier to the x() constructor
  C. Changing the private modifier on the declaration of the one() method to protected
  D. Removing the Y () constructor
  E. Removing the private modifier from the two () method
  C. Changing the private modifier on the declaration of the one() method to protected
  E. Removing the private modifier from the two () method

  ---

  Using the private protected, instead of the private modifier, for the declaration of the one() method, would enable the two() method to access the one() method.

• Question 82:

  Given the code fragment?

  public class Test {

  public static void main(String[] args) {

  Test t = new Test();

  int[] arr = new int[10];

  arr = t.subArray(arr,0,2);

  }

  // insert code here

  }

  Which method can be inserted at line // insert code here to enable the code to compile?

  A. public int[] subArray(int[] src, int start, int end) { return src; }
  B. public int subArray(int src, int start, int end) { return src; }
  C. public int[] subArray(int src, int start, int end) { return src; }
  D. public int subArray(int[] src, int start, int end) { return src; }
  A. public int[] subArray(int[] src, int start, int end) { return src; }

• Question 83:

  View the Exhibit.

  public class Hat {

  public int ID =0;

  public String name = "hat";

  public String size = "One Size Fit All";

  public String color="";

  public String getName() { return name; }

  public void setName(String name) {

  this.name = name;

  }

  }

  Given

  public class TestHat {

  public static void main(String[] args) {

  Hat blackCowboyHat = new Hat();

  }

  }

  Which statement sets the name of the Hat instance?

  A. blackCowboyHat.setName = "Cowboy Hat";
  B. setName("Cowboy Hat");
  C. Hat.setName("Cowboy Hat");
  D. blackCowboyHat.setName("Cowboy Hat");
  D. blackCowboyHat.setName("Cowboy Hat");

• Question 84:

  Given the code fragment

  

  Which code fragments, inserted independently, enable the code compile?

  A. t.fvar = 200;
  B. cvar = 400;
  C. fvar = 200; cvar = 400;
  D. this.fvar = 200; this.cvar = 400;
  E. t.fvar = 200; Test2.cvar = 400;
  F. this.fvar = 200; Test2.cvar = 400;
  B. cvar = 400;

• Question 85:

  public class StringReplace {

  public static void main(String[] args) {

  String message = "Hi everyone!";

  System.out.println("message = " + message.replace("e", "X")); } }

  What is the result?

  A. message = Hi everyone!
  B. message = Hi XvXryonX!
  C. A compile time error is produced.
  D. A runtime error is produced.
  E. message =
  F. message = Hi Xveryone!
  B. message = Hi XvXryonX!

• Question 86:

  Given: What is the result?

  

  A. 11, 21, 31, 11, 21, 31
  B. 11, 21, 31, 12, 22, 32
  C. 12, 22, 32, 12, 22, 32
  D. 10, 20, 30, 10, 20, 30
  D. 10, 20, 30, 10, 20, 30

• Question 87:

  Which statement is true about the default constructor of a top-level class?

  A. It can take arguments.
  B. It has private access modifier in its declaration.
  C. It can be overloaded.
  D. The default constructor of a subclass always invokes the no-argument constructor of its superclass.
  D. The default constructor of a subclass always invokes the no-argument constructor of its superclass.

  ---

  In both Java and C#, a "default constructor" refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class. The default constructor is also empty, meaning that it does nothing. A programmer-defined constructor that takes no parameters is also called a default constructor.

• Question 88:

  Given:

  

  What is the result?

  A. The sum is 2
  B. The sum is 14
  C. The sum is 15
  D. The loop executes infinite times
  E. Compilation fails
  D. The loop executes infinite times

• Question 89:

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

  ---

  extends is for extending a class.

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

• Question 90:

  Given the code fragment:

  public class Test {

  static String[][] arr =new String[3][];

  private static void doPrint() {

  //insert code here

  }

  public static void main(String[] args) {

  String[] class1 = {"A","B","C"};

  String[] class2 = {"L","M","N","O"};

  String[] class3 = {"I","J"};

  arr[0] = class1;

  arr[1] = class2;

  arr[2] = class3;

  Test.doPrint();

  }

  }

  Which code fragment, when inserted at line //insert code here, enables the code to print COJ?

  A. int i = 0; for (String[] sub: arr) { int j = sub.length -1; for (String str: sub) { System.out.println(str[j]); i++; } }
  B. private static void doPrint() { for (int i = 0;i < arr.length;i++) { int j = arr[i].length-1; System.out.print(arr[i][j]); } }
  C. int i = 0; for (String[] sub: arr[][]) { int j = sub.length; System.out.print(arr[i][j]); i++; }
  D. for (int i = 0;i < arr.length-1;i++) { int j = arr[i].length-1; System.out.print(arr[i][j]); i++; }
  B. private static void doPrint() { for (int i = 0;i < arr.length;i++) { int j = arr[i].length-1; System.out.print(arr[i][j]); } }

  ---

  Incorrect:

  not A: The following line causes a compile error:

  System.out.println(str[j]);

  Not C: Compile erro line:

  for (String[] sub: arr[][])

  not D: Output: C