Oracle 1Z0-803 Online Practice Questions and Exam Preparation

Oracle 1Z0-803 Online Questions & Answers

• Question 51:

  Given: Why will the code not compile?

  

  A. A static field cannot be private.
  B. The getLetter method has no body.
  C. There is no setLetter method.
  D. The letter field is uninitialized.
  E. It contains a method named Main instead of ma
  B. The getLetter method has no body.

  ---

  The getLetter() method needs a body public static int getLetter() { }; .

• Question 52:

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

  ---

  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 53:

  Which declaration initializes a boolean variable?

  A. boolean h = 1;
  B. boolean k = 0;
  C. boolean m = null;
  D. boolean j = (1 < 5);
  D. boolean j = (1 < 5);

  ---

  The primitive type boolean has only two possible values: true and false. Here j is set to (1 <5), which evaluates to true.

• Question 54:

  Given the code fragment:

  String h1 = "Bob";

  String h2 = new String ("Bob");

  What is the best way to test that the values of h1 and h2 are the same?

  A. if (h1 = = h2)
  B. if (h1.equals(h2))
  C. if (h1 = = h2)
  D. if (h1.same(h2))
  B. if (h1.equals(h2))

  ---

  The equals method compares values for equality.

  Incorrect answers:

  The strings are not the same objects so the == comparison fails. See note #1 below. As the value of the strings are the same equals is true. The equals compares values for equality.

  There is no generic comparison method named same.

  = = (with a space) is not a valid method.

  Note: #1 ==

  Compares references, not values. The use of == with object references is generally limited to the following:

  Comparing to see if a reference is null.

  Comparing two enum values. This works because there is only one object for each enum constant.

  You want to know if two references are to the same object.

• Question 55:

  Given the code fragment:

  int b = 3;

  if ( !(b > 3)) {

  System.out.println("square ");

  }{

  System.out.println("circle ");

  }

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

  What is the result?

  A. square...
  B. circle...
  C. squarecircle...
  D. Compilation fails.
  C. squarecircle...

• Question 56:

  Which three are valid types for switch?

  A. int
  B. float
  C. double
  D. integer
  E. String
  F. Float
  A. int
  D. integer
  E. String

  ---

  A switch works with the byte, short, char, and int primitive data types. It also works with enumerated types the String class, and a few special classes that wrap certain primitive types: Character, Byte, Short, and Integer.

• Question 57:

  public class ForTest {

  public static void main(String[] args) {

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

  for ( foo ) {

  }

  }

  }

  Which three are valid replacements for foo so that the program will compiled and run?

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

• Question 58:

  Given:

  

  What is the result?

  A. There is no output
  B. d is output
  C. A StringIndexOutOfBoundsException is thrown at runtime
  D. An ArrayIndexOutOfBoundsException is thrown at runtime
  E. A NullPointException is thrown at runtime
  F. A StringArrayIndexOutOfBoundsException is thrown at runtime
  C. A StringIndexOutOfBoundsException is thrown at runtime

  ---

  There are only 11 characters in the string "Hello World". The code theString.charAt(11) retrieves the 12th character, which does not exist. A StringIndexOutOfBoundsException is thrown. Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 11

• Question 59:

  Give:

  

  What value should replace kk in line x to cause jj = 5 to be output?

  A. -1
  B. 1
  C. 5
  D. 8
  E. 11
  E. 11

  ---

  We need to get jj to 5. It is initially set to 0. So we need to go through the for loop 5 times. The for loops ends when ii > 6 and ii decreases for every loop. So we need to initially set ii to 11. We set kk to 11.

• Question 60:

  Which code fragment cause a compilation error?

  A. flat flt = 100F;
  B. float flt = (float) 1_11.00;
  C. float flt = 100;
  D. double y1 = 203.22; floatflt = y1
  E. int y2 = 100; floatflt = (float) y2;
  B. float flt = (float) 1_11.00;