Oracle Oracle Certifications 1Z0-808 Questions & Answers

• Question 171:

  Given the code fragment: List colors = new ArrayList(); colors.add("green"); colors.add("red"); colors.add("blue");

  colors.add("yellow"); colors.remove(2); colors.add(3,"cyan"); System.out.print(colors); What is the result?

  A. [green, red, yellow, cyan]

  B. [green, blue, yellow, cyan]

  C. [green, red, cyan, yellow]

  D. Am IndexOutOfBoundsException is thrown at runtime

  Correct Answer: B

• Question 172:

  Given the code fragment:

  

  Which modification enables the code to print 54321?

  A. Replace line 6 with System, out. print (--x) ;

  B. At line 7, insert x --;

  C. Replace line 6 with --x; and, at line 7, insert system, out. print (x);

  D. Replace line 12 With return (x > 0) ? false: true;

  Correct Answer: B

• Question 173:

  Given:

  

  What is the result?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: B

• Question 174:

  Given the code fragment: What is the result?

  

  A. Element 0 Element 1

  B. Null element 0 Null element 1

  C. Null Null

  D. A NullPointerException is thrown at runtime.

  Correct Answer: D

• Question 175:

  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!

  Correct Answer: B

• Question 176:

  Given:

  public class App {

  // Insert code here

  System.out.print("Welcome to the world of Java");

  }

  }

  Which two code fragments, when inserted independently at line // Insert code here, enable the program to execute and print the welcome message on the screen?

  A. static public void main (String [] args) {

  B. static void main (String [] args) {

  C. public static void Main (String [] args) {

  D. public static void main (String [] args) {

  E. public void main (String [] args) {

  Correct Answer: AD

  Incorrect:

  Not B: No main class found.

  Not C: Main method not found

  not E: Main method is not static.

• Question 177:

  Given:

  

  Which option enables the code to compile?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: D

• Question 178:

  Given the code fragment:

  

  Which code fragment, when inserted at line 9, enables the code to print true?

  A. String str2 = str1;

  B. String str2 = new String (str1);

  C. String str2 = sb1. toString ();

  D. String str2 = "Duke";

  Correct Answer: A

• Question 179:

  Given the code fragment:

  String[] cartoons = {"tom","jerry","micky","tom"};

  int counter =0;

  if ("tom".equals(cartoons[0])) {

  counter++;

  } else if ("tom".equals(cartoons[1])) {

  counter++;

  } else if ("tom".equals(cartoons[2])) {

  counter++;

  } else if ("tom".equals(cartoons[3])) {

  counter++;

  }

  System.out.print(counter);

  What is the result?

  A. 1

  B. 2

  C. 4

  D. 0

  Correct Answer: A

  Explanation: Counter++ will be executed only once because of the else if constructs.

• Question 180:

  Given:

  

  What would be the output, if it is executed as a program?

  A. name =, pass =

  B. name = null, pass = null

  C. name = null, pass = false

  D. name = null pass = true

  E. Compile error.

  Correct Answer: C

  Both name and pass variables are instance variables, and we haven't given them any values, so they take

  their default values. For Boolean default value is false and for string which is not a primitive type default is

  null So at line 7, null will printed as the value of the variable name, and at line 8 false will be printed. Hence

  Option C is correct. As explained above options A, B and D are incorrect.

  Code compiles fine so option E is incorrect.

  Reference:

  https://docs.oracle.com/javaseAutorial/java/javaOOAariables.html