Oracle Oracle Certifications 1Z0-808 Questions & Answers

• Question 151:

  Which usage represents a valid way of compiling java source file with the name "Main"?

  A. javac Main.java

  B. java Main.class

  C. java Main.java

  D. javac Main

  E. java Main

  Correct Answer: A

  Explanation: The compiler is invoked by the javac command. When compiling a Java class, you must include the file name, which houses the main classes including the Java extension. So to run Main.java file we have to use command in option A. TO execute Java program we can use Java command but can't use it for compiling. https://docs.oracle.com/javase/tutorial/getStarted/application/index.html

• Question 152:

  Given the code fragment:

  

  What is the result?

  A. A B C Work done

  B. A B C D Work done

  C. A Work done

  D. Compilation fails

  Correct Answer: C

• Question 153:

  Which two are valid array declaration?

  A. Object array[];

  B. Boolean array[3];

  C. int[] array;

  D. Float[2] array;

  Correct Answer: AC

• Question 154:

  Given the code fragment:

  

  Which three code fragments can be independently inserted at line nl to enable the code to print one?

  A. Byte x = 1;

  B. short x = 1;

  C. String x = "1";

  D. Long x = 1;

  E. Double x = 1;

  F. Integer x = new Integer ("1");

  Correct Answer: ABF

• Question 155:

  Given:

  

  What is the output?

  A. 1Z0

  B. 1Z0-808

  C. An exception will be thrown.

  D. Compilation fails due to error at line 3.

  E. Compilation tails due to error at line 4.

  Correct Answer: E

  Option E is the correct answer. Code fails to compile because there is no method called concert in StringBuilder class. The concert method is in String class. Hence option E is correct Here we should have used append method of StringBuilder class, in that case option B would be correct. https://docs.oracle.com/javase/tutorial/java/ data/buffers.html

• Question 156:

  Given the code fragment: What is the result?

  

  A. Match 1

  B. Match 2

  C. No Match

  D. A NullPointerException is thrown at runtime.

  Correct Answer: A

• Question 157:

  Given the following class:

  

  And given the following main method, located in another class:

  

  Which three lines, when inserted independently at line n1, cause the program to print a o balance?

  A. this.amount = 0;

  B. acct.setAmount(0);

  C. acct (0) ;

  D. acct.amount = 0;

  E. acct. getAmount () = 0;

  F. acct.changeAmount(0);

  G. acct.changeAmount(-acct.amount);

  H. acct.changeAmount(-acct.getAmount());

  Correct Answer: BDG

• Question 158:

  Given:

  class Overloading {

  int x(double d) {

  System.out.println("one");

  return 0;

  }

  String x(double d) {

  System.out.println("two");

  return null;

  }

  double x(double d) {

  System.out.println("three");

  return 0.0;

  }

  public static void main(String[] args) {

  new Overloading().x(4.0);

  }

  }

  What is the result?

  A. One

  B. Two

  C. Three

  D. Compilation fails.

  Correct Answer: D

• Question 159:

  Given:

  

  And given the code fragment:

  

  What is the result?

  A. 300:300

  200:300

  B. 300:100

  200:300

  C. 300:0

  0:300

  D. 200:300

  200:300

  Correct Answer: B

• Question 160:

  Given:

  

  And given the code fragment:

  

  What is the result?

  A. C2C2

  B. C1C2

  C. C1C1

  D. Compilation fails

  Correct Answer: D