Tag: technology

Quizzes (307) Questions (36705)

Questions Related to technology

Multiple choice technology programming languages

17 Which of the following statements are true?

  1. a. An interface can only contain method and not variables

  2. b. Interfaces cannot have constructors

  3. c. A class may extend only one other class and implement only one interface

  4. d. Interfaces are the Java approach to addressing its lack of multiple inheritance, but require implementing classes to create the functionality of the Interfaces.
Reveal answer Fill a bubble to check yourself
B Correct answer
Full explanation
Multiple choice technology programming languages

18 You have a public class called myclass with the main method defined as follows public static void main(String parm[]){ System.out.println(parm[0]); } If you attempt to compile the class and run the program as follows java myclass hello What will happen?

  1. a. Compile time error, main is not correctly defined

  2. b. Run time error, main is not correctly defined

  3. c. Compilation and output of java

  4. d. Compilation and output of hello
Reveal answer Fill a bubble to check yourself
D Correct answer
Full explanation
Multiple choice technology programming languages

Given: 11. public static void main(String[] args) { 12. try { 13. args=null; 14. args[0] = “test”; 15. System.out.println(args[0]); 16. } catch (Exception ex) { 17. System.out.println(”Exception”); 18. } catch (NullPointerException npe) { 19. System.out.println(”NullPointerException”); 20. } 21. } What is the result?

  1. test

  2. Exception

  3. Compilation fails.

  4. NullPointerException
Reveal answer Fill a bubble to check yourself
C Correct answer
Full explanation
Multiple choice technology programming languages

Given: 11. static classA { 12. void process() throws Exception { throw new Exception(); } 13. } 14. static class B extends A { 15. void process() { System.out.println(”B “); } 16. } 17. public static void main(String[] args) { 18.A a=new B(); 19. a.process(); 20.} What is the result?

  1. B

  2. The code runs with no output.

  3. An exception is thrown at runtime.

  4. Compilation fails because of an error in line 15.

  5. Compilation fails because of an error in line 18.

  6. Compilation fails because of an error in line 19.
Reveal answer Fill a bubble to check yourself
F Correct answer
Multiple choice technology programming languages

Given: 11. public static Iterator reverse(List list) { 12. Collections.reverse(list); 13. return list.iterator(); 14. } 15. public static void main(String[] args) { 16. List list = new ArrayList(); 17. list.add(” 1”); list.add(”2”); list.add(”3”); 18. for (Object obj: reverse(list)) 19. System.out.print(obj + “,”); 20. } ‘What is the result?

  1. 3,2, 1,

  2. 1, 2, 3,

  3. Compilation fails.

  4. The code runs with no output.

  5. An exception is thrown at runtime.
Reveal answer Fill a bubble to check yourself
C Correct answer
Full explanation
Multiple choice technology programming languages

Given: 11. public class Bootchy { 12. int bootch; 13. String snootch; 14. 15. public Bootchy() { 16. this(”snootchy”); 17. System.out.print(”first “); 18. } 19. 20. public Bootchy(String snootch) { 21. this(420, “snootchy”); 22. System.out.print(”second “); 23. } 24. 25. public Bootchy(int bootch, String snootch) { 26. this.bootch = bootch; 27. this.snootch = snootch; 28. System.out.print(”third “); 29. } 30. 31. public static void main(String[] args) { 32. Bootchy b = new Bootchy(); 33. System.out.print(b.snootch +“ “ + b.bootch); 34. } 35. } What is the result?

  1. snootchy 420 third second first

  2. snootchy 420 first second third

  3. first second third snootchy 420

  4. third second first siiootchy 420

  5. third first second snootchy 420

  6. first second first third snootchy 420
Reveal answer Fill a bubble to check yourself
D Correct answer
Full explanation