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programming languages Online Quiz - 22

Description: programming languages Online Quiz - 22
Number of Questions: 20
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Tags: programming languages
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What is an ArrayList?

  1. Class

  2. Interface

  3. Abstract Class

  4. All of the above


Correct Option: A

What are the constructors of ArrayList?

  1. ArrayList( )

  2. ArrayList(Collection c)

  3. ArrayList(int capacity)

  4. All of the Above


Correct Option: D

What is the Parent Class of ArraList?

  1. AbstractList

  2. List

  3. Array

  4. All of the Above


Correct Option: A

What is difference between array & arraylist?

  1. Array: can store primitive ArrayList: Stores object only

  2. Array: fix size ArrayList: resizable

  3. Array: can have multi dimensional ArrayList: can have multi dimensional

  4. Array: lang ArrayList: Collection framework


Correct Option: A,B,D

Which implementation of the List interface provides for the fastest insertion of a new element into the middle of the list?

  1. Vector

  2. Array List

  3. Linked List

  4. None of the above


Correct Option: C

What is the List interface?

  1. The Set interface

  2. list stores elements in an ordered way but may contain duplicate elements

  3. List interface provides support for ordered collections of objects.

  4. All of the above


Correct Option: C

What is an Iterator ?

  1. Enables you to cycle through a collection in the forward direction only, for obtaining or removing elements

  2. just for loop

  3. while loop

  4. It is an class for storing objects


Correct Option: A

Given: • d is a valid, non-null Date object • df is a valid, non-null DateFormat object set to the current locale What outputs the current locales country name and the appropriate version of d’s date?

  1. Locale loc = Locale.getLocale();System.out.println(loc.getDisplayCountry()+ “ “+ df.format(d));

  2. Locale loc = Locale.getDefault();System.out.println(loc.getDisplayCountry()+ “ “ + df.format(d));

  3. Locale bc = Locale.getLocale();System.out.println(loc.getDisplayCountry()+ “ “+ df.setDateFormat(d));

  4. Locale loc = Locale.getDefault();System.out.println(loc.getDispbayCountry()+ “ “+ df.setDateFormat(d));


Correct Option: B

Which of the following represent legal flow control statements? (A) break; (B) break(); (C) continue outer; (D) continue(inner); (E) return; (F) exit();

  1. (A), (B) & (C)

  2. (A), (C) & (E)

  3. (A), (C) & (D)

  4. (A) & (E)

  5. (C) & (E)


Correct Option: B

Given the declarations boolean b; short x1 = 100, x2 = 200, x3 = 300; Which of the following statements are evaluated to true? (A) b = x1 * 2 == x2; (B) b = x1 + x2 != 3 * x1; (C) b = (x3 - 2*x2<0) || ((x3 = 400)<2*x2); (D) b = (x3 - 2*x2>0) || ((x3 = 400) 2x2);

  1. (A), (B) & (C)

  2. (A), (C) & (D)

  3. (B) & (C)

  4. (A) & (C)

  5. (A) & (D)


Correct Option: D

In the code below, what data types the variable x can have? byte b1 = 5; byte b2 = 10; x = b1 * b2;(A) byte (B) int (C) short (D) long (E) float (F) double

  1. (A), (B), (D) & (E)

  2. (B), (C) & (D)

  3. (B), (D), (E) & (F)

  4. (B), (D) & (E)

  5. (D) & (F)


Correct Option: C

Consider the following code: int x, y, z; y = 1; z = 5; x = 0 - (++y) + z++; After execution of this, what will be the values of x, y and z?

  1. x = 4, y = 1, z = 5

  2. x = 3, y = 2, z = 6

  3. x = -7, y = 1, z = 5

  4. x = 4, y = 2, z = 6


Correct Option: B

"typedefs" used for data types are not machine dependent.

  1. True

  2. False


Correct Option: B

"typedefs" used for data types are not machine dependent.

  1. True

  2. False


Correct Option: B

Why we use "Type Def" in C ?

  1. Modifying existing Data type.

  2. Used for defining type of data type used.

  3. Creating new data type names

  4. Not a valid key word


Correct Option: A

SQL was developed by

  1. Donald D. Chamberlin and Raymond F. Boyce

  2. Donald D. Chamberlin

  3. Raymond F. Boyce

  4. none


Correct Option: A

Amoeba operating system was developed by

  1. Linus Torvalds

  2. Dennis Ritchie

  3. Sun Microsystems

  4. Andrew S. Tanenbaum


Correct Option: D

Commonly used metasyntactic variable names are

  1. Hello and world

  2. Foo and Bar

  3. i and j

  4. int and float


Correct Option: B

Java is a programming language originally developed by

  1. Dennis Ritchie

  2. Edsger Dijkstra

  3. James Gosling

  4. Louis Pasteur


Correct Option: C

class H { public static void main (String[] args) { String s1 = "HHH"; StringBuffer sb2 = new StringBuffer(s1); System.out.print(sb2.equals(s1) + "," + s1.equals(sb2)); }}

  1. Prints: false,false

  2. Prints: true,false

  3. Prints: false,true

  4. Prints: true,true

  5. None of the above


Correct Option: A
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