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 Collection Framework  Interview In Java?

Q1) What is Iterable Interface In Java?

Q2) What is the difference between Collections and Collection?

Q3) Which is faster to access ArrayList or LinkedList?

Q4) Which is faster ArrayList or Vector?

Q5) How to create Synchronized ArrayList?

Q6) What is hashCode() in Java, how to get the hashcode of Object?

Q7) Difference between Iterator and ListIterator?

Q8)  What is Comparable and Comparator Interface in Java?

Q9)  What is the difference between Hashtable and HashMap?

Q10)  Difference between LIST and Set?

Q11)  What is the difference between Set and MAP?

Q12)  What is Queue Interface In java?

Q13)  What is Priority Queue and Abstract Queue in Java?


                        













12 Comments

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  1. Q1) What is Iterable Interface In Java?
    Ans:- It is the base interface of all Collection Interfaces of Java.

    ReplyDelete
  2. Q2) What is the difference between Collections and Collection?
    Ans:-
    1) The Collection is an interface whereas Collections is a class.
    2) The Collection interface provides the standard functionality of data structure to
    List, Set, and Queue. However, Collections class is to sort and synchronize the
    collection elements.
    3) The Collection interface provides the methods that can be used for data structure w
    Whereas Collections class provides the static methods which can be used for various
    operation on a collection.

    ReplyDelete
  3. Q3) Which is faster to access ArrayList or LinkedList?
    Ans:-
    ArrayList is Faster than LinkedList if

    ReplyDelete
  4. Q4) Which is faster ArrayList or Vector?
    Ans:-
    ArrayList is Faster Since it is non-Synchronized While Vector Operation Give Slower Performance Since They are Synchronized (Thread-safe)..

    ReplyDelete
  5. Q5) How to create Synchronized ArrayList?
    Ans:_
    We can Use Collection.SynchronizedList(List) Method to Synchronize collection in java
    The SynchronizedList(List) method is Used to return a Synchronizes (Thread-safe) List backed By the Specified List.

    import java.util.*;
    public class SyncronizeArrayList {
    public static void main(String args[]) {

    List fruitList = new ArrayList();

    fruitList.add("Mango");
    fruitList.add("Banana");
    fruitList.add("Apple");
    fruitList.add("Strawberry");
    fruitList.add("Pineapple");

    furitList = Collections.synchronizedList(fruitList);

    synchronized (fruitList) {
    Iterator itr = fruitList.iterator();
    while (itr.hasNext()) {
    System.out.println(itr.next());
    }
    }
    }
    }

    ReplyDelete
  6. Q6) Difference between Iterator and ListIterator?
    Ans:-
    Iterator:-
    1) The Iterator traverses the elements in the forward direction only.
    2)The Iterator can be used in List, Set, and Queue.
    3)The Iterator can only perform remove operation while traversing the collection.

    ListIterator:-
    !)ListIterator traverses the elements in backward and forward directions
    both.
    2) ListIterator can be used in List only.
    3) ListIterator can perform ?add,? ?remove,? and ?set? operation while
    traversing the collection.

    ReplyDelete
  7. Q:6) What is Comparable and Comparator Interface in Java?
    Ans;-
    Comparator:-
    this interface is used to compare two different objects .by default TreeSet
    using Comparator interface compare() to compare internal data.

    The comparator provides flexibility to collection objects because we can
    compare the data using different attributes to separate class for comparison.


    Comparable interface:-

    it provides a compareTo method which should be implemented into the actual class, we
    can pass only one parameter for comparison.

    ReplyDelete
  8. Q9) What is the difference between Hashtable and HashMap?
    Ans;-
    HashMap:-
    1)HashMap is not synchronized.
    2)HashMap can contain one null key and multiple null values
    3)HashMap is not ?thread-safe,? so it is useful for non-threaded
    applications.
    4) HashMap inherits the AbstractMap class

    Hashtable:-
    1)Hashtable is synchronized.
    2)Hashtable cannot contain any null key or null value.
    3)Hashtable is thread-safe, and it can be shared between various
    threads.
    4) Hashtable inherits the Dictionary class.

    ReplyDelete
  9. Q10) Difference between LIST and Set?
    Ans:-
    List,Set:-
    1)The List can contain duplicate elements whereas Set includes unique
    items.

    2)The List is an ordered collection which maintains the insertion order
    whereas Set is an unordered collection which does not preserve the insertion
    order.

    3)The List interface contains a single legacy class which is Vector class
    whereas Set interface does not have any legacy class.

    4)The List interface can allow n number of null values whereas Set interface
    only allows a single null value.

    ReplyDelete
  10. Q11) What is the difference between Set and MAP?
    Ans;-
    Set and MAP:-
    1)Set contains values only whereas Map contains key and values both.

    2}Set contains unique values whereas Map can contain unique Keys with
    duplicate values.

    3)Set holds a single number of null value whereas Map can include a single
    null key with n number of null values.

    ReplyDelete
  11. Q12) What is Queue Interface In java?
    Ans:-
    Queue interface: Queue interface defines queue data structure,
    which stores the elements in the form FIFO (first in first out).

    ReplyDelete
  12. Q13) What is Priority Queue and Abstract Queue in Java?

    PriorityQueue class:-
    The PriorityQueue class provides the facility of using
    queue. But it does not orders the elements in FIFO manner.
    It inherits AbstractQueue class.

    Abstract Queue :-
    The AbstractQueue class in Java is a part of the Java Collection
    Framework and implements the Collection interface and the
    AbstractCollection class. It provides skeletal implementations of some
    Queue operations. The implementations in this class are appropriate
    when the base implementation does not allow null elements.

    ReplyDelete

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