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Collection Classes problems

  • 1. Which of the following is an ordered collection class?

    1. Map
    2. Stack
    3. Queue
    4. BitArray
    5. HashTable

  • Options
  • A. 1 only
  • B. 2 and 3 only
  • C. 4 and 5 only
  • D. All of the above
  • E. None of the above
    • Discuss
  • 2. A HashTable t maintains a collection of names of states and capital city of each state. Which of the following is the correct way to find out whether "Kerala" state is present in this collection or not?

  • Options
  • A. t.ContainsKey("Kerala");
  • B. t.HasValue("Kerala");
  • C. t.HasKey("Kerala");
  • D. t.ContainsState("Kerala");
  • E. t.ContainsValue("Kerala");
    • Discuss
  • 3. Which of the following is the correct way to access all elements of the Queue collection created using the C#.NET code snippet given below? 

    Queue q = new Queue(); 
q.Enqueue("Sachin"); 
q.Enqueue('A'); 
q.Enqueue(false); 
q.Enqueue(38); 
q.Enqueue(5.4);

  • Options
  • A. 
    IEnumerator e;
e = q.GetEnumerator(); 
while (e.MoveNext())
Console.WriteLine(e.Current);
  • B. 
    IEnumerable e;
e = q.GetEnumerator(); 
while (e.MoveNext()) 
Console.WriteLine(e.Current);
  • C. 
    IEnumerator e;
e = q.GetEnumerable(); 
while (e.MoveNext()) 
Console.WriteLine(e.Current);
  • D. 
    IEnumerator e;
e = Queue.GetEnumerator(); 
while (e.MoveNext()) 
Console.WriteLine(e.Current);
    • Discuss
  • 4. Which of the following is the correct way to access all elements of the Stack collection created using the C#.NET code snippet given below? 

    Stack st = new Stack();
st.Push(11);
st.Push(22);
st.Push(-53);
st.Push(33);
st.Push(66);

  • Options
  • A. 
    IEnumerable e;
e = st.GetEnumerator(); 
while (e.MoveNext())
Console.WriteLine(e.Current);
  • B. 
    IEnumerator e;
e = st.GetEnumerable(); 
while (e.MoveNext())
Console.WriteLine(e.Current);
  • C. 
    IEnumerator e;
e = st.GetEnumerator(); 
while (e.MoveNext()) 
Console.WriteLine(e.Current);
  • D. 
    IEnumerator e;
e = Stack.GetEnumerator(); 
while (e.MoveNext()) 
Console.WriteLine(e.Current);
    • Discuss
  • 5. In a HashTable Key cannot be null, but Value can be.

  • Options
  • A. True
  • B. False
    • Discuss
  • 6. How many enumerators will exist if four threads are simultaneously working on an ArrayList object?

  • Options
  • A. 1
  • B. 3
  • C. 2
  • D. 4
  • E. Depends upon the Project Setting made in Visual Studio.NET.
    • Discuss

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Engineering

Programming

Reasoning

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