Exercise: Collection Classes

Questions for: Collection Classes

Which of the following statements are correct about the Collection Classes available in Framework Class Library?
A:
Elements of a collection cannot be transmitted over a network.
B:
Elements stored in a collection can be retrieved but cannot be modified.
C:
It is not easy to adopt the existing Collection classes for newtype of objects.
D:
Elements stored in a collection can be modified only if allelements are of similar types.
Answer: E
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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);
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);
Answer: C
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Which of the following statements are correct about a HashTable collection?
  1. It is a keyed collection.
  2. It is a ordered collection.
  3. It is an indexed collection.
  4. It implements a IDictionaryEnumerator interface in its inner class.
  5. The key - value pairs present in a HashTable can be accessed using the Keys and Values properties of the inner class that implements the IDictionaryEnumerator interface.
A:
1 and 2 only
B:
1, 2 and 3 only
C:
4 and 5 only
D:
1, 4 and 5 only
Answer: D
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Which of the following is the correct way to find out the number of elements currently present in an ArrayList Collection called arr?
A:
arr.Count
B:
arr.GrowSize
C:
arr.MaxIndex
D:
arr.Capacity
Answer: A
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Which of the following is an ordered collection class?
  1. Map
  2. Stack
  3. Queue
  4. BitArray
  5. HashTable
A:
1 only
B:
2 and 3 only
C:
4 and 5 only
D:
All of the above
Answer: B
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