Why Should we use collection frame even though we have an array to store group of objects?

 It is possible to store a group of  onjects into an array

Let us take an example where we want to store 100 object of employee class into an array.


Employee arr[]=new Employee[100];
For(int i=0; i<100;i++)
{
            Arr[i]=new Employee(data);
}

So, here we can observe that how can we store group of object into an array and retrieve them easily. But we have some inconveniences by using this mechanism, they are as follows

We cannot store different objects into the same array, because we knows that an array can store one data type of elements.

 Adding the objects at the end of an array is easy, but inserting and deleting the elements in the middle of an array is very difficult/complicated.

 Retrieving elements from an array is easy  but after retrieving the elements, if we want to process them, then there is no methods available to carry out this.
Due to have of above problems, programmers  want a better mechanism to store a group of objects. That mechanism is collection framework to handle group of objects of different type.