Describe the exception scenarios when inserting or deleting elements from an empty queue.

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Aryan Kumar · Answer

Sure. Here are the exception scenarios when inserting or deleting elements from an empty queue:

Queue underflow: This occurs when you try to delete an element from an empty queue. This can happen if the queue has never been initialized or if all of the elements have been deleted from the queue.
Queue overflow: This occurs when you try to insert an element into a full queue. This can happen if the queue has a fixed capacity and the capacity has been reached.

To avoid these exceptions, it is important to check the state of the queue before inserting or deleting elements. For example, you could use the isEmpty() method to check if the queue is empty and the isFull() method to check if the queue is full.

Here are some specific examples of how these exceptions can occur:

Trying to delete an element from an empty queue:

Queue<Integer> queue = new Queue<>();

// This will throw a QueueUnderflowException because the queue is empty.
queue.dequeue();

Trying to insert an element into a full queue:

Queue<Integer> queue = new Queue<>();
queue.add(1);
queue.add(2);
queue.add(3);

// This will throw a QueueOverflowException because the queue is full.
queue.add(4);

To avoid these exceptions, you can use the isEmpty() and isFull() methods to check the state of the queue before inserting or deleting elements. For example:

Queue<Integer> queue = new Queue<>();

if (!queue.isEmpty()) {
  queue.dequeue();
}

if (!queue.isFull()) {
  queue.add(1);
}

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Describe the exception scenarios when inserting or deleting elements from an empty queue.

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