Answer
See the explanation
Work Step by Step
To modify Figure 8.27 and the StackType interface to define a queue instead of a stack, you can rename the class and interface accordingly and change the method names to reflect queue operations. Here's how you can do it:
```java
// Modified Figure 8.27 to define a queue
public class QueueType implements QueueInterface {
private final int MAX_QUEUE_SIZE = 50; // Maximum queue size
private T[] elements; // Array to hold the queue elements
private int front; // Index of the front element
private int rear; // Index of the rear element
private int count; // Number of elements in the queue
// Constructor
public QueueType() {
elements = (T[]) new Object[MAX_QUEUE_SIZE];
front = 0;
rear = MAX_QUEUE_SIZE - 1;
count = 0;
}
// Other methods as per the QueueInterface definition
// Implement enqueue, dequeue, etc.
}
// Modified StackType interface to QueueType interface
public interface QueueInterface {
void enqueue(T element); // Add an element to the rear of the queue
T dequeue(); // Remove and return the element at the front of the queue
boolean isFull(); // Check if the queue is full
boolean isEmpty(); // Check if the queue is empty
}
```
In this modification, the class `QueueType` implements the `QueueInterface`, defining queue operations such as `enqueue`, `dequeue`, `isFull`, and `isEmpty`. The interface `QueueInterface` now declares methods appropriate for queue operations.
