Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
Draw a UML class diagram for the following code:
public class ArrayQueue<T> {
private Object[] array;
private int front;
private int rear;
private int size;
public ArrayQueue(int capacity) {
array = new Object[capacity];
front = 0;
rear = -1;
size = 0;
}
public boolean isEmpty() {
return size == 0;
}
public void enqueue(T item) {
if (size == array.length) {
throw new IllegalStateException("Queue is full");
}
rear = (rear + 1) % array.length;
array[rear] = item;
size++;
}
public T dequeue() {
if (isEmpty()) {
throw new IllegalStateException("Queue is empty");
}
T item = (T) array[front];
array[front] = null;
front = (front + 1) % array.length;
size--;
return item;
}
public void dequeueAll() {
while (!isEmpty()) {
dequeue();
}
}
public T peek() {
if (isEmpty()) {
throw new IllegalStateException("Queue is empty");
}
return (T) array[front];
}
public static void main(String[] args) {
ArrayQueue<Integer> queue = new ArrayQueue<>(5);
System.out.println("Is Queue Empty? " + queue.isEmpty());
queue.enqueue(10);
queue.enqueue(20);
queue.enqueue(30);
System.out.println("Front item: " + queue.peek());
System.out.println("Dequeuing: " + queue.dequeue());
System.out.println("Dequeuing: " + queue.dequeue());
System.out.println("Is Queue Empty? " + queue.isEmpty());
queue.enqueue(40);
queue.enqueue(50);
System.out.println("Dequeuing all:");
queue.dequeueAll();
System.out.println("Is Queue Empty? " + queue.isEmpty());
}
}
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