Structures/src/Queue/Queue.java at master · njse22/Structures · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
package Queue;

public class Queue <T> implements IQueue<T> {

	private NodeQueue<T> front;
	private NodeQueue<T> apunter;

	private int size;

	public Queue() {
		this.front = null;
		this.size = 0;

	}

	@Override
	public void enQueue(T newElement) {
		NodeQueue<T> n = new NodeQueue<T>(newElement);
		if(size == 0) {
			front = n;
			apunter = front;
			size++;
		}
		else {
			apunter.setLast(n);
			apunter = apunter.getLast();
			size++;

		}

	}

	@Override
	public void deQueue() {
		if(size == 0) {
			new QueueIsEmptyException("Queue is Empty");
		}
		else if(size == 1) {
			front = null;
			size--;
		}
		else {
			NodeQueue<T> temp = front.getLast();
			temp.setNext(null);
			front.setLast(null);
			front = temp;
			size--;

		}

	}

	@Override
	public NodeQueue<T> getFront() {
		return this.front;

	}

	@Override
	public int getSize() {
		return this.size;

	}

	@Override
	public boolean isEmpty() {
		if(size == 0)
			return true;
		else
			return false;

	}


}